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Phylogenetic implications of the Crustacean nauplius

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Abstract

The plesiomorphic mode of crustacean development is widely accepted to be via a larva called the nauplius. Extant taxa like the Cephalocarida, Branchiopoda, Ostracoda, Mystacocarida, Copepoda, Cirripedia, Ascothoracida, Facetotecta, Euphausiacea and Penaeidea hatch from an egg as a free-living nauplius. Other crustaceans show an embryonic phase of development suggestive of a naupliar organization. Several features of the nauplius larva have been proposed as diagnostic characters for the Crustacea: a median (nauplius) eye; at least three pairs of head appendages (antennules, antennae, mandibles); a posteriorly directed fold (the labrum) extending over the mouth and a cephalic (nauplius) shield. The relationship between trilobite protaspis with at least four appendages and the crustacean nauplius remains unclear, but reports of a copepod orthonauplius with four appendages are rejected. Swimming is suggested to represent the underived mode of locomotion for the crustacean nauplius, and that naupliar swimming directly results in naupliar feeding which also is underived.

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  1. Fachbereich Biologie, AG Zoosystematik und Morphologie, Universität Oldenburg, D-26111, Oldenburg, Germany

    Hans-U. Dahms

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Dahms, HU. Phylogenetic implications of the Crustacean nauplius. Hydrobiologia 417, 91–99 (2000). https://doi.org/10.1023/A:1003886818724

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