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Paraxenisthmus springeri, New Genus and Species of Gobioid Fish from the West Pacific, and Its Phylogenetic Position within the Xenisthmidae
Anthony C. Gill and Douglass F. Hoese
Vol. 1993, No. 4 (Dec. 28, 1993), pp. 1049-1057
Stable URL: http://www.jstor.org/stable/1447083
Page Count: 9
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Paraxenisthmus springeri is described from two specimens from the Solomon Islands. It is unique among xenisthmids in having: vomer with two separate patches of teeth; palatine with elongate patch of teeth; coronomeckelian bone present; dorsal postcleithrum present; ceratobranchial 5 broad; infrapharyngobranchial 2 broad, with two anterior cartilage heads and well-developed tooth patch; infrapharyngobranchial 4 present; infrapharyngobranchial 4 toothplate large; and basibranchial 3 present. Based on a cladistic analysis of osteological and external characters, Paraxenisthmus is the sister group of a monophyletic group that includes all other xenisthmid genera (Allomicrodesmus, Rotuma, Tyson and Xenisthmus). Further evidence is presented that Allomicrodesmus, Rotuma, and Tyson form the sister group of Xenisthmus.