Relevant bibliographies by topics / Astacidés

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Academic literature on the topic 'Astacidés'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 February 2023

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Journal articles on the topic "Astacidés"

1

Kawai, Tadashi, Tomáš Policar, and Antonín Kouba. "Gill Morphology and Formulae of European Astacidae." Freshwater Crayfish 26, no. 2 (2021): 127–37. http://dx.doi.org/10.5869/fc.2021.v26-2.127.

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Abstract We examined gills (podobranchs, arthrobranchs and pleurobranchs) from five European Astacidae (Austropotamobius pallipes, Austropotamobius torrentium, Astacus astacus, Pontastacus leptodactylus and Pontastacus pachypus) to assess the relationships between their phylogeny and gill morphology and formulae. In addition, we checked for the presence or absence of pleurocoxal lappets. The morphology of the gills and associated structures was similar in all examined European astacid species except for three rudimentary pleurobranchs found in P. pachypus. In European Astacidae and Cambaroididae, the pleurocoxal lappets are absent but are present in the American Astacidae, Cambaridae and Parastacidae. The number of pleurobranchs decreases from the most primitive Parastacidae to the most advanced Cambaridae. Nevertheless, although the most primitive parastacid crayfish and the most advanced Cambaridae all have pleurocoxal lappets, they are absent in European Astacidae and Cambaroididae, which suggests that a reversible gill morphology has occurred in crayfish evolution.
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2

Hamr, P. "Embryonic and postembryonic development in the Tasman freshwater crayfishes Astacopsis gouldi, Asatcopisis franklinni and Parastacoides tasmanicus tasmanicus (Decapoda : Parastacidae)." Marine and Freshwater Research 43, no. 4 (1992): 861. http://dx.doi.org/10.1071/mf9920861.

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The embryonic and postembryonic development of the endemic Tasmanian freshwater crayfishes of the genera Astacopsis and Parastacoides was studied and described in detail. The embryonic development was similar in the two genera and corresponded to that described for other Parastacidae and Astacidae, but a prominent change in the colour of the yolk that parallels embryonic development was also noted. The general development sequence of young from Stage 1 to Stage 3 in Astacopsis and Parastacoides is similar to that described for other parastacid, astacid and cambarid crayfishes, but major differences in development between Astacopsis and other crayfishes are an extra developmental stage as well as the timing of the development of the uropods. The postembryonic development in Astacopsis is different from that in other parastacids as well as astaciddcambarids in having retained some of the ancestral marine larval characters, and it is considered to be primitive. Given this new information, it is proposed that early development in freshwater crayfishes recapitulates the entire primitive decapod sequence of larval stages.
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3

AHYONG, SHANE T. "Phylogeny of the clawed lobsters (Crustacea: Decapoda: Homarida)." Zootaxa 1109, no. 1 (2006): 1. http://dx.doi.org/10.11646/zootaxa.1109.1.1.

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The generic and familial structure of the clawed lobsters, Homarida, was studied by cladistic analysis. Previous phylogenetic studies of the clawed lobster genera have focussed on the putative nephropoid families: Nephropidae, Thaumastochelidae, and Chilenophoberidae. Recent high-level studies of decapod phylogeny, however, show that in addition to Nephropidae and Thaumastochelidae (both Nephropoidea), the Enoplometopidae (Enoplometopoidea) are ingroup homaridans. Conversely, the homaridan placement of Chilenophoberidae has been questioned, instead possibly having astacidan affinities. This study, building on previous analyses, incorporates additional taxa and data to examine phylogenetic relationships of the genera and families. Analyses were conducted including both extant and extinct taxa (analysis A), and with extant taxa only (analysis B). The resulting topologies from analyses A & B were largely compatible indicating that the phylogenetic signal among homaridan genera was not significantly impacted by fossil taxa. Results support recognition of Nephropoidea, comprising Thaumastochelidae and Nephropidae, and Enoplometopoidea, comprising Enoplometopidae and Uncinidae. Affinities of Chilenophoberidae were found to lie with Astacida rather than Homarida, albeit with weak jackknife support. Thaumastochelidae is strongly supported as monophyletic, with two extant genera and the extinct Oncopareia. Present data, however, are equivocal about an independently monophyletic Nephropidae.
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4

Kawai, Tadashi. "Description of the First Juvenile Stage of Cambaroides dauricus and the Second Juvenile Stage of Pacifastacus connectens." Freshwater Crayfish 26, no. 1 (2020): 51–61. http://dx.doi.org/10.5869/fc.2021.v26-1.51.

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Abstract Morphology of the first juvenile stage of Cambaroides dauricus (Cambaroididae) and the second juvenile stage of Pacifastacus connectens (Astacidae) are described and illustrated. Morphological features of body regions, setae, and number of articles of appendages are compared with that of other species of Cambaroididae and Astacidae, respectively. For each taxon, the characteristics of the juvenile body and appendages are similar to their respective family members. The relationships between European Astacidae are examined in light of the findings.
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5

Harlioğlu, Muzaffer M. "Visibility of precursors of the gonopods in a freshwater crayfish, Astacus leptodactylus Eschscholtz, 1823 (Decapoda, Astacidae)." Crustaceana 89, no. 3 (2016): 369–81. http://dx.doi.org/10.1163/15685403-00003528.

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Astacus leptodactylusEschscholtz, 1823 is an important, marketable species of crustacean, consumed intensely as a luxury food in many countries. BecauseA. leptodactylusis less cannibalistic than other crayfish species, is more fecund, and has a fast growth rate, it is accepted as a considerably suitable crayfish for culturing in extensive pond systems. Information on the reproductive biology and anatomy of crayfish is important for developing suitable production methods. Sex recognition may also be essential in separating males and females in crayfish rearing (i.e., to prevent cannibalism, males grow faster than females). Although male reproductive system morphology and spermatophore formation in crayfish, includingA. leptodactylus, have been studied in detail, this study is the first to demonstrate the visibility of precursors of the gonopods and, thus, the actual presence of gonopods, which of course determine the male sex, in a freshwater crayfish. The present study shows that the first signs of secondary sexual characters (i.e., precursors of the gonopods) can be distinguished in the form of small tubercles on the first abdominal somite in male stage 4 juveniles, and the gonopods themselves are distinguishable in male stage 5 juveniles inA. leptodactylus. In conclusion, sex differentiation inA. leptodactyluscan be realized already in stage 4 juveniles. Further studies should be carried out on the presence and shape of precursors of gonopods in stage 4 and gonopods in stage 5 juveniles of species of astacid crayfish in order to facilitate solving taxonomic problems in the family Astacidae.
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6

Yi, Shaokui, Long Zhang, Yanhe Li, et al. "Genetic diversity and phenotypic variation of the red swamp crayfish, Procambarus clarkii (Girard, 1852) (Decapoda: Astacidea: Astacidae), in China." Journal of Crustacean Biology 40, no. 5 (2020): 574–83. http://dx.doi.org/10.1093/jcbiol/ruaa055.

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Abstract The red swamp crayfish, Procambarus clarkii (Girard, 1852), is a paradox in China because it has developed as a popular aquaculture species while becoming a notorious invasive species. We investigated the population genetic diversity and population dynamics of wild Chinese populations of P. clarkii based on proPO fragments and the morphological traits across these populations. The results showed that the populations of P. clarkii exhibit high genetic diversity and significant population structure, inferring that the crayfish was artificially transferred rapidly among different locations for different reasons. Results also revealed distinct phenotypic differentiation, with individuals of some populations having a shorter pleon and wider carapace width, whereas other populations have a small length to width ratio. This study provided comprehensive insights into the population dynamics and morphological variations of P. clarkii, which contribute to understanding the rapid evolution of phenotypic traits after its successful invasion. Results should help establish efficient management strategies for the control of the invasion and at the same time using the genetic information in crayfish aquaculture.
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7

Gomis-Rüth, F. Xavier, Sergio Trillo-Muyo, and Walter Stöcker. "Functional and structural insights into astacin metallopeptidases." Biological Chemistry 393, no. 10 (2012): 1027–41. http://dx.doi.org/10.1515/hsz-2012-0149.

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Abstract The astacins are a family of multi-domain metallopeptidases with manifold functions in metabolism. They are either secreted or membrane-anchored and are regulated by being synthesized as inactive zymogens and also by co-localizing protein inhibitors. The distinct family members consist of N-terminal signal peptides and pro-segments, zinc-dependent catalytic domains, further downstream extracellular domains, transmembrane anchors, and cytosolic domains. The catalytic domains of four astacins and the zymogen of one of these have been structurally characterized and shown to comprise compact ∼200-residue zinc-dependent moieties divided into an N-terminal and a C-terminal sub-domain by an active-site cleft. Astacins include an extended zinc-binding motif (HEXXHXXGXXH) which includes three metal ligands and groups them into the metzincin clan of metallopeptidases. In mature, unbound astacins, a conserved tyrosine acts as an additional zinc ligand, which is swung out upon substrate or inhibitor binding in a ‘tyrosine switch’ motion. Other characteristic structural elements of astacin catalytic domains are three large α-helices and a five-stranded β-sheet, as well as two or three disulfide bonds. The N-terminal pro-segments are variable in length and rather unstructured. They inhibit the catalytic zinc following an ‘aspartate-switch’ mechanism mediated by an aspartate embedded in a conserved motif (FXGD). Removal of the pro-segment uncovers a deep and extended active-site cleft, which in general shows preference for aspartate residues in the specificity pocket (S1′). Furthermore, astacins undergo major rearrangement upon activation within an ‘activation domain,’ and show a slight hinge movement when binding substrates or inhibitors. In this review, we discuss the overall architecture of astacin catalytic domains and their involvement in function and zymogenic activation.
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8

Kawai, Tadashi, and Jiří Patoka. "Morphology of gastric mills and mandibles of New Guinean parastacid crayfishes, with comparisons with other Astacidea (Decapoda)." Journal of Crustacean Biology 40, no. 6 (2020): 692–703. http://dx.doi.org/10.1093/jcbiol/ruaa081.

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Abstract Knowledge of the morphological features of crayfishes native to New Guinea is limited in many cases, the internal morphology, gastric mills, and mandibles of six species of Cherax species (Decapoda: Astacidea: Parastacidae) from this island were described and illustrated. The measurements were compared with those of parastacid crayfish from Madagascar and New Zealand, with Enoplometopoidea from coral reefs, and Nephropidea from deep sea. Characters peculiar to the family Parastacidae were found both in gastric mills and mandibles, and differences between the morphology of mandibles in freshwater and marine species from the infraorder Astacidea were found. Relationships between functional morphology and feeding behaviour were discussed.
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9

Larson, Jennifer. "Astacides the Goatherd (Callim. Epigr. 22 PF.)." Classical Philology 92, no. 2 (1997): 131–37. http://dx.doi.org/10.1086/449341.

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10

Kawai, Tadashi. "Re-description of Pacifastacus gambelii (Decapoda: Astacidae)." Crustacean Research Special2012, no. 7 (2012): 59–68. http://dx.doi.org/10.18353/crustacea.special2012.7_59.

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