A new genus and species of barnacle (Cirripedia, Verrucomorpha) associated with vents of the Lau Back-Arc Basin: its gross morphology, inferred first juvenile stage and affinities

William A. NEWMAN

en Zoosystema 22 (1) - Pages 71-84

Published on 30 March 2000

Two specimens of a remarkable new neoverrucid and a few metamorphosing cyprid larvae containing its inferred first juvenile stage were found among the barnacles collected by the submersible Nautile during the BIOLAU Expedition (1989) to the Lau Back-Arc Basin, Tonga. The new form, Imbricaverruca yamaguchii n. gen. and n. sp., differs from the only previously known species, Neoverruca brachylepadoformis Newman, 1989, in having an operculum with a relatively large, permanent median latus and a reduced primary wall supported by relatively large, close-fitting, imbricating plates, the lowermost of which are apparently not deciduous. On the other hand, it has a superficial facies similarity with verrucids. However, its construction and inferred first juvenile stage are quite different whereby it appears to represent a relatively specialized neoverrucid rather than an evolutionary step leading to proverrucids and/or verrucids. The new form not only provides evidence that a significant diversification took place within the neoverrucids, it constitutes a significant addition to our knowledge of the vent-inhabiting cirriped fauna of the Lau Basin already considered the most diverse known in the world.


Vent fauna, thoracican first juveniles, systematics, evolution, biogeography.

Download full article in PDF format Order a reprint