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A new atlantasellid isopod (Asellota: Aselloidea) from the flooded coastal karst of the Dominican Republic (Hispaniola): evidence for an exopod on a thoracic limb and biogeographical implications

Published online by Cambridge University Press:  10 October 2001

Damià Jaume
Damià Jaume
Affiliation:
Instituto Mediterráneo de Estudios Avanzados (CSIC-UIB), C/ Miquel Marquès 21, 07190 Esporles, Mallorca, Spain. E-mail: [email protected]
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Abstract

A new representative of the thus far monotypic, Bermudan aselloid family Atlantasellidae is described from the freshwater layers of two coastal sinkholes on the south-west Dominican Republic, Hispaniola. Atlantasellus dominicanus sp. nov. is extraordinary among isopods in retaining a remnant of the exopod on one of its pereiopods; no other isopod is known to express a schizopodous condition of thoracic limbs. The locomotory behaviour, body volvation habits, and apparent specificity of the new taxon for life on submerged decaying wood in cave waters are described. Analysis of palaeogeographic and ecological evidence supports the interpretation of the Atlantasellidae as a thalassoid lineage, contrary to previous phylogenetically supported assumptions considering them to be an ancient, freshwater lineage.

Keywords

CrustaceaPeracaridaAtlantasellidaebiramous pereiopodsregression-model evolutionAntillean biogeography
Type
Research Article
Information
Journal of Zoology , Volume 255 , Issue 2 , October 2001 , pp. 221 - 233
Copyright
2001 The Zoological Society of London

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