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1.
J Fish Dis ; 34(10): 793-9, 2011 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-21916904

RESUMO

Lepeophtheirus acutus Heegaard, 1943 (Caligidae, Siphonostomatoida, Copepoda), was collected from or observed on four of six elasmobranch species held at Burgers' Zoo (Arnhem, The Netherlands). Circumstantial evidence suggested that a zebra shark, Stegostoma fasciatum (Hermann), from the wild carried the infection into the facility, where copepods reproduced and colonized additional hosts. Copepods typically attached on and about the eyes, in the mouth and occasionally about the cloaca and on the claspers. Severe ocular lesions were associated with infections on zebra sharks, a grey reef shark, Carcharhinus amblyrhynchos (Bleeker), whitetip reef sharks, Triaenodon obesus (Rüppell), and giant shovelnose ray, Rhinobatos typus Bennett, while blacktip reef sharks, Carcharhinus melanopterus (Quoy & Gaimard), and blacktip sharks, Carcharhinus limbatus (Valenciennes), living in infested aquaria showed no sign of infection. Water treatments using trichlorfon were considered primarily responsible for the eradication of copepods from hosts and infested aquaria. This case is the first report of a copepod infection being closely associated with disease and death of an aquarium-held elasmobranch. Given its ability to infect a wide variety of elasmobranchs and promote life-threatening lesions on some hosts, L. acutus should be considered a dangerous pathogen of captive elasmobranchs.


Assuntos
Animais de Zoológico/parasitologia , Copépodes/fisiologia , Elasmobrânquios/parasitologia , Doenças dos Peixes/parasitologia , Doenças Parasitárias em Animais/parasitologia , Dermatopatias Parasitárias/veterinária , Animais , Erradicação de Doenças , Feminino , Doenças dos Peixes/mortalidade , Doenças dos Peixes/patologia , Doenças dos Peixes/transmissão , Masculino , Países Baixos , Doenças Parasitárias em Animais/mortalidade , Doenças Parasitárias em Animais/patologia , Doenças Parasitárias em Animais/transmissão , Dermatopatias Parasitárias/mortalidade , Dermatopatias Parasitárias/parasitologia , Dermatopatias Parasitárias/patologia , Dermatopatias Parasitárias/transmissão
2.
J Fish Biol ; 75(10): 2464-74, 2009 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-20738502

RESUMO

Stable nitrogen (delta(15)N) and carbon (delta(13)C) isotopes of Atlantic sharpnose shark Rhizoprionodon terraenovae embryos and mothers were analysed. Embryos were generally enriched in (15)N in all studied tissue relative to their mothers' tissue, with mean differences between mother and embryo delta(15)N (i.e. Deltadelta(15)N) being 1.4 per thousand for muscle, 1.7 per thousand for liver and 1.1 per thousand for cartilage. Embryo muscle and liver were enriched in (13)C (both Deltadelta(13)C means = 1.5 per thousand) and embryo cartilage was depleted (Deltadelta(13)C mean = -1.01 per thousand) relative to corresponding maternal tissues. While differences in delta(15)N and delta(13)C between mothers and their embryos were significant, muscle delta(15)N values indicated embryos to be within the range of values expected if they occupied a similar trophic position as their respective mothers. Positive linear relationships existed between embryo total length (L(T)) and Deltadelta(15)N for muscle and liver and embryo L(T) and Deltadelta(13)C for muscle, with those associations possibly resulting from physiological differences between smaller and larger embryos or differences associated with the known embryonic nutrition shift (yolk feeding to placental feeding) that occurs during the gestation of this placentatrophic species. Together these results suggest that at birth, the delta(15)N and delta(13)C values of R. terraenovae are likely higher than somewhat older neonates whose postpartum feeding habits have restructured their isotope profiles to reflect their postembryonic diet.


Assuntos
Tubarões/embriologia , Fenômenos Fisiológicos da Nutrição Animal , Animais , Isótopos de Carbono/análise , Cartilagem/química , Feminino , Músculos/química , Isótopos de Nitrogênio/análise
4.
Eur J Pediatr Surg ; 16(5): 343-7, 2006 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-17160780

RESUMO

As part of a postmortem research project 9 beagle femora were dynamically tested by means of three-point bending. The test device was a spring driven impactor with an impact velocity of 3 m/s. Maximum bending force, deflection and force-deflection history were documented. After the impact transverse fractures were observed in 6 specimens, while another 3 specimens showed short oblique fractures. The fractured femora were treated realistically with external fixation (triax monotube) and again loaded on the impactor. After this treatment of the specimens and dynamic loading comminuted fractures occurred. In 7 cases all 4 pins were distorted. While there was only a small difference between the mean bending force of 751.01 N before and 729.54 N after treatment, a significant difference in terms of deflection and bending stiffness showed with p = 0.0039 for both parameters. This experimental result means that in cases of transverse fractures caused by ventral force only 9.6 % of the initial bending stiffness is obtained after stabilization with external fixation. Considering the fact that the use of external fixation protracts the time to bone consolidation of transverse fractures, this method cannot be designed as the therapy of choice.


Assuntos
Fraturas do Fêmur/fisiopatologia , Fraturas do Fêmur/cirurgia , Animais , Cães , Fixadores Externos , Fixação de Fratura , Estresse Mecânico
5.
Oecologia ; 87(2): 219-226, 1991 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28313838

RESUMO

The grey alder compensates leaf area losses due to insect grazing by continuously producing new leaves throughout the vegetative period. Different degrees of defoliation were attained experimentally by a controlled release of the oligophagous beetle Agelastica alni on arbitrarily selected trees from a homogenous population of young alders. The reduction in leaf area per tree significantly influenced the density of leaf trichomes, assessed 10-30 days later, on newly sprouting leaves only. Cross-correlations between leaf area reduction and trichome density were strongest for leaves which completed unfolding 14-21 days after damage. Dualchoice assays suggested a negative influence of trichomes on oviposition rate of A. alni. Removal of trichomes by shaving demonstrated the highly significant effect of trichomes on feeding behavior of adults and larvae in dual-choice assays. The role of the induced increase in trichome density as a possible short-term defense reaction against herbivorous insects is discussed.

6.
Rofo ; 130(4): 465-9, 1979 Apr.
Artigo em Alemão | MEDLINE | ID: mdl-155603

RESUMO

A random selection of lesions representing osteolytic bone processes was evaluated with the "region-of-interest" technique in order to determine whether scintimetry can be helpful in the differential diagnosis of such processes in children. Bone tumours with structural densification, as well as osteomyelitides, were reviewed for comparative purposes. It was found that scintigraphy of the skeleton, while supplying additional and clinically quite interesting information, does not make any substantial contribution to the differential diagnostic clarification of roentgenological translucence in the skeleton of children.


Assuntos
Reabsorção Óssea/diagnóstico por imagem , Osteólise/diagnóstico por imagem , Criança , Condroblastoma/diagnóstico por imagem , Diagnóstico Diferencial , Granuloma Eosinófilo/diagnóstico por imagem , Neoplasias Femorais/diagnóstico por imagem , Fibroma/diagnóstico por imagem , Humanos , Cintilografia , Crânio/diagnóstico por imagem , Tíbia/diagnóstico por imagem , Tomografia Computadorizada por Raios X
7.
Rofo ; 129(6): 757-61, 1978 Dec.
Artigo em Alemão | MEDLINE | ID: mdl-153279

RESUMO

The radiologically demonstrable changes in the skull, which occur in neurofibromatosis, are described. The mesodermal dysplastic changes in the sphenoid and the facial skeleton are diagnostic. Changes secondary to blastomatous processes are not always a consequence of the presence of a tumour; they may result from developmental abnormalities or dural protrusion. In addition one may encounter a series of changes which are not in themselves diagnostic. Problems in the diagnoses and the differential diagnosis are discussed.


Assuntos
Neurofibromatose 1/diagnóstico por imagem , Neoplasias Cranianas/diagnóstico por imagem , Crânio/anormalidades , Criança , Feminino , Humanos , Lactente , Masculino , Pessoa de Meia-Idade , Radiografia , Crânio/diagnóstico por imagem
8.
Vet Parasitol ; 37(3-4): 285-96, 1990 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-2267728

RESUMO

The efficacy of ivermectin delivered by an orally administered prototype sustained-release bolus over approximately 90 days was evaluated against natural infestations of five African tick species. Twenty cattle, allocated by restricted randomization based on counts of standard Boophilus decoloratus, were allocated to two groups and were either given an ivermectin bolus or designated as non-medicated controls. All cattle grazed a single pasture of native grasses for 20-40 days before treatment and until trial termination. Starting on Days 27, 40, 68 and 82 after bolus administration, four replicates were confined to individual tick-collection stanchions for 4 to 5-day periods. Ticks recovered from these cattle were counted by species, sex, and stage and degree of repletion; engorged females were weighed and incubated to determine the number which oviposited. For the other replicates, half-body counts of adult ticks (classified by species, sex and degree of repletion by females) were made at 1- and 2-week intervals through Day 90. Among replicates confined to stanchions periodically, fewer (P less than 0.05) engorged adult female B. decoloratus, Hyalomma spp., Rhipicephalus appendiculatus and Rhipicephalus evertsi evertsi were collected from bolus-treated cattle than from controls. Numbers of engorged adult female Amblyomma hebraeum were reduced, but differences were not statistically significant (P greater than 0.10). Among cattle maintained continuously on pasture, tick numbers were reduced on the ivermectin-treated groups. A significant (P less than 0.05) treatment by linear time effect was seen for all adult ticks counted except R. appendiculatus. A significant (P less than 0.05) treatment by quadratic time effect was seen for A. hebraeum, B. decoloratus and R. evertsi evertsi, and overall treatment differences were significantly different (P less than 0.05) for these species. The differences tended to increase with time. Except for Boophilus, reductions in tick numbers on treated animals relative to controls were not readily apparent. There were no adverse reactions attributable to ivermectin treatment or the presence of the bolus. Each treated animal retained its bolus throughout the trial, based on metal detection.


Assuntos
Doenças dos Bovinos/tratamento farmacológico , Ivermectina/uso terapêutico , Infestações por Carrapato/veterinária , Administração Oral , Animais , Bovinos , Preparações de Ação Retardada , Feminino , Ivermectina/administração & dosagem , Masculino , Ninfa/isolamento & purificação , Oviposição , Rúmen , Infestações por Carrapato/tratamento farmacológico , Carrapatos/isolamento & purificação , Carrapatos/fisiologia
9.
J Pediatr Surg ; 29(4): 527-9, 1994 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-8014808

RESUMO

The authors report on four cases of Golden's syndrome, a rare disease with unknown etiology and controversial therapy. The first two 7-year-old boys had gastrointestinal bleeding; their hemoglobin levels were 7.0 g% and 7.3 g%, respectively. A blood transfusion was required. Both patients underwent gastroscopy and rectoscopy, and no source of bleeding was found. Biopsies were taken during laparotomy, after terminal ileotomy in case one and coecotomy in the other. Bowel resection was not necessary in either case. The third and fourth boys (5 and 6 years old, respectively) were treated conservatively with parenteral nutrition; blood transfusion was not necessary. All four patients recovered within several days. Control colonoscopies 6 months later showed normal mucosa. The authors discuss their diagnostic and therapeutical regime, stressing that in their experience, this rare disease does not require surgical intervention.


Assuntos
Ileíte/patologia , Criança , Pré-Escolar , Hemorragia Gastrointestinal/patologia , Humanos , Hiperplasia , Ileíte/cirurgia , Ileíte/terapia , Íleo/patologia , Mucosa Intestinal/patologia , Tecido Linfoide/patologia , Masculino , Nutrição Parenteral , Síndrome
10.
J Parasitol ; 66(4): 625-9, 1980 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-7420244

RESUMO

Attempts were made to produce repeatable infections with Eimeria wyomingensis in 2- to 4-wk-old calves. From 0.2 million to 10 million sporulated oocysts, or sporocysts from 1 million sporulated oocysts were given orally to 50 calves. Several regimens of flumethasone and dexamethasone at excessive dosage levels were given to some to the oocyst-inoculated calves. Nine of 10 calves given flumethasone and one of 12 calves given dexamethasone treatments died. Of the 41 calves which survived past post-inoculation day 21, 32 had patent infections. The prepatent period in the 32 infections was 13 to 15 (mean 14.2) days and the patent period was 1 to 7 (mean 3.6) days. More fecal oocysts were excreted by calves given sporulated oocysts than those given sporocysts. Calves given corticosteroids passed fewer oocysts than nontreated calves.


Assuntos
Doenças dos Bovinos/parasitologia , Coccidiose/veterinária , Animais , Bovinos , Coccidiose/parasitologia , Dexametasona/farmacologia , Eimeria/crescimento & desenvolvimento , Fezes/parasitologia , Flumetasona/farmacologia , Fatores de Tempo
11.
J Parasitol ; 84(1): 109-13, 1998 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-9488347

RESUMO

New morphological information on the deep-sea parasitic copepod Bobkabata kabatabobbus Hogans and Benz, 1990 (Lernaeosoleidae: Poecilostomatoida) is provided based on 2 newly discovered, complete specimens collected from a pallid sculpin, Cottunculus thomsoni (Gunther, 1882), captured in water 1,463 m deep in Welker Canyon off Rhode Island (western North Atlantic). The first antennae of both specimens were tiny, indistinctly segmented, and armed with spiniform setae. Terminal segments of the second antennae were robust hooks and were impossible to disengage from the host without severing them from their basal sockets. A simple orifice without any associated appendages may have represented the mouth. Both specimens were transformed adult females and each was embedded in the flesh of their scaleless host up to where the pregenital trunk began to broaden into its characteristic horseshoe shape. Whereas each copepod's bulbous cephalothorax appeared to be the primary attachment device, the powerfully hooked second antennae seemed positioned to facilitate the application of the presumed mouth to the host. A revised family diagnosis for Lernaeosoleidae Hogans and Benz, 1990 is provided that primarily differentiates Lernaeosoleidae from the closely allied Chondracanthidae H. Milne-Edwards, 1840 and other poecilostomatoids based on the absence of mandibles, first and second maxillae, maxillipeds, and thoracic legs 1-4 in lernaeosoleids.


Assuntos
Crustáceos/anatomia & histologia , Ectoparasitoses/veterinária , Doenças dos Peixes/parasitologia , Animais , Crustáceos/classificação , Crustáceos/ultraestrutura , Ectoparasitoses/parasitologia , Feminino , Peixes , Microscopia Eletrônica de Varredura , Água do Mar
12.
J Parasitol ; 86(3): 618-22, 2000 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-10864264

RESUMO

Skin lesions caused by the ectoparasite Dermophthirius penneri Benz, 1987 (Monogenea: Microbothriidae) on 2 wild-caught blacktip sharks (Carcharhinus limbatus) from the northern Gulf of Mexico were studied using light and scanning electron microscopy. Grossly, lesions appeared as multifocal, well-demarcated, ovoid or irregularly shaped, light gray patches of skin. Scanning electron microscopy of lesions revealed gaps between placoid scales apparently created by detachment and loss of placoid scales, rotated and tilted placoid scales with blunt distal tips and shallow ridges, and a frayed epithelium that covered some placoid scales and filled some spaces between placoid scales. Light microscopy of lesions revealed epithelial hyperplasia accompanied by dermal infiltrates of moderate numbers of loosely arranged lymphocytes interposed between collagen bundles in the superficial layers of the stratum compactum. This report provides the first details of microbothriid skin lesions on wild sharks. Our results indicate that D. penneri caused chronic skin lesions not associated with bacterial infection or severe, debilitating, skin disease in the studied sharks.


Assuntos
Doenças dos Peixes/parasitologia , Platelmintos/patogenicidade , Tubarões/parasitologia , Dermatopatias Parasitárias/veterinária , Pele/parasitologia , Infecções por Trematódeos/veterinária , Animais , Feminino , Doenças dos Peixes/patologia , Microscopia Eletrônica de Varredura , Mississippi , Pele/patologia , Pele/ultraestrutura , Dermatopatias Parasitárias/parasitologia , Dermatopatias Parasitárias/patologia , Infecções por Trematódeos/parasitologia , Infecções por Trematódeos/patologia
13.
J Parasitol ; 81(5): 754-61, 1995 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-7472868

RESUMO

Adult male and female Argulus melanostictus Wilson, 1935 are redescribed based on detailed examinations of a syntype and recently obtained specimens of both sexes collected from California grunion, Leuresthes tenuis, captured in nearshore Pacific waters at Monterey, California. A 14-16-hr seawater bath containing 0.5 microliter/L trichlorfon administered once weekly for 3 wk killed A. melanostictus while not noticeably harming grunion.


Assuntos
Crustáceos/classificação , Peixes/parasitologia , Animais , California , Crustáceos/anatomia & histologia , Feminino , Doenças dos Peixes/tratamento farmacológico , Doenças dos Peixes/parasitologia , Masculino , Triclorfon/efeitos adversos , Triclorfon/uso terapêutico
14.
J Parasitol ; 84(6): 1218-30, 1998 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-9920318

RESUMO

Trebius shiinoi n. sp. is described from females and males collected from the uterine linings and on embryos within the uteri of 2 near-term Japanese angelsharks (Squatina japonica Bleeker, 1858) captured in Suruga Bay, off central Japan, and from female specimens reported by Shiino in 1963 that were found on embryos of the clouded angelshark (Squatina nebulosa Regan, 1906) captured off Shirahama, central Japan. Shiino identified his specimens as Trebius longicaudatus Shiino, 1954. However, our comparisons between Shiino's specimens and those newly collected revealed both to represent the same species, and comparisons of these specimens to 5 syntypes of T. longicaudatus and to published information detailing other Trebius species revealed them to be a new species that differs most notably from its congeners by the enormous length of its transformed adult female's abdomen and by the presence of a distinctive nublike seta on her caudal ramus. Trebius shiinoi n. sp. is an unusual copepod because it is an endoparasite of adult female angelsharks as well as an ectoparasite of embryo angelsharks, and it is proposed that flushing of the uterine-cloacal chambers of clouded angelsharks and Japanese angelsharks may facilitate T. shiinoi infections. A redescription of T. longicaudatus is also provided.


Assuntos
Crustáceos/anatomia & histologia , Ectoparasitoses/veterinária , Doenças dos Peixes/parasitologia , Tubarões/parasitologia , Útero/parasitologia , Animais , Crustáceos/classificação , Ectoparasitoses/embriologia , Ectoparasitoses/parasitologia , Feminino , Doenças dos Peixes/embriologia , Masculino , Tubarões/embriologia , Doenças Uterinas/parasitologia , Doenças Uterinas/veterinária
15.
J Parasitol ; 84(6): 1271-4, 1998 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-9920328

RESUMO

Seven of 8 Pacific sleeper sharks (Somniosus pacificus Bigelow and Schroeder, 1944) captured in Prince William Sound, Alaska, were actively infected, and all 8 had been at one time infected with the parasitic copepod Ommatokoita elongata (Grant, 1827) (Siphonostomatoida: Lernaeopodidae). Active infections consisted of adult females and chalimus larvae that had attached to the corneas of the sharks' eyes. This report documents a new host record and possibly the only reliable record of this parasite from a host other than the Greenland shark, Somniosus microcephalus (Bloch and Schneider, 1801). It also documents the first time O. elongata has been identified outside of the Atlantic Ocean or its locally adjacent straits and seas.


Assuntos
Doenças da Córnea/veterinária , Crustáceos/fisiologia , Infecções Oculares Parasitárias/veterinária , Doenças dos Peixes/parasitologia , Tubarões/parasitologia , Animais , Córnea/parasitologia , Doenças da Córnea/parasitologia , Crustáceos/anatomia & histologia , Infecções Oculares Parasitárias/parasitologia , Feminino , Especificidade da Espécie
16.
J Parasitol ; 87(5): 972-7, 2001 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-11695418

RESUMO

Gill lesions associated with infections of Erpocotyle tiburonis (Brooks, 1934) (Monogenea: Hexabothriidae) on wild bonnethead sharks (Sphyrna tiburo (L., 1758) (Carcharhiniformes: Sphyrinidae)) were compared with those on aquarium-held ones using light and scanning electron microscopy. Uninfected gill filaments had slender, triangular, smooth-surfaced lamellae and interlamellar water channels that were approximately equal in size. Four wild sharks were each infected by 3-11 widely separated adult E. tiburonis, and 1 of these sharks hosted a juvenile specimen. Lamellae flanking or touching adult E. tiburonis were pushed aside or bent, but were otherwise identical to those of uninfected filaments. Two aquarium-held sharks were each infected by hundreds of juvenile and adult E. tiburonis. In these sharks, lamellae near juveniles were pushed apart or bent, but were otherwise normal, whereas a thick, ragged-surfaced layer of hyperplastic epithelium both filled interlamellar water channels and partially or completely covered lamellae near adults. Results of this study suggest that the intense infections of E. tiburonis were facilitated by captivity and caused severe hyperplastic lesions that ultimately led to the death of the sharks by reducing or blocking the respiratory water flow over lamellae and thus reducing the exchange of gases and ions across the lamellar epithelium. In contrast, the wild sharks were infected by fewer worms and exhibited relatively minor lesions.


Assuntos
Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Tubarões , Infecções por Trematódeos/veterinária , Animais , Feminino , Brânquias/ultraestrutura , Microscopia Eletrônica de Varredura , Trematódeos/anatomia & histologia , Trematódeos/ultraestrutura , Infecções por Trematódeos/parasitologia
17.
J Parasitol ; 86(2): 241-4, 2000 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-10780539

RESUMO

Margolisius abditus n. gen., n. sp. (Copepoda: Lernaeopodidae) is described from female specimens collected from gill lamellae of a remora, Remora remora (L.), captured in the Gulf of California near Punta Arena, Baja California. Comparison of this species with 13 lernaeopodid genera with which it shares (a) absence of posterior trunk processes; (b) presence of a relatively long cylindrical cephalothorax, usually reflected along the dorsal surface of the trunk; and (c) a marine habitat showed that it cannot be placed in any of them, thus necessitating establishment of a new genus. Margolisius abditus n. sp. is the smallest known lernaeopodid species, its ovigerous females measuring about 0.5 mm in total length.


Assuntos
Crustáceos/classificação , Ectoparasitoses/veterinária , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Animais , Crustáceos/ultraestrutura , Ectoparasitoses/parasitologia , Feminino , Peixes , México , Microscopia Eletrônica de Varredura/veterinária
18.
J Parasitol ; 67(2): 204-13, 1981 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-6165812

RESUMO

Endogenous stages of Eimeria tuskegeensis were studied in experimentally infected cotton rats, Sigmodon hispidus. Almost all parasites were located on the basilar side of the nucleus in epithelial cells on the sides and tips of villi of the small intestine. The endogenous cycle consisted of three generations of schizogony followed by gametogony. First-, second-, third-generation schizonts could be distinguished by time of appearance, size and shape of the schizont, and number, size, shape, and arrangement of merozoites. Immature gametogonous stages appeared to 84 hr postinoculation (PI) and developed into mature microgametocytes and macrogametes by 96 hr PI. Microgametocytes had a mono-centric type of development. Intermediate macrogametes had small, basophilic wall-forming bodies and mature macrogametes had large, eosinophilic wall-forming bodies. It was not possible to determine whether these were two distinct types of wall-forming bodies or whether they were different stages of a single type. Two nuclei were seen in the host's epithelial cells parasitized by schizonts, microgematocytes, macrogametes, and oocysts. This binucleate condition was apparently parasite-induced.


Assuntos
Coccidiose/parasitologia , Eimeria/crescimento & desenvolvimento , Mucosa Intestinal/parasitologia , Intestino Delgado/parasitologia , Animais , Núcleo Celular/ultraestrutura , Citoplasma/ultraestrutura , Eimeria/fisiologia , Eimeria/ultraestrutura , Movimento , Ratos , Coloração e Rotulagem
19.
J Parasitol ; 85(5): 809-14, 1999 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-10577714

RESUMO

Jusheyus shogunus Deets and Benz, 1987 (Copepoda: Eudactylinidae) is reported from wreckfish, Polyprion americanus (Schneider, 1801) collected from widely separated locations in the north Atlantic. This represents a new host record and new ocean report for this parasite. Examination of male and female copepods allowed some confusion regarding the morphology of J. shogunus to be eliminated. Jusheyus shogunus possesses a cephalothorax rather than a cephalosome and its dorsal styliform processes are connected by an internal bridging sclerite and an external dorsal plate that is hinged to its cephalothorax. Each process also articulates with its own internal ventral sclerite. A series of muscles services these structures, and comparisons of the dorsal styliform processes of J. shogunus with the dorsal stylets of Kroyeria spp. revealed some morphological similarities. Adult female J. shogunus in the study collection varied in size from 2.16 to 4.97 mm total length, and smaller and larger specimens presented somewhat different body forms. Most egg sacs contained multiseriately arranged eggs; however, several specimens possessed a sac whose distal portion contained uniseriately arranged eggs and whose proximal portion contained 2 rows of eggs. Jusheyus shogunus attaches to the gill filament lamellae of its hosts using its second antennae and maxillipeds. The dorsal styliform processes can be erected by either directly raising them or by flexing the cephalothorax at its junction with the first free thoracic segment. In either case the tips of the processes can engage 1 to several lamellae on the adjacent gill filament to help secure the parasite.


Assuntos
Crustáceos/anatomia & histologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Doenças Parasitárias em Animais/parasitologia , Animais , Oceano Atlântico , Comportamento Animal , Crustáceos/fisiologia , Crustáceos/ultraestrutura , Feminino , Doenças dos Peixes/epidemiologia , Peixes , Masculino , Microscopia Eletrônica de Varredura , Doenças Parasitárias em Animais/epidemiologia , Prevalência
20.
J Parasitol ; 87(6): 1279-90, 2001 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11780811

RESUMO

Kroeyerina deetsorum n. sp. (Copepoda: Kroyeriidae) is described from female and male specimens collected from the olfactory sacs of Atlantic sharpnose sharks, Rhizoprionodon terraenovae (Richardson, 1836), captured in the Gulf of Mexico and northwestern Atlantic. Kroeyerina deetsorum is easily distinguished from known congeners by the extremely small size of its adults (i.e., females about 1.2 mm total length and males about 1.0 mm total length). Kroeyerina deetsorum is also distinguished from its congeners by possessing a subquadrate rostrum without lobes or upturned horns. It is suspected that K. deetsorum belongs to a clade within Kroeyerina whose members only infect sharks. This report also provides first descriptions of a nauplius representing Kroeyerina and copepodids representing Kroyeriidae. The early-stage copepodid of K. deetsorum lacks a frontal organ and frontal filament and uses its chelate antennae to attach to its host.


Assuntos
Crustáceos/anatomia & histologia , Tubarões/parasitologia , Olfato , Animais , Oceano Atlântico , Feminino , Louisiana , Masculino , North Carolina , Texas
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