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Pectinate claws in decapod crustaceans; convergence in four lineages

Dale Tshudy and Ulf Sorhannus
Pectinate claws in decapod crustaceans; convergence in four lineages
Journal of Paleontology (May 2000) 74 (3): 474-486

Abstract

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.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 74
Serial Issue: 3
Title: Pectinate claws in decapod crustaceans; convergence in four lineages
Affiliation: Edinboro University of Pennsylvania, Department of Geosciences, Edinboro, PA, United States
Pages: 474-486
Published: 200005
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 67
Accession Number: 2000-045717
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 2 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200015
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