PHYLOGENY OF THE GENUS ROSTANGA (NUDIBRANCHIA), WITH DESCRIPTIONS OF THREE NEW SPECIES FROM SOUTH AFRICA |
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Authors: | GAROVOY JOCELYN B; VALDES ANGEL; GOSLINER TERRENCE M |
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Institution: |
Department of Invertebrate Zoology and Geology, California Academy of Sciences, Golden Gate Park, San Francisco, California 94118, USA |
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Abstract: | Rostanga elandsia sp. nov., Rostanga aureamala sp. nov. andRostanga
phepha sp. nov. are characterized by having the radulawith slender
innermost lateral teeth, which lack denticles onthe inner side of the
cusp and have a single denticle on theouter side. The outermost
lateral teeth of these three speciesare elongate, but shorter than in
other species of the genus.In addition, R. aureamala is the only
species of the genus withrachidian teeth and R. phepha is unique
within the genus Rostanga byvirtue of its white coloration with dark
spots. A phylogenetic analysis shows that the three new species fromSouth
Africa and Rostanga setidens (Odhner, 1939) are the sistergroup of
the rest of the genus. The species from Japan and MarshallIslands
(North Pacific Ocean) are basal in the sister cladecontaining the
other species of Rostanga Bergh, 1879. The tropicalIndo-Pacific
species of Rostanga are not monophyletic. The Atlanticand Eastern
Pacific species form a monophyletic, derived clade,being the sister
group of Rostanga australis Rudman & Avern,1989, which has a narrow
range restricted to south eastern Australia.The widespread
Indo-Pacific species Rostanga bifurcata Rudman& Avern, 1989, is the
sister group of Rostanga dentacus Rudman& Avern, 1989, also widesprad in the tropical western Pacific. This phylogeny suggest s a viariant origin of the Sourth African,
Atlantic-EasternPacific, and probably North Pacific species, whereas
in thetropical Indo-Pacific most sister speceis are sympatric. (Received 16 May 1999; accepted 31 July 2000) |
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Keywords: | |
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