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1.
Dis Aquat Organ ; 158: 185-193, 2024 Jun 13.
Artículo en Inglés | MEDLINE | ID: mdl-38869094

RESUMEN

The southern king crab (SKC) Lithodes santolla is a crustacean parasitised by the bopyrid Eremitione tuberculata. This study aimed to analyse spatial and temporal variations in E. tuberculata prevalence in the juvenile SKC population of San Jorge Gulf (SJG) and adjacent waters (Argentine Patagonia), and evaluate the effects of the parasite on SKC juveniles to improve our understanding of its impact as a disease on SKC health condition. Moult increment and body weight were compared between parasitised and unparasitised individuals. The prevalence of E. tuberculata in SKC juveniles varied both spatially and temporally. In the south of SJG, the prevalence was 54.5% (n = 11). Temporal prevalence analysis revealed values lower than 17.4% in mid SJG during May and September 2015. No significant differences were observed in E. tuberculata prevalence between sexes or among seasons. Eremitione tuberculata had a negative effect on SKC growth (lower body dry mass, moult increment and relative increment rate) in parasitised individuals. We hypothesised that the higher prevalence of E. tuberculata in the south SJG could be attributed to the retention of parasite larvae and the presence of the frontal system in this part of the gulf. The temporal variations could reflect host mortality. Our results suggest that bopyrid infestation may have a more important role than previously believed in the dynamics of the SKC population in mid-Patagonia.


Asunto(s)
Anomuros , Isópodos , Anomuros/crecimiento & desarrollo , Anomuros/parasitología , Isópodos/fisiología , Argentina , Distribución Animal , Estaciones del Año , Animales , Dinámica Poblacional
2.
BMC Genomics ; 20(1): 388, 2019 May 18.
Artículo en Inglés | MEDLINE | ID: mdl-31103028

RESUMEN

BACKGROUND: Hydrothermal vents and cold seeps are typical deep-sea chemosynthetically-driven ecosystems that allow high abundance of specialized macro-benthos. To gather knowledge about the genetic basis of adaptation to these extreme environments, species shared between different habitats, especially for the dominant species, are of particular interest. The galatheid squat lobster, Shinkaia crosnieri Baba and Williams, 1998, is one of the few dominant species inhabiting both deep-sea hydrothermal vents and cold seeps. In this study, we performed transcriptome analyses of S. crosnieri collected from the Iheya North hydrothermal vent (HV) and a cold seep in the South China Sea (CS) to provide insights into how this species has evolved to thrive in different deep-sea chemosynthetic ecosystems. RESULTS: We analyzed 5347 orthologs between HV and CS to identify genes under positive selection through the maximum likelihood approach. A total of 82 genes were identified to be positively selected and covered diverse functional categories, potentially indicating their importance for S. crosnieri to cope with environmental heterogeneity between deep-sea vents and seeps. Among 39,806 annotated unigenes, a large number of differentially expressed genes (DEGs) were identified between HV and CS, including 339 and 206 genes significantly up-regulated in HV and CS, respectively. Most of the DEGs associated with stress response and immunity were up-regulated in HV, possibly allowing S. crosnieri to increase its capability to manage more environmental stresses in the hydrothermal vents. CONCLUSIONS: We provide the first comprehensive transcriptomic resource for the deep-sea squat lobster, S. crosnieri, inhabiting both hydrothermal vents and cold seeps. A number of stress response and immune-related genes were positively selected and/or differentially expressed, potentially indicating their important roles for S. crosnieri to thrive in both deep-sea vents and cold seeps. Our results indicated that genetic adaptation of S. crosnieri to different deep-sea chemosynthetic environments might be mediated by adaptive evolution of functional genes related to stress response and immunity, and alterations in their gene expression that lead to different stress resistance. However, further work is required to test these proposed hypotheses. All results can constitute important baseline data for further studies towards elucidating the adaptive mechanisms in deep-sea crustaceans.


Asunto(s)
Adaptación Fisiológica , Anomuros/genética , Biodiversidad , Frío , Respiraderos Hidrotermales , Transcriptoma , Secuencia de Aminoácidos , Animales , Anomuros/crecimiento & desarrollo , Anomuros/metabolismo , Ecosistema , Filogenia , Homología de Secuencia
3.
J Exp Biol ; 222(Pt 10)2019 05 13.
Artículo en Inglés | MEDLINE | ID: mdl-31019065

RESUMEN

For many animals, evolution has selected for complex visual systems despite the high energetic demands associated with maintaining eyes and their processing structures. Therefore, the metabolic demands of visual systems make them highly sensitive to fluctuations in available oxygen. In the marine environment, oxygen changes over daily, seasonal and inter-annual time scales, and there are large gradients of oxygen with depth. Vision is linked to survival in many marine animals, particularly among the crustaceans, cephalopods and fish, and early life stages of these groups rely on vision for prey capture, predator detection and their distribution in the water column. Using in vivo electroretinogram recordings, we show that there is a decrease in retinal sensitivity to light in marine invertebrates when exposed to reduced oxygen availability. We found a 60-100% reduction in retinal responses in the larvae of cephalopods and crustaceans: the market squid (Doryteuthis opalescens), the two-spot octopus (Octopus bimaculatus), the tuna crab (Pleuroncodes planipes) and the graceful rock crab (Metacarcinus gracilis). A decline in oxygen also decreases the temporal resolution of vision in D. opalescens These results are the first demonstration that vision in marine invertebrates is highly sensitive to oxygen availability and that the thresholds for visual impairment from reduced oxygen are species-specific. Oxygen-impaired retinal function may change the visual behaviors crucial to survival in these marine larvae. These findings may impact our understanding of species' vulnerability to ocean oxygen loss and suggest that researchers conducting electrophysiology experiments should monitor oxygen levels, as even small changes in oxygen may affect the results.


Asunto(s)
Organismos Acuáticos/fisiología , Oxígeno/metabolismo , Visión Ocular , Animales , Anomuros/crecimiento & desarrollo , Anomuros/fisiología , Organismos Acuáticos/crecimiento & desarrollo , Braquiuros/crecimiento & desarrollo , Braquiuros/fisiología , Decapodiformes/crecimiento & desarrollo , Decapodiformes/fisiología , Larva/crecimiento & desarrollo , Larva/fisiología , Octopodiformes/crecimiento & desarrollo , Octopodiformes/fisiología
4.
Bull Environ Contam Toxicol ; 101(3): 320-325, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-30030595

RESUMEN

Environmental pollution of aquatic ecosystems leads to an interference in several fundamental biochemical and physiological functions. In this study the interference of Cd and Pb pollutions on the physiological growth and subsequently on the age determination was investigated. The hermit crab, Coenobita scaevola (C.s) was selected as a bioaccumulator in this study. The direct and indirect age determination methods were carried out using annual band counts and carapace length, respectively. The results showed that, there was very low correlation (R2 < 0.5) between direct and indirect age determination. Wavelet Neural Network (WNN) was applied to take into account the environmental effects such as the accumulation of Cd and Pb elements in the C.s' tissues. It was observed that WNN successfully enhanced the growth rate model and estimated the C.s' age (R2 > 0.95). In addition, it was concluded that the environmental pollution had interaction with the growth physiology such as weight and length.


Asunto(s)
Anomuros/efectos de los fármacos , Cadmio/toxicidad , Plomo/toxicidad , Redes Neurales de la Computación , Contaminantes Químicos del Agua/toxicidad , Animales , Anomuros/crecimiento & desarrollo , Anomuros/metabolismo , Monitoreo del Ambiente/métodos , Contaminación Ambiental
5.
An Acad Bras Cienc ; 86(4): 1769-82, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25590715

RESUMEN

The main goal of this investigation was to characterize the population structure and shell occupancy of two sympatric hermit-crab species, Pagurus brevidactylus and Paguristes tortugae. The study was undertaken at Couves Island on the southeastern coast of Brazil, from March 2010 through February 2011, on subtidal rocky bottoms. Specimens were collected by SCUBA diving sessions. A total of 195 individuals of P. brevidactylus and 132 of P. tortugae were examined. Both populations showed unimodal size-frequency distributions, which were non-normal for P. brevidactylus and normal for P. tortugae. The median size of P. brevidactylus was significantly smaller than P. tortugae; in both species, males were significantly larger than females. For both, juveniles and ovigerous females were recorded in all size classes and in almost the entire sampling period. No significant departures from the 1:1 sex ratio were detected, although some size classes were skewed. Overlaps in shell occupation were recorded. Pagurus brevidactylus and P. tortugae showed similar population features; they reached sexual maturity at small sizes, and the nearly year-round presence of young and ovigerous females suggests continuous reproduction. These inter-specific interactions involving resource partitioning suggest a regulatory process that is probably part of the equilibrium strategy of these populations.


Asunto(s)
Anomuros/fisiología , Animales , Anomuros/clasificación , Anomuros/crecimiento & desarrollo , Brasil , Femenino , Masculino , Reproducción/fisiología , Estaciones del Año , Razón de Masculinidad , Maduración Sexual
6.
J Exp Zool B Mol Dev Evol ; 320(8): 511-24, 2013 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-24038813

RESUMEN

Using serial semi-thin sections and digital 3D-reconstructions we studied the nervous systems of zoea-I larvae in three decapod species, Hippolyte inermis (Leach, 1815), Porcellana platycheles (Pennant, 1777), and Pachygrapsus marmoratus (Fabricius, 1787). These taxa represent three decapod lineages, that is, Caridea, Anomura, and Brachyura, each characterized by specific zoea-I morphology. Special attention was paid to development of ganglia, neuropil composition, and segmental nerves. In all zoeae studied, the overall elements, for example, the segmental ganglia, their neuropils and most of the nerves of the adult decapod nervous system are present. Ongoing differentiation processes are observable as well, most obvious in segments with well-developed limbs the ganglia are in a more advanced stage of differentiation and more voluminous compared to segments with only limb buds or without externally visible limb anlagen. Intra- and interspecific comparisons indicate that neuromere differentiation thus deviates from a simple anterior-posterior gradient as, for example, posterior thoracic neuromeres are less developed than those of the pleon. In addition, the differences in the progress of the development of ganglia between the studied taxa can best be attributed to heterochronic mechanisms. Taxon and stage-specific morphologies indicate that neuronal architecture reflects both, morphogenesis to the adult stage and specific larval adaptions, and provides sets of characters relevant to understanding the corresponding phylogeny.


Asunto(s)
Anomuros/anatomía & histología , Braquiuros/anatomía & histología , Decápodos , Sistema Nervioso/anatomía & histología , Palaemonidae/anatomía & histología , Animales , Anomuros/crecimiento & desarrollo , Braquiuros/crecimiento & desarrollo , Croacia , Embrión no Mamífero , Desarrollo Embrionario , Ganglios de Invertebrados , Larva/anatomía & histología , Sistema Nervioso/crecimiento & desarrollo , Palaemonidae/crecimiento & desarrollo , Filogenia
7.
Zootaxa ; 3664: 149-75, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-26266295

RESUMEN

Five new species from the squat lobster family Chirostylidae are described from the continental margin of western Australia: Uroptychus albus sp. nov., Uroptychus bardi sp. nov., Uroptychus jawi sp. nov., Uroptychus taylorae sp. nov., and Uroptychus worrorra sp. nov. New records of Indo-West Pacific species for Australia are: Gastroptychus brachyterus Baba, 2005, Gastroptychus investigatoris Alcock, 1899, Uroptychodes grandirostris (Yokoya, 1933), Uroptychodes inortenseni (Van Dam, 1939), Uroptychus scandens Benedict, 1902, Uroptychus ciliatus (Van Dam, 1933) and Uroptychus vandamae Baba, 1988. New distributional records are given for species previously recorded from Australia: Uroptychus flindersi Ahyong & Poore, 2004, Uroptychus hesperius Ahyong & Poore, 2004, Uroptychusjoloensis Van Dam, 1939, Uroptychus nigricapillis Alcock, 1901, and Uroptychus spinirostris (Ahyong & Poore, 2004). These new records expand the number of chirostylid species in Australia from 34 to 46. Keys to Australian species of the genera Gastroptychus, Uroptychodes and Uroptychus are provided.


Asunto(s)
Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Australia , Tamaño Corporal , Femenino , Masculino , Tamaño de los Órganos
8.
Zootaxa ; 3670: 274-82, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-26438939

RESUMEN

The pagurid hermit crab genus Trichopagurus de Saint Laurent, 1968 is currently represented by three shallow water spe- cies from the tropical Indo-West Pacific region. In this paper, three species of the genus, including one new species, are reported. Trichopagurus tenuidactylus n. sp. is described on the basis of a single ovigerous female from the Bohol Sea, the Philippines, and compared with two close relatives, T. asper Komai & Poupin, 2012 and T. macrochela Komai & Os- awa, 2005. New locality records are provided for T. macrochela (the Philippines) and T. trichophthalinus (Forest, 1954) (Taiwan and Marianas). An identification key to the four species of the genus is presented.


Asunto(s)
Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Tamaño Corporal , Femenino , Masculino , Tamaño de los Órganos , Filipinas
9.
Zootaxa ; 3722: 283-300, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-26171527

RESUMEN

Patagurus rex gen. et sp. nov., a deep-water pagurid hermit crab, is described and illustrated based on a single specimen dredged from 400 m off Moorea, Society Islands, French Polynesia. Patagurus is characterized by a subtriangular, vaulted, calcified carapace, with large, wing-like lateral processes, and is closely related to two other atypical pagurid genera, Porcellanopagurus Filhol, 1885 and Solitariopagurus Türkay, 1986. The broad, fully calcified carapace, calcified branchiostegites, as well as broad and rigidly articulated thoracic sternites make this remarkable animal one of the most crab-like hermit crabs. Patagurus rex carries small bivalve shells to protect its greatly reduced pleon. Carcinization pathways among asymmetrical hermit crabs and other anomurans are briefly reviewed and discussed.


Asunto(s)
Anomuros/clasificación , Decápodos/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Tamaño Corporal , Decápodos/anatomía & histología , Decápodos/crecimiento & desarrollo , Ecosistema , Femenino , Masculino , Tamaño de los Órganos , Polinesia
10.
Evol Dev ; 12(1): 74-83, 2010.
Artículo en Inglés | MEDLINE | ID: mdl-20156284

RESUMEN

Mutations or environmental factors that result in reversal of conspicuous left-right asymmetries provide an opportunity to study developmental mechanisms. They may also provide insight into evolutionary changes in asymmetry states within and between species. King crabs (family Lithodidae) have a larger right claw and females typically exhibit a dextrally offset abdomen. Nevertheless, I observed a high incidence of left handedness in laboratory reared box crabs (Lopholithodes foraminatus) and captured the first known egg-bearing female lithodid to exhibit reversed asymmetry. This provided a unique opportunity to characterize the reversed phenotype and to compare the incidence of reversed asymmetry in the offspring of normal and reversed females. Asymmetry of the chelae became apparent in the first postzoeal stage (glaucothoe) and handedness was maintained through subsequent instars. Females with larger left claws developed reversed abdominal asymmetry by the fourth crab stage. No reversed asymmetry was observed in the mandibles of zoea larvae or juveniles of either handedness. The incidence of reversed asymmetry in glaucothoe reared from one reversed and three normal females was high (between 20% and 30%), and independent of maternity (P=0.67). Removal of the right cheliped of fourth stage zoeae, and the major cheliped of glaucothoe, did not reverse the direction of asymmetry. Elevated larval rearing temperature also did not affect the frequency of reversed individuals. This lack of evidence for either heritability or induction of handedness is enigmatic. Further investigation of reversed asymmetry in lithodid crabs may provide valuable insights into the development and evolution of bilateral asymmetries.


Asunto(s)
Anomuros/crecimiento & desarrollo , Anomuros/genética , Abdomen/crecimiento & desarrollo , Estructuras Animales/crecimiento & desarrollo , Animales , Evolución Biológica , Tipificación del Cuerpo/genética , Femenino , Larva/crecimiento & desarrollo , Mandíbula/crecimiento & desarrollo , Microscopía Electrónica de Rastreo , Fenotipo , Temperatura
11.
Sci Rep ; 10(1): 6385, 2020 04 14.
Artículo en Inglés | MEDLINE | ID: mdl-32286466

RESUMEN

The impacts invasive species have on biodiversity and ecosystem function globally have been linked to the higher abundances they often obtain in their introduced compared to native ranges. Higher abundances of invaders in the introduced range are often explained by a reduction in negative species interactions in that range, although results are equivocal. The role of positive interactions in explaining differences in  the abundance of invaders between native and invasive ranges has not been tested. Using biogeographic surveys, we showed that the rocky shore porcelain crab, Petrolisthes elongatus, was ~4 times more abundant in its introduced (Tasmania, Australia) compared to its native (New Zealand) range. The habitat of these crabs in the invaded range (underside of intertidal boulders) was extensively covered with the habitat-forming tubeworm Galeolaria caespitosa. We tested whether the habitat provided by the tubeworm facilitates a higher abundance of the invasive crab by creating mimics of boulders with and without the tubeworm physical structure and measured crab colonisation into these habitats at three sites in both Tasmania and New Zealand. Adding the tubeworm structure increased crab abundance by an average of 85% across all sites in both ranges. Our intercontinental biogeographic survey and experiment demonstrate that native species can facilitate invader abundance and that positive interactions can be important drivers of invasion success.


Asunto(s)
Anomuros/crecimiento & desarrollo , Ecosistema , Especies Introducidas , Animales , Poliquetos , Densidad de Población , Conducta Espacial , Tasmania
12.
PLoS One ; 15(5): e0232880, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32401761

RESUMEN

The southern king crab (SKC) Lithodes santolla is an important commercial species in southern South America. Fishing pressure has caused the deterioration of its stocks. Currently, culture techniques are being developed for producing SKC juveniles to enhance the natural population and to recover the fishing stock. Therefore, it is necessary to know about physiology, energetic and nutritional requirements for SKC maintenance in hatchery. Thus, this study aims to evaluate the biochemical and physiological changes in the midgut gland, muscle and hemolymph of juveniles, pre-adults and adults of wild SKC. The energetic reserves, digestive enzymes activity, amino acid profile and energy were quantified in twelve juveniles, ten pre-adult, and ten adult crabs. Juveniles showed high glycogen and low lipids in the midgut gland, and low proteins and low lactate in muscle. In the hemolymph, juveniles had high lipids. Pre-adults had high glycogen and lipids in the midgut gland, and both high protein and lactate in muscle. In the hemolymph, pre-adults had high lipids. Adults had low glycogen and high lipids in midgut gland, and both high proteins and high lactate in muscle. In hemolymph, adults had high glucose and lactate. Juveniles and pre-adults had high proteinase activity, whereas adults had high lipase activity. Major essential amino acids of SKC were arginine, methionine, and tryptophan, and the non-essential amino acids were glycine, aspartic acid and glutamic acid. On another hand, SKC had similar energy in the midgut gland and muscle, regardless of the ontogenetic stage. Moreover, we demonstrated that the biochemical energy calculation underestimates the actual measured values by a calorimeter. Thus, our results help to understand the physiological changes, energetic and nutritional requirements of L. santolla, and this study is a baseline for research on diet formulation for maintaining this species under culture conditions.


Asunto(s)
Anomuros/fisiología , Acuicultura/métodos , Proteínas de Artrópodos/genética , Optogenética/métodos , Aminoácidos/análisis , Alimentación Animal , Animales , Anomuros/citología , Anomuros/crecimiento & desarrollo , Dieta , Metabolismo Energético , Femenino , Regulación del Desarrollo de la Expresión Génica , Regulación Enzimológica de la Expresión Génica , Hemolinfa , Masculino , Músculos/química
14.
Zootaxa ; 4154(4): 477-84, 2016 Aug 23.
Artículo en Inglés | MEDLINE | ID: mdl-27615853

RESUMEN

A new species, Munidopsis militaris n. sp., from the Carlsberg Ridge, Northwest Indian Ocean Ridge is described herein. The species belongs to a group of species having a pair of epigastric spines, mesial and lateral eye-spines, abdominal tergites unarmed, five or six spines on the lateral margin of the carapace, and a denticulate carina on the distolateral margin of the P1 fixed finger. It can be distinguished from its relatives by the spinous lateral margin of the palm and dorsal carinae on the P2-4 propodus. The Munidopsis fauna of the Indian Ocean Ridge is seldom reported on; this new species is the sixth member of this genus found inhabiting the Indian Ocean Ridge.


Asunto(s)
Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Tamaño Corporal , Ecosistema , Femenino , Océano Índico , Masculino , Tamaño de los Órganos
15.
Zootaxa ; 4088(3): 301-28, 2016 Mar 09.
Artículo en Inglés | MEDLINE | ID: mdl-27394343

RESUMEN

Collections made during the recent expeditions to Papua New Guinea ("BIOPAPUA", 2010; "PAPUA NIUGINI", 2012) yielded a total of 12 species from the "symmetrical" hermit crab family Pylochelidae, including two new to science: Bathycheles incisus (Forest, 1987), B. integer (Forest, 1987), Cheiroplatea laticauda Boas, 1926, C. pumicicola Forest, 1987, C. rotundioculus n. sp., Pylocheles mortensenii Boas, 1926, and Xylocheles macrops (Forest, 1987) (Pylochelinae); Parapylocheles scorpio (Alcock, 1894), Trizocheles manningi Forest, 1987, T. moosai Forest, 1987, T. sakaii Forest, 1987, and T. spinidigitus n. sp. (Trizochelinae). Affinities of the two new species are discussed. Parapylocheles scorpio, Trizocheles manningi and T. sakaii are recorded from the South Pacific for the first time. Revised identification keys to species of Cheiroplatea and Trizocheles are provided.


Asunto(s)
Anomuros/anatomía & histología , Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/crecimiento & desarrollo , Tamaño Corporal , Ecosistema , Expediciones , Femenino , Masculino , Tamaño de los Órganos , Papúa Nueva Guinea
16.
Zootaxa ; 4105(2): 171-80, 2016 Apr 20.
Artículo en Inglés | MEDLINE | ID: mdl-27394771

RESUMEN

The holotype of Clibanarius sachalinicus Kobjakova, 1955 and Clibanarius hirsutimanus Kobjakova, 1971 in the collection of Zoological Institute of Russian Academy of Sciences (Saint-Petersburg, Russia) are examined. As a result, Clibanarius hirsutimanus Kobjakova, 1971 is found to be a species of Areopaguristes nigroapiculus (Komai, 2009) while Clibanarius sachalinicus Kobjakova, 1955 is a species of Clibanarius virescens (Krauss, 1843). Remarks on a single record of Diogenes penicillatus Stimpson, 1858 from Shamora Bay (Usury Bay) of the Sea of Japan as well as current faunal list of hermit crabs from the Russian coasts of the Sea of Japan are also presented in the paper.


Asunto(s)
Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Biodiversidad , Tamaño Corporal , Femenino , Japón , Masculino , Museos , Tamaño de los Órganos , Federación de Rusia
17.
Zootaxa ; 4109(5): 542-54, 2016 May 11.
Artículo en Inglés | MEDLINE | ID: mdl-27394885

RESUMEN

Two species of the squat lobster genus Munida Leach, 1820, M. pollioculus n. sp. and M. zebra Macpherson, 1994, are recorded from deep-waters off Okinawa Islands, the Ryukyu Islands, at depths of 1000 m and 495 m, respectively. The new species closely resembles M. clevai Macpherson, 1999 and M. microps Alcock, 1894, but it differs from the latter two in the absence of a proximal spine on the mesial margin of the cheliped dactylus and the more stout dactylus of the second pereopod. Munida zebra is first recorded from the Northwest Pacific, as well as Japanese waters, with its geographical range extended to the north from the previously known southwestern Pacific localities.


Asunto(s)
Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Tamaño Corporal , Femenino , Islas , Japón , Tamaño de los Órganos , Océano Pacífico
18.
Zootaxa ; 4066(2): 173-6, 2016 Jan 14.
Artículo en Inglés | MEDLINE | ID: mdl-27395543

RESUMEN

Lithodid crabs (Lithodidae Samouelle, 1819), commonly known as king crabs, are frequent targets of commercial fishing worldwide with most of them living in deep water (Sakai 1971; Ahyong et al. 2010). Lithodes Latreille, 1806, is the second largest genus of lithodid crabs, currently including 29 species worldwide (Ahyong 2010). In Taiwanese waters, however, only two species, L. turritus Ortmann, 1892, and L. formosae Ahyong & Chan, 2010, have been reported (Wu et al. 1998; Ahyong & Chan 2010; Ahyong et al. 2010). We report herein the discovery of L. longispina Sakai, 1971, previously known reliably only from Japan (Sakai 1971; Ikeda 1998; Ahyong 2010), from off southwestern Taiwan, including a specimen collected in the vicinity of a cold seep.


Asunto(s)
Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/anatomía & histología , Anomuros/crecimiento & desarrollo , Tamaño Corporal , Ecosistema , Femenino , Masculino , Océanos y Mares , Tamaño de los Órganos , Taiwán
19.
Zootaxa ; 4193(1): zootaxa.4193.1.1, 2016 Nov 15.
Artículo en Inglés | MEDLINE | ID: mdl-27988701

RESUMEN

The taxonomy of the Brazilian aeglid species Aegla paulensis Schmitt, 1942 from two disjunct hydrographic basins is revised using morphological and molecular data. Results show that six disjunctive populations of Aegla paulensis form a species complex. Aegla paulensis sensu stricto is redescribed and Aegla rosanae Campos Jr., 1998 is revalidated. The four remaining populations previously assigned to Aegla paulensis are now recognized as different species, namely Aegla  vanini n. sp., Aegla japi n. sp., Aegla jaragua n. sp. and Aegla jundiai n. sp. All new species are described and illustrated and are well supported by both morphological and molecular data. Aegla lancinhas Bond-Buckup & Buckup in Santos et al., 2015, which until recently was confounded with Aegla paulensis s. str., is supported as a valid species. A key to all members of the A. paulensis species complex is provided, and their phylogenetic and biogeographic relationships to other closely related species is discussed.


Asunto(s)
Anomuros/anatomía & histología , Anomuros/clasificación , Distribución Animal , Estructuras Animales/anatomía & histología , Estructuras Animales/crecimiento & desarrollo , Animales , Anomuros/genética , Anomuros/crecimiento & desarrollo , Biodiversidad , Tamaño Corporal , Brasil , Conservación de los Recursos Naturales , Ecosistema , Femenino , Masculino , Tamaño de los Órganos , Filogenia
20.
J Parasitol ; 91(6): 1502-4, 2005 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-16539043

RESUMEN

Commercial crab populations off the Kamchatka coasts are infested to a considerable degree by the rhizocephalan parasite Briarosaccus callosus: of 769 Lithodes aequispina males examined, 43 (5.7%) were parasitized. Infestations result in the feminization of the crabs, a significant decrease in the cheliped length, and a significant decrease in the carapace length and width. We suggest that commercial selection of healthy males, and the returning of unsuitable crabs, including infested ones, back into the sea, results in an increase of the proportion of infested crabs in the population, their elimination from reproduction, and, eventually, the gradual degradation of a whole population. To minimize as far as possible the negative effects of commercial crab harvesting, all infested crab specimens caught must be destroyed, either aboard or elsewhere, instead of throwing them back into the sea.


Asunto(s)
Anomuros/parasitología , Crustáceos/fisiología , Animales , Anomuros/crecimiento & desarrollo , Anomuros/fisiología , Conducta Animal , Crustáceos/patogenicidad , Femenino , Explotaciones Pesqueras/métodos , Interacciones Huésped-Parásitos , Masculino
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