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Pectinate claws in decapod crustaceans; convergence in four lineages

Decapod crustaceans bearing major claws with long, slender fingers armed with pectinate (comblike) denticles have been described in six genera arrayed within three families (Polychelidae, Nephropidae, and Ctenochelidae) in three infraorders (Palinura, Astacidea, and Anomura, respectively). Only one... Full description

Journal Title: Journal of paleontology 2000, Vol.74 (3), p.474-486
Main Author: Tshudy, Dale
Other Authors: Sorhannus, Ulf
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Alma/SFX Local Collection
Publisher: Paleontological Society
ID: ISSN: 0022-3360
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recordid: cdi_geoscienceworld_journals_2000_045717
title: Pectinate claws in decapod crustaceans; convergence in four lineages
format: Article
creator:
  • Tshudy, Dale
  • Sorhannus, Ulf
subjects:
  • adaptation
  • Arthropoda
  • biologic evolution
  • Cenozoic
  • cladistics
  • claws
  • Crustacea
  • faunal list
  • Invertebrata
  • invertebrate
  • Malacostraca
  • Mandibulata
  • Mesozoic
  • morphology
  • Paleontology
  • Paleozoic
  • Permian
  • phylogeny
  • Tertiary
ispartof: Journal of paleontology, 2000, Vol.74 (3), p.474-486
description: Decapod crustaceans bearing major claws with long, slender fingers armed with pectinate (comblike) denticles have been described in six genera arrayed within three families (Polychelidae, Nephropidae, and Ctenochelidae) in three infraorders (Palinura, Astacidea, and Anomura, respectively). Only one or a few genera in each infraorder exhibit this claw form. The pectinate claw form is confidently interpreted as having evolved independently in four lineages: once in the Polychelidae, once in the Ctenochelidae, and twice in the Nephropidae. Three of the lineages are known from both the fossil record and modern seas; the polychelid form is known only from Jurassic rocks. Convergence in this claw form developed to the extent that isolated fossil claws (i.e., claws without associated bodies) have commonly been misidentified at high taxonomic levels. The fossil record confirms what seems intuitively reasonable: that claw morphology is prone to convergence and should not, by itself, be given a high degree of taxonomic importance.
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0022-3360
fulltext: fulltext
issn:
  • 0022-3360
  • 1937-2337
url: Link


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titlePectinate claws in decapod crustaceans; convergence in four lineages
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descriptionDecapod crustaceans bearing major claws with long, slender fingers armed with pectinate (comblike) denticles have been described in six genera arrayed within three families (Polychelidae, Nephropidae, and Ctenochelidae) in three infraorders (Palinura, Astacidea, and Anomura, respectively). Only one or a few genera in each infraorder exhibit this claw form. The pectinate claw form is confidently interpreted as having evolved independently in four lineages: once in the Polychelidae, once in the Ctenochelidae, and twice in the Nephropidae. Three of the lineages are known from both the fossil record and modern seas; the polychelid form is known only from Jurassic rocks. Convergence in this claw form developed to the extent that isolated fossil claws (i.e., claws without associated bodies) have commonly been misidentified at high taxonomic levels. The fossil record confirms what seems intuitively reasonable: that claw morphology is prone to convergence and should not, by itself, be given a high degree of taxonomic importance.
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subjectadaptation ; Arthropoda ; biologic evolution ; Cenozoic ; cladistics ; claws ; Crustacea ; faunal list ; Invertebrata ; invertebrate ; Malacostraca ; Mandibulata ; Mesozoic ; morphology ; Paleontology ; Paleozoic ; Permian ; phylogeny ; Tertiary
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descriptionDecapod crustaceans bearing major claws with long, slender fingers armed with pectinate (comblike) denticles have been described in six genera arrayed within three families (Polychelidae, Nephropidae, and Ctenochelidae) in three infraorders (Palinura, Astacidea, and Anomura, respectively). Only one or a few genera in each infraorder exhibit this claw form. The pectinate claw form is confidently interpreted as having evolved independently in four lineages: once in the Polychelidae, once in the Ctenochelidae, and twice in the Nephropidae. Three of the lineages are known from both the fossil record and modern seas; the polychelid form is known only from Jurassic rocks. Convergence in this claw form developed to the extent that isolated fossil claws (i.e., claws without associated bodies) have commonly been misidentified at high taxonomic levels. The fossil record confirms what seems intuitively reasonable: that claw morphology is prone to convergence and should not, by itself, be given a high degree of taxonomic importance.
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jtitleJournal of paleontology
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abstractDecapod crustaceans bearing major claws with long, slender fingers armed with pectinate (comblike) denticles have been described in six genera arrayed within three families (Polychelidae, Nephropidae, and Ctenochelidae) in three infraorders (Palinura, Astacidea, and Anomura, respectively). Only one or a few genera in each infraorder exhibit this claw form. The pectinate claw form is confidently interpreted as having evolved independently in four lineages: once in the Polychelidae, once in the Ctenochelidae, and twice in the Nephropidae. Three of the lineages are known from both the fossil record and modern seas; the polychelid form is known only from Jurassic rocks. Convergence in this claw form developed to the extent that isolated fossil claws (i.e., claws without associated bodies) have commonly been misidentified at high taxonomic levels. The fossil record confirms what seems intuitively reasonable: that claw morphology is prone to convergence and should not, by itself, be given a high degree of taxonomic importance.
pubPaleontological Society
doi10.1666/0022-3360(2000)074<0474:PCIDCC>2.0.CO;2