Cambrian origins and affinities of an enigmatic fossil group of arthropods

N. E. Vaccari (), G. D. Edgecombe and C. Escudero
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N. E. Vaccari: Universidad Nacional de Jujuy
G. D. Edgecombe: Australian Museum
C. Escudero: O'Higgins y Zarate

Nature, 2004, vol. 430, issue 6999, 554-557

Abstract: Abstract Euthycarcinoids are one of the most enigmatic arthropod groups, having been assigned to nearly all major clades of Arthropoda. Recent work has endorsed closest relationships with crustaceans1 or a myriapod–hexapod assemblage2, a basal position in the Euarthropoda3, or a placement in the Hexapoda4 or hexapod stem group5. Euthycarcinoids are known from 13 species ranging in age from Late Ordovician or Early Silurian to Middle Triassic, all in freshwater or brackish water environments6. Here we describe a euthycarcinoid from marine strata in Argentina dating from the latest Cambrian period, extending the group's record back as much as 50 million years. Despite its antiquity and marine occurrence, the Cambrian species demonstrates that morphological details were conserved in the transition to fresh water. Trackways in the same unit as the euthycarcinoid strengthen arguments that similar traces of subaerial origin from Cambro-Ordovician rocks were made by euthycarcinoids7,8. Large mandibles in euthycarcinoids6,9 are confirmed by the Cambrian species. A morphology-based phylogeny resolves euthycarcinoids as stem-group Mandibulata, sister to the Myriapoda and Crustacea plus Hexapoda.

Date: 2004
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DOI: 10.1038/nature02705

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