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Review of Acanthodoris Gray, 1850 with a Phylogenetic Analysis of Onchidorididae Alder and Hancock, 1845 (Mollusca, Nudibranchia)


The phylogenetic relationships of Acanthodoris Gray, 1850 within the Onchidorididae are examined based upon morphological characters. The present phylogenetic analysis supports the monophyly of Acanthodoris. Most of the described species of Acanthodoris and a newly described species from South Africa are examined. Species included in the present analysis are: Acanthodoris brunnea, A. falklandica, A. hudsoni, A. lutea, A. nanaimoensis, A. nanega, A. pilosa, A. pina, A. rhodoceras and A. serpentinotus. The new species has some external similarities to Acanthodoris pilosa (Abildgaard in Mueller, 1789) from the East Coast of North America and to Acanthodoris lutea MacFarland, 1925 from the West Coast of North America. Differences in the reproductive and radular morphology distinguish this new species. Reproductive differences in the new species include a shorter deferent duct, vaginal duct and receptaculum seminis duct than found in other externally similar species. Radula differences include multifid jaw rodlets and 6 or 7 elongate, pointed outer lateral teeth in the new species. This is in contrast to the triangular hook-like jaw structures and 5 or 6 flattened, triangular outer lateral plates in A. lutea. Acanthoris pilosa has no jaw rods and 3 flat outer lateral plates. Phylogenetic analyses place the new species in a relatively basal position to the remaining Acanthodoris species and closely related to Acanthodoris falklandica Eliot, 1907 from South America and Acanthodoris nanega Burn, 1969 from South Australia. The species from the West Coast of North America and the North Atlantic, i.e., A. pilosa, form a derived clade, separate from the Southern Hemisphere species. The phylogenetic relationships among the Onchidorididae are presented. Morphological characters of several species from the currently recognized family group are examined. Taxa included in the analysis are: Adalaria jannae Millen, 1987, Adalaria loveni (Alder and Hancock, 1862), Adalaria proxima (Alder and Hancock, 1854), Calycidoris guentheri Abraham, 1876, Diaphorodoris luteocincta Iredale and O'Donoghue, 1923, Diaphorodoris lirulatocauda Millen, 1985, Diaphorodoris mitsuii (Baba, 1938), Diaphorodoris papillata Portmann and Sandmeier, 1960, Onchidoris bilamellata (Linnaeus, 1767) Onchidoris muricata (Mueller, 1776) and the Acanthodoris species listed above. Characters for the phylogenetic analysis are taken from the literature and from dissection of specimens when available. Characters were polarized using Bathydoris clavigera Thiele, 1912, Akiodoris salacia Millen, 2005 and Cadlina luteomarginata MacFarland, 1966. The phylogeny supports the monophyly of Adalaria and Onchidoris both situated in a basal clade to Acanthodoris. In addition, Calycidoris is basally situated to the clade containing the monophyletic Diaphorodoris, sister taxa to the clade of Goniodoris plus Okenia.......

【作者名称】: Shireen J. Fahey, Angel Valdes
【作者单位】: California Academy of Sciences 875 Howard Street San Francisco, California 94103, USA
【关 键 词】: Review of Acanthodoris Gray, 1850 with a Phylogenetic Analysis of Onchidorididae Alder and Hancock, 1845 (Mollusca, Nudibranchia)
【期刊名称】: Proceedings of the California Academy of Sciences
【期刊论文数据库】: [DBS_Articles_01]
【期刊论文编号】: 107,248,792
【摘要长度】: 2,894
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