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RE-EXAMINATION OF THE ZOEAL MORPHOLOGY OF CHASMAGNATHUS GRANULATUS, CYCLOGRAPSUS LAVAUXI, HEMIGRAPSUS SEXDENTATUS, AND H. CRENULATUS CONFIRMS CONSISTENT CHAETOTAXY IN THE VARUNIDAE (DECAPODA, BRACHYURA)

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[The morphology of first stage zoea larvae of four species of grapsoid crabs (viz., Chasmagnathus granulatus Dana, 1851, Cyclograpsus lavauxi H. Milne Edwards, 1853, Hemigrapsus crenulatus (H. Milne Edwards, 1837), and H. sexdentatus (H. Milne Edwards, 1837)) from Argentina and New Zealand was re-examined. Special attention was given to those characters that have been recently recognized to separate larvae of the families Sesarmidae and Varunidae. In all species studied, the setation of several appendages differed from that presented in the original descriptions of the larvae. The new chaetotaxy agrees well with expectations based on a recent taxonomic classification. The shared 2,2 setal pattern on the endopod of the maxilla and the same type of antenna and telson in all of these species, confirm a close phylogenetic relationship among them and their placement within the family Varunidae.

Die Morphologie des ersten Zoea-Larvalstadiums von vier Arten grapsoider Krabben (viz., Chasmagnathus granulatus Dana, 1851, Cyclograpsus lavauxi H. Milne Edwards, 1853, Hemigrapsus crenulatus (H. Milne Edwards, 1837) und H. sexdentatus (H. Milne Edwards, 1837)) aus Argentinien und Neuseeland wurde erneut untersucht. Besondere Aufmerksamkeit galt dabei den Charakteren, die kürzlich als trennende Merkmale für Larven der Familien Sesarmidae und Varunidae erkannt wurden. In allen untersuchten Arten unterschied sich die Beborstung mehrerer Extremitäten von der Originalbeschreibungen der Larven. Die neue Chaetotaxie stimmt mit Erwartungen überein, die auf einer kürzlich aufgestellten Taxonomie beruhen. Der 2,2-Beborstungstyp des Endopods der zweiten Maxille und die gleiche Form von Antenne und Telson in allen Arten bestätigt eine nahe phylogenetische Verwandtschaft dieser Arten und deren Zuordnung zur Familie Varunidae., The morphology of first stage zoea larvae of four species of grapsoid crabs (viz., Chasmagnathus granulatus Dana, 1851, Cyclograpsus lavauxi H. Milne Edwards, 1853, Hemigrapsus crenulatus (H. Milne Edwards, 1837), and H. sexdentatus (H. Milne Edwards, 1837)) from Argentina and New Zealand was re-examined. Special attention was given to those characters that have been recently recognized to separate larvae of the families Sesarmidae and Varunidae. In all species studied, the setation of several appendages differed from that presented in the original descriptions of the larvae. The new chaetotaxy agrees well with expectations based on a recent taxonomic classification. The shared 2,2 setal pattern on the endopod of the maxilla and the same type of antenna and telson in all of these species, confirm a close phylogenetic relationship among them and their placement within the family Varunidae.

Die Morphologie des ersten Zoea-Larvalstadiums von vier Arten grapsoider Krabben (viz., Chasmagnathus granulatus Dana, 1851, Cyclograpsus lavauxi H. Milne Edwards, 1853, Hemigrapsus crenulatus (H. Milne Edwards, 1837) und H. sexdentatus (H. Milne Edwards, 1837)) aus Argentinien und Neuseeland wurde erneut untersucht. Besondere Aufmerksamkeit galt dabei den Charakteren, die kürzlich als trennende Merkmale für Larven der Familien Sesarmidae und Varunidae erkannt wurden. In allen untersuchten Arten unterschied sich die Beborstung mehrerer Extremitäten von der Originalbeschreibungen der Larven. Die neue Chaetotaxie stimmt mit Erwartungen überein, die auf einer kürzlich aufgestellten Taxonomie beruhen. Der 2,2-Beborstungstyp des Endopods der zweiten Maxille und die gleiche Form von Antenne und Telson in allen Arten bestätigt eine nahe phylogenetische Verwandtschaft dieser Arten und deren Zuordnung zur Familie Varunidae.]

Affiliations: 1: Department of Biology, Laboratory for Crustacean Research, University of Louisiana at Lafayette, Lafayette, LA 70504-2451, U.S.A.; 2: Max-Planck-Institut für Verhaltensphysiologie, Postfach 1567, D-82305 Seewiesen, Germany

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/content/journals/10.1163/15685400152682656
2001-10-01
2016-08-26

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