Abstract
A phylogenetic analysis of the Cirripedia family Oxynaspididae yields four monophyletic clades. These are designated as four genera, Oxynaspis Darwin, 1852, Archoxynaspis gen. nov., Pycnaspis gen. nov. and Minyaspis gen. nov. Five new species from Astrolabe Reef in Fiji (Oxynaspis perekrestenkoi sp. nov., O. joankovanae sp. nov., Minyaspis amylaneae sp. nov., M. opreskoi sp. nov. and M. welchi sp. nov.) and one from Palau (Oxynaspis joandianae sp. nov.) are described. A morphological character dataset and resulting phylogeny supporting the new generic divisions is presented. All but two of the 24 species previously known and all six of the newly described species are intimately associated with antipatharians. Pycnaspis connectens was described by Broch (1931) as “fixed to a silicious sponge.” A list of species’ ranges and their known hosts is presented. The earliest known possible antipatharian in the fossil record is Miocene, much later than the Eocene appearance of Archoxynaspis eocenica (Withers, 1935). Therefore, the symbiosis of oxynaspidids with antipatharians may have evolved only since the Miocene. However, given the dubious fossil record of antipatharians (known only from a single specimen of uncertain affinity from Miocene Italy) the time of the first antipatharian/oxynaspidid symbiosis is uncertain.
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