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Chan, J. M.; Gosliner, T. M. (2007). Preliminary phylogeny of Thordisa (Nudibranchia: Discodorididae) with descriptions of five new species. The Veliger. 48(4): 284-308.
140418
Chan, J. M.; Gosliner, T. M.
2007
Preliminary phylogeny of <i>Thordisa</i> (Nudibranchia: Discodorididae) with descriptions of five new species
The Veliger
48(4): 284-308
Publication
Stated date: 25 January 2007
Available for editors  PDF available [request]
The systematics and phylogeny of the genus Thordisa from the tropical Indo-Pacific and eastern Pacific are revised. Morphological and anatomical data from Thordisa species were used to construct a preliminary phylogeny. The phylogenetic analysis demonstrates the monophyly of Thordisa and its relationship to the outgroups Asteronotus, Halgerda, and Hoplodoris. Five new species are described anatomically. Two of the species, Thordisa luteola sp. nov., known only from tropical South Africa and Thordisa nieseni sp. nov., from Costa Rica and Panama, are highly derived in several aspects of their morphology. Of the remaining three species, Thordisa albomaculata [sic, albomacula in main text] sp. nov. and Thordisa tahala, both widespread in the Indo-Pacific, appear to be sister species to Thordisa setosa Pease, 1860, known only from the Hawaiian Islands. Thordisa oliva sp. nov., from the tropical Indian Ocean of South Africa and Japan, appears to be sister to Thordisa diuda Marcus 1955, from Brazil. These two species share a unique apomorphy of having a pair of circular pits on the sides of the mouth.
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