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1.
Braz. j. biol ; 84: e253497, 2024. tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1355892

RESUMO

Abstract This research aimed to estimate the length-weight ratio (LWR) of the stingray Potamotrygon wallacei, known locally as the cururu, which was caught in streams and lakes in the middle Negro River region, Amazonas, Brazil. The stingrays were captured during the night (from 11 pm to 1 am) near the shores of streams and lakes, through active search using wooden canoes, head lanterns and scoop nets. The samplings were carried out in November 2017 (5 days), February (8 days), March (3 days) and April (2 days) of 2018, totaling 18 days of sampling. The total fresh weight was measured to 0.1 g of accuracy and the disc width to 0.1 cm accuracy. The parameters a and b of the equation W=a.DWb were estimated. This study provides new maximum length data for the cururu stingray.


Resumo Esta pesquisa teve como objetivo estimar a relação peso-comprimento (LWR) da arraia Potamotrygon wallacei, conhecida localmente como cururu, que foi capturada em igarapés e lagos na região do médio Rio Negro, Amazonas, Brasil. As arraias foram capturadas durante a noite (das 23h-1h) nas margens dos igarapés e lagos, por meio de busca ativa utilizando canoas de madeira, lanternas de cabeça e puçás. As coletas foram realizadas nos meses de novembro de 2017 (5 dias), fevereiro (8 dias), março (3 dias) e abril (2 dias) de 2018, totalizando 18 dias de amostragem. Foram medidos o peso fresco total com precisão de 0,01 g e a largura do disco com precisão de 0,1 cm. Os parâmetros a e b da equação W= a.DWb foram estimados. Este estudo prover novos dados de comprimento máximo para a arraia cururu.


Assuntos
Humanos , Animais , Rajidae , Rosa , Afro-Americanos , Brasil , Rios
3.
An Acad Bras Cienc ; 94(suppl 4): e20220045, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35894302

RESUMO

Elasmobranchs are long-lived predatory fish that show high Hg concentrations generally reflecting environmental levels, notwithstanding they are widely consumed in Brazil increasing Hg exposure to humans. This study reports on Hg concentrations in largely consumed sharks (Rhizoprionodon porosus) and rays (Hypanus guttatus) from the Pernambuco coast, NE Brazil and the risk associated with their consumption. Muscle tissue concentrations of Hg in H. guttatus and R. porosus varied from 40 to 1,020 ng.g-1 w.w. (median = 125; mean = 124 ± 48 ng.g-1 w.w.) in sharks and from 129 to 2,130 ng.g-1 w.w. (median = 976; mean = 919 ± 139 ng.g-1 w.w.) in rays. Concentrations of Hg positively correlated with size in sharks, but not in rays. Concentrations reflect the local environmental contamination of a large urban center and industrial park concentrated in a short extension of mangrove-dominated coastline (50 km) and are higher compared to other Brazilian sites where Hg concentrations in these species have been reported. Sharks had a risk coefficient (HQ) range of 0.04 to 1.1, not surpassing the reference level of exposure. On the other hand, rays' HQ ranged from 0.14 to 2.3, and exceeds the reference level of exposure and suggests adverse effects to consumers.


Assuntos
Mercúrio , Tubarões , Rajidae , Poluentes Químicos da Água , Animais , Brasil , Monitoramento Ambiental , Peixes , Humanos , Mercúrio/análise , Poluentes Químicos da Água/análise
4.
J Parasitol ; 108(3): 238-244, 2022 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-35687320

RESUMO

Peruanocotyle pelagica n. sp. is described based on specimens collected from the wall of the pharyngeal cavity of the Pacific cownose ray Rhinoptera steindachneri offshore Oaxaca and Guerrero, Mexico. The new species is distinguished from Peruanocotyle chisholmae by its anchors, which include a slender guard that curves towards the tip of the blade and which lack an accessory piece, morphological differences of the seminal vesicle, the lack of a male copulatory organ accessory piece and a greater number of spines, and an unsclerotized vagina. Molecular data of Peruanocotyle pelagica were generated to place the phylogenetic position of the genus within Monocotylidae.


Assuntos
Acantocéfalos , Elasmobrânquios , Parasitos , Rajidae , Trematódeos , Animais , Feminino , Masculino , México/epidemiologia , Oceano Pacífico , Filogenia , Rajidae/parasitologia
5.
Development ; 149(13)2022 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-35762641

RESUMO

The pseudobranch is a gill-like epithelial elaboration that sits behind the jaw of most fishes. This structure was classically regarded as a vestige of the ancestral gill arch-like condition of the gnathostome jaw. However, more recently, hypotheses of jaw evolution by transformation of a gill arch have been challenged, and the pseudobranch has alternatively been considered a specialised derivative of the second (hyoid) pharyngeal arch. Here, we demonstrate in the skate (Leucoraja erinacea) that the pseudobranch does, in fact, derive from the mandibular arch, and that it shares gene expression features and cell types with gills. We also show that the skate mandibular arch pseudobranch is supported by a spiracular cartilage that is patterned by a shh-expressing epithelial signalling centre. This closely parallels the condition seen in the gill arches, where cartilaginous appendages called branchial rays, which support the respiratory lamellae of the gills, are patterned by a shh-expressing gill arch epithelial ridge. Together with similar discoveries in zebrafish, our findings support serial homology of the pseudobranch and gills, and an ancestral origin of gill arch-like anatomical features from the gnathostome mandibular arch.


Assuntos
Brânquias , Rajidae , Animais , Região Branquial/metabolismo , Brânquias/metabolismo , Arcada Osseodentária , Rajidae/genética , Peixe-Zebra
6.
Mar Pollut Bull ; 179: 113672, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35512518

RESUMO

Total mercury (THg) concentrations were measured in muscle and liver of two placental viviparous sharks, the Pacific sharpnose shark (Rhizoprionodon longurio) and the brown smooth-hound (Mustelus henlei); as well as in the muscle, liver, and yolk of the yolk-sac viviparous speckled guitarfish (Pseudobatos glaucostigmus) in Baja California Sur. The aim was to determine which factors could be involved in maternal transfer and resultant maternal and embryonic THg concentration. Higher THg concentrations were found in pregnant females compared to embryos paired tissues. THg concentrations of embryo tissues decreased with total length (TL), except for the muscle of the Pacific sharpnose shark. THg concentrations of embryo muscle was positively related to THg concentration in the muscle of pregnant females. Embryos TL, muscle THg concentration of pregnant females, percentage of THg concentration in embryos, along with the reproductive strategy are relevant factors required to improve our understanding of THg concentration in embryo tissues.


Assuntos
Mercúrio , Tubarões , Rajidae , Animais , Feminino , Mercúrio/análise , México , Placenta/química , Gravidez
7.
J Fish Biol ; 101(1): 213-225, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35575221

RESUMO

Manta and devil rays (collectively mobulids) belong to the monogeneric Mobulidae, which currently comprises 10 species, including a putative third manta ray species (Mobula cf. birostris). These large planktivorous rays are distributed throughout the tropical and subtropical oceans of the world. To date, six mobulid species are reported for the western Atlantic Ocean and the Caribbean Sea, three of which had previously been reported in Venezuela (Mobula birostris, Mobula tarapacana and Mobula hypostoma). A preliminary assessment of fishery landings and citizen science data was conducted to further the scientific knowledge of mobulid species in Venezuela. Fisheries landing data were collected at Margarita Island between 2006 and 2007, and again in 2014. Data mining of internet search engines and social media platforms spanning the past two decades was also conducted. A total of 117 individuals of five mobulid species were recorded: Mobula sp. (n = 27), M. birostris (n = 36), M. tarapacana (n = 3), Mobula mobular (n = 26), Mobula thurstoni (n = 14) and M. cf. birostris (n = 11). The latter three species are the first confirmation of these species in Venezuela. The authors found no records of the previously reported M. hypostoma during this study. Although the occurrence of M. hypostoma in Venezuela remains possible because of the broad regional range of this species, its current presence in Venezuela is invalidated given the repeated misidentifications which have occurred in previous publications. The results of this study increase the number of reported mobulid ray species in Venezuela to five (excluding M. hypostoma). The overall data from juvenile manta rays and pregnant M. mobular and M. thurstoni recorded in this study, combined with the occurrence of all but one species of mobulid ray found in the western Atlantic Ocean, suggest Venezuela provides important habitat for this threatened family of rays.


Assuntos
Distribuição Animal , Ciência do Cidadão , Rajidae , Animais , Pesqueiros/estatística & dados numéricos , Humanos , Oceanos e Mares , Rajidae/fisiologia , Venezuela
8.
Sci Rep ; 12(1): 3894, 2022 03 31.
Artigo em Inglês | MEDLINE | ID: mdl-35361791

RESUMO

The numerical understanding of cichlids and stingrays was examined regarding addition and subtraction abilities within the number space of one to five. Experiments were conducted as two-alternative forced-choice experiments, using a delayed matching to sample technique. On each trial, fish had to perform either an addition or subtraction, based on the presentation of two-dimensional objects in two distinct colors, with the color signaling a particular arithmetic process. Six cichlids and four stingrays successfully completed training and recognized specific colors as symbols for addition and subtraction. Cichlids needed more sessions than stingrays to reach the learning criterion. Transfer tests showed that learning was independent of straightforward symbol memorization. Individuals did not just learn to pick the highest or lowest number presented based on the respective color; instead, learning was specific to adding or subtracting 'one'. Although group results were significant for both species in all tests, individual results varied. Addition was learned more easily than subtraction by both species. While cichlids learned faster than stingrays, and more cichlids than stingrays learned the task, individual performance of stingrays exceeded that of cichlids. Previous studies have provided ample evidence that fish have numerical abilities on par with those of other vertebrate and invertebrate species tested, a result that is further supported by the findings of the current study.


Assuntos
Ciclídeos , Rajidae , Animais , Aprendizagem , Matemática
9.
Sci Rep ; 12(1): 6544, 2022 04 21.
Artigo em Inglês | MEDLINE | ID: mdl-35449381

RESUMO

In 2018, the giant manta ray was listed as threatened under the U.S. Endangered Species Act. We integrated decades of sightings and survey effort data from multiple sources in a comprehensive species distribution modeling (SDM) framework to evaluate the distribution of giant manta rays off the eastern United States, including the Gulf of Mexico. Manta rays were most commonly detected at productive nearshore and shelf-edge upwelling zones at surface thermal frontal boundaries within a temperature range of approximately 20-30 °C. SDMs predicted highest nearshore occurrence off northeastern Florida during April, with the distribution extending northward along the shelf-edge as temperatures warm, leading to higher occurrences north of Cape Hatteras, North Carolina from June to October, and then south of Savannah, Georgia from November to March as temperatures cool. In the Gulf of Mexico, the highest nearshore occurrence was predicted around the Mississippi River delta from April to June and again from October to November. SDM predictions will allow resource managers to more effectively protect manta rays from fisheries bycatch, boat strikes, oil and gas activities, contaminants and pollutants, and other threats.


Assuntos
Elasmobrânquios , Rajidae , Animais , Oceano Atlântico , Espécies em Perigo de Extinção , Pesqueiros , Georgia , Estados Unidos
10.
Prehosp Disaster Med ; 37(3): 350-354, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35392997

RESUMO

INTRODUCTION: Stingray envenomation is a marine injury suffered by ocean goers throughout the world. No prospective studies exist on the various outcomes associated with these injuries. STUDY OBJECTIVE: The aim of this study was to perform a prospective, observational study of human stingray injuries to determine the natural history, acute and subacute complications, prevalence of medical evaluation, and categories of medical treatment. METHODS: This study prospectively studied a population of subjects who were injured by stingrays at Seal Beach, California (USA) from July 2012 through September 2016 and did not immediately seek emergency department evaluation. Subjects described their initial injury and provided information on their symptoms, medical evaluations, and medical treatment for the injury at one week and one month after the injury. This information was reported as descriptive statistics. RESULTS: A total of 393 participants were enrolled in the study; 313 (80%) of those completed the one-week follow-up interview and 279 (71%) participants completed both the one-week and one-month follow-up interviews. Overall, 234 (75%) injuries occurred to the foot. One hundred sixty-three (52%) patients had complete resolution of their pain within one week and 261 (94%) had either complete resolution or improvement of pain by one month. Sixty-eight (22%) subjects reported being evaluated by a physician and a total of 49 (17%) subjects reported antibiotic treatment for their wound. None of the subjects required parenteral antibiotics or hospital admission. CONCLUSION: The majority of stingray victims recover from stingray injury without requiring antibiotics. A subset of subjects will have on-going wound pain after one month. The need for parenteral antibiotics or hospital admission is rare.


Assuntos
Mordeduras e Picadas , Rajidae , Animais , Antibacterianos , Mordeduras e Picadas/complicações , Mordeduras e Picadas/epidemiologia , Mordeduras e Picadas/terapia , Humanos , Dor , Estudos Prospectivos
11.
J Fish Biol ; 101(1): 302-307, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35475478

RESUMO

The giant freshwater whipray Urogymnus polylepis is a threatened species that is vulnerable to riverine and coastal marine pressures. Despite its threatened status, the range of U. polylepis is still being determined. In this study, photographic evidence of U. polylepis in Myanmar was provided through market surveys (2017-2018) and social media (Sharks and Rays of Rakhine Facebook page, 2021). Urogymnus polylepis is exposed to fisheries and habitat degradation pressures in Myanmar; therefore, conservation management is likely needed to ensure populations persist into the future.


Assuntos
Tubarões , Rajidae , Mídias Sociais , Animais , Conservação dos Recursos Naturais , Ecossistema , Espécies em Perigo de Extinção , Água Doce , Mianmar
12.
J Anat ; 241(2): 372-392, 2022 08.
Artigo em Inglês | MEDLINE | ID: mdl-35428996

RESUMO

The lifelong tooth replacement in elasmobranch fishes (sharks, rays and skates) has led to the assemblage of a great number of teeth from fossil and extant species, rendering tooth morphology an important character for taxonomic descriptions, analysing phylogenetic interrelationships and deciphering their evolutionary history (e.g. origination, divergence, extinction). Heterodonty (exhibition of different tooth morphologies) occurs in most elasmobranch species and has proven to be one of the main challenges for these analyses. Although numerous shark species are discovered and described every year, detailed descriptions of tooth morphologies and heterodonty patterns are lacking or are only insufficiently known for most species. Here, we use landmark-based 2D geometric morphometrics on teeth of the tiger shark Galeocerdo cuvier to analyse and describe dental heterodonties among four different ontogenetic stages ranging from embryo to adult. Our results reveal rather gradual and subtle ontogenetic shape changes, mostly characterized by increasing size and complexity of the teeth. We furthermore provide the first comprehensive description of embryonic dental morphologies in tiger sharks. Also, tooth shapes of tiger sharks in different ontogenetic stages are re-assessed and depicted in detail. Finally, multiple cases of tooth file reversal are described. This study, therefore, contributes to our knowledge of dental traits across ontogeny in the extant tiger shark G. cuvier and provides a baseline for further morphological and genetic studies on the dental variation in sharks. Therefore, it has the potential to assist elucidating the underlying developmental and evolutionary processes behind the vast dental diversity observed in elasmobranch fishes today and in deep time.


Assuntos
Tubarões , Rajidae , Animais , Dentição , Fósseis , Filogenia , Tubarões/anatomia & histologia
13.
Rev Cardiovasc Med ; 23(3): 113, 2022 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-35345280

RESUMO

BACKGROUND: The feasibility and long-term outcomes of the CrossBoss/Stingray for treating coronary chronic total occlusions (CTO) with distal diffuse disease landing zone remain unclear. METHODS: Consecutive CTO patients with distal diffuse lesions that underwent percutaneous coronary intervention by the CrossBoss/Stingray system at Xijing Hospital from April 2016 to October 2020, were included. Patients were analyzed by two groups according to the extent of stenosis in the distal landing zone: 50%-70% stenosis (moderate stenosis group) and >70% stenosis (severe stenosis group). The primary efficacy outcome was technical success, defined as the frequency of true lumen guidewire placement distal to the CTO. The composite endpoint of all-cause death, any stroke, or any revascularization was also explored. RESULTS: A total of 91 consecutive patients were included, with 32 patients in the moderate stenosis group and 59 patients in the severe stenosis group. The mean J-CTO score was 2.5 ± 1.1. The technical success rate was 79.1% (72/91) in the overall population and was similar between the 2 groups: 78.1% (25/32) and 79.7% (47/59) (p = 0.608). No coronary perforation occurred. With a median follow-up of 29 months (IQR: 53-92), the estimated rate of the composite endpoint of all-cause death, any stroke, or any revascularization was 50.4% (all-cause death: 16.6%, any stroke: 1.1%, any revascularization: 36.5%) in the overall population. No significant difference was observed in the rate of the composite endpoint between the moderate stenosis group and the severe stenosis group (45.1% vs. 54.3%, respectively, p = 0.797). CONCLUSIONS: In CTO lesions with distal diffuse disease landing zone, the technical success rates of CrossBoss/Stingray and the long-term clinical outcomes were not significantly different between the moderate stenosis group (50%-70%) and the severe stenosis group (>70%). However, the relatively high rate of long-term clinical outcomes, especially any revascularization, warrants further investigations on this indication in future studies.


Assuntos
Oclusão Coronária , Intervenção Coronária Percutânea , Rajidae , Acidente Vascular Cerebral , Animais , Doença Crônica , Constrição Patológica/etiologia , Angiografia Coronária , Oclusão Coronária/diagnóstico por imagem , Oclusão Coronária/terapia , Estudos de Viabilidade , Humanos , Intervenção Coronária Percutânea/efeitos adversos , Resultado do Tratamento
14.
J Zoo Wildl Med ; 53(1): 153-158, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-35339160

RESUMO

Elasmobranchs are popular display animals in public aquaria and zoos, but medical management gaps remain in the understanding of the pharmacokinetics of analgesics and pain management in these species. Meloxicam is a nonsteroidal anti-inflammatory drug that has been evaluated intravenously and intramuscularly in teleosts, but has yet to be studied in any elasmobranch species. The pharmacokinetics of meloxicam were determined in 17 yellow stingrays (Urobatis jamaicensis). All stingrays were determined to be healthy from complete physical examinations and baseline bloodwork performed prior to study inclusion. A single dose of 1 mg/kg meloxicam intramuscularly was administered to all rays, followed by a 2 mg/kg oral dose after an 8 wk washout period. Blood samples were collected from the mesopterygial vein at baseline and nine time points up to 96 h after administration of meloxicam. Plasma concentrations were determined using reversed-phase high-performance liquid chromatography. Pharmacokinetic analysis was performed using a noncompartmental technique. The mean peak plasma concentrations for intramuscular and oral meloxicam were 1.29 and 0.42 µg/ml, respectively. The mean terminal half-lives of meloxicam after intramuscular and oral administration were 5.75 and 15.46 h, respectively. Based on these findings, the recommended meloxicam dosage and frequency for yellow stingrays is 2 mg/kg orally once daily. Due to rapid elimination with the intramuscular administration, maintaining clinically relevant plasma concentrations may be difficult using this route. Further studies are needed to determine multidose pharmacokinetics of meloxicam in yellow stingrays, as well as single-dose and multidose pharmacokinetics in other elasmobranch species.


Assuntos
Rajidae , Tiazinas , Animais , Área Sob a Curva , Meia-Vida , Meloxicam , Tiazóis
15.
Curr Top Dev Biol ; 147: 595-630, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35337464

RESUMO

The vast majority of extant vertebrate diversity lies within the bony and cartilaginous fish lineages of jawed vertebrates. There is a long history of elegant experimental investigation of development in bony vertebrate model systems (e.g., mouse, chick, frog and zebrafish). However, studies on the development of cartilaginous fishes (sharks, skates and rays) have, until recently, been largely descriptive, owing to the challenges of embryonic manipulation and culture in this group. This, in turn, has hindered understanding of the evolution of developmental mechanisms within cartilaginous fishes and, more broadly, within jawed vertebrates. The little skate (Leucoraja erinacea) is an oviparous cartilaginous fish and has emerged as a powerful and experimentally tractable developmental model system. Here, we discuss the collection, husbandry and management of little skate brood stock and eggs, and we present an overview of key stages of skate embryonic development. We also discuss methods for the manipulation and culture of skate embryos and illustrate the range of tools and approaches available for studying this system. Finally, we summarize a selection of recent studies on skate development that highlight the utility of this system for inferring ancestral anatomical and developmental conditions for jawed vertebrates, as well as unique aspects of cartilaginous fish biology.


Assuntos
Tubarões , Rajidae , Animais , Desenvolvimento Embrionário , Arcada Osseodentária , Camundongos , Peixe-Zebra
16.
Artigo em Inglês | MEDLINE | ID: mdl-35248695

RESUMO

The transport mechanisms for water, ammonia and urea in elasmobranch gill, kidney and gastrointestinal tract remain to be fully elucidated. Aquaporin 8 (AQP8) is a known water, ammonia and urea channel that is expressed in the kidney and respiratory and gastrointestinal tracts of mammals and teleost fish. However, at the initiation of this study in late 2019, there was no copy of an elasmobranch aquaporin 8 gene identified in the genebank even for closely related holocephalon species such as elephant fish (Callorhinchus milii) or for the elasmobranch little skate (Leucoraja erinacea). A transcriptomic study in spiny dogfish (Squalus acanthias) also failed to identify a copy. Hence this study has remedied this and identified the AQP8 cDNA sequence using degenerate PCR. Agarose electrophoresis of degenerate PCR reactions from dogfish tissues showed a strong band from brain cDNA and faint bands of a similar size in gill and liver. 5' and 3' RACE was used to complete the AQP8 cDNA sequence. Primers were then designed for further PCR reactions to determine the distribution of AQP8 mRNA expression in dogfish tissues. This showed that AQP8 is only expressed in dogfish brain and AQP8 therefore clearly can play no role in water, ammonia and urea transport in the gill, kidney or gastrointestinal tract. The role of AQP8 in dogfish brain remains to be determined.


Assuntos
Aquaporinas , Rajidae , Squalus acanthias , Amônia/metabolismo , Animais , Aquaporinas/genética , Encéfalo/metabolismo , DNA Complementar/metabolismo , Cação (Peixe)/genética , Cação (Peixe)/metabolismo , Peixes/metabolismo , Brânquias/metabolismo , Intestinos , Rim/metabolismo , Mamíferos/metabolismo , Rajidae/metabolismo , Squalus acanthias/genética , Squalus acanthias/metabolismo , Ureia/metabolismo , Água/metabolismo
17.
J Parasitol ; 108(2): 166-179, 2022 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-35357506

RESUMO

A study of cestode specimens that were collected during survey work on elasmobranchs collected from Taiwan and Northern Territory, Australia, revealed the presence of 1 new combination into the genus Stillabothrium (Rhinebothriidea: Escherbothriidae) and 2 new species of the genus. Phyllobothrium biacetabulatum, collected from Rhinobatos schlegelii, is transferred to Stillabothrium and its description is emended, as is the diagnosis for the genus Stillabothrium and the family Escherbothriidae. Stillabothrium biacetabulatum n. comb. differs from existing species of the genus in that the face of its bothridia is laced with a network of longitudinal and horizontal muscle fibers that do not contribute to the formation of septa. Stillabothrium lunae n. sp. is described from Himantura leoparda and differs from existing species of the genus in that its bothridium possesses an anterior field of 7-8 loculi that are wider than long. Stillabothrium mariae n. sp. is described from Maculabatis astra. This species differs from all species of Stillabothrium except Stillabothrium campbelli in possessing 10-12 horizontally oriented bothridial loculi. Stillabothrium mariae n. sp. differs from S. campbelli in having longer bothridia and from all other species of Stillabothrium in that it lacks, rather than possesses, conspicuous septa and loculi that are longer than wide in the posterior region of its bothridia. Bayesian and parsimony-bootstrap analysis of 28S rDNA revealed S. biacetabulatum n. comb., S. lunae n. sp., and S. mariae n. sp. to be part of Clade 1 of Stillabothrium, with S. biacetabulatum n. comb. being the sister species to S. mariae n. sp. Stillabothrium lunae n. sp. was found to be the sister species to Stillabothrium borneoense.


Assuntos
Cestoides , Elasmobrânquios , Rajidae , Animais , Teorema de Bayes , Cestoides/genética , Northern Territory/epidemiologia
18.
J Fish Biol ; 100(5): 1315-1318, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35292972

RESUMO

Multiple paternity (MP) is a phenomenon observed for more than 30 elasmobranch species. The Batoidea is more specious than the Selachii, but only three studies of MP have been conducted on batoids. The occurrence of MP in freshwater stingrays was tested using microsatellite markers, which were developed for Potamotrygon leopoldi. Six mothers and their litters were genotyped, providing the first evidence of MP for Potamotrygonidae, with an MP frequency of 33%.


Assuntos
Elasmobrânquios , Rajidae , Animais , Elasmobrânquios/genética , Água Doce , Paternidade , Rios , Rajidae/genética
19.
Travel Med Infect Dis ; 47: 102312, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35304330

RESUMO

BACKGROUND: Injuries sustained following stingray attacks are at high risk of infection and can progress to serious, debilitating consequences for the patient if not appropriately addressed. Antibiotic treatment of such infections is important to minimise the morbidity experienced by patients. However, antibiotic guidelines relating specific to this patient group are not well established. This study aims to report the experience of a single institution at treating stingray associated wound infections and to review the literature for reported cases. Additionally, we review the microbiological risk in these patients and summarise the literature surrounding antibiotic choice. METHODS: A retrospective review of all patients presenting with injuries sustained following stingray attacks was conducted at a single institution. Additionally, a comprehensive literature review was conducted to identify cases of infected stingray associated trauma and review the causative micro-organisms and antibiotics used to treat such infections. RESULTS: 22 cases of stingray injuries were identified from a single institution. Of these, eight infections were reported. One case grew a highly resistant Vibrio species. Among the literature, 18 cases of infections were identified many of which led to significant complications for patients. The micro-organisms identified were diverse and there was little consistency among the antibiotic regimens utilised. CONCLUSION: Based on the antibiotic susceptibilities of causative bacteria along with extrapolation from recommendations and guidelines identified in the literature, ciprofloxacin, doxycycline and trimethoprim-sulfamethoxazole appear to be the most appropriate antibiotics choices for prophylaxis or treatment of localised infection. Antibiotic choices for the empiric treatment of systemic infection requires further research and clarification.


Assuntos
Antibacterianos , Rajidae , Animais , Antibacterianos/efeitos adversos , Antibioticoprofilaxia , Doxiciclina , Farmacorresistência Bacteriana , Humanos , Combinação Trimetoprima e Sulfametoxazol
20.
J Helminthol ; 96: e8, 2022 Feb 02.
Artigo em Inglês | MEDLINE | ID: mdl-35105390

RESUMO

Three new species of 'tetraphyllideans' in the family Serendipeidae are described from cownose rays off Senegal. Duplicibothrium jeannettae n. sp. and Duplicibothrium collosum n. sp. parasitize both Rhinoptera marginata and Rhinoptera peli. Duplicibothrium jillae n. sp. parasitizes R. marginata. Duplicibothrium jeannettae n. sp. and D. jillae n. sp. differ from one another and their described congeners in size, number of proglottids, and locular configuration. The generic assignment of D. collosum n. sp. was initially unclear because its scolex more closely resembles that of Serendip than Duplicibothrium. To help inform generic placement, sequence data were generated for the 28S rDNA gene (D1-D3 region) for the three new species as well as for Duplicibothrium minutum and Duplicibothrium n. sp. 2 from Rhinoptera bonasus off North Carolina, Duplicibothrium n. sp. 3 from Rhinoptera brasiliensis off Belize, Duplicibothrium n. sp. 4 and Duplicibothrium n. sp. 5 from Rhinoptera jayakari off Mozambique, and Duplicibothrium n. sp. 6 from Rhinoptera neglecta off Australia. Comparable data were obtained from GenBank for adults and larvae of Duplicibothrium collected from the Gulf of Mexico. The tree resulting from a maximum likelihood analysis (MLA) placed D. collosum n. sp. robustly within Duplicibothrium; the generic diagnosis is emended accordingly. This raises a question regarding the independence, and thus also validity, of the three genera of the Serendipeidae - a question that must await a molecular analysis that includes Serendip and Glyphobothrium. These results extend the hosts of Duplicibothrium to include R. brasiliensis, R. jayakari, R. marginata, R. neglecta and R. peli, and the distribution to include the western Pacific Ocean, eastern Atlantic Ocean, and western Indian Ocean (Zoobank Registration: 97BB5020-BFFF-4FEA-AE07-B4711D1110FC).


Assuntos
Cestoides , Rajidae , Animais , Cestoides/genética , DNA Ribossômico/genética , Filogenia , Senegal
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