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Journal of Molluscan Studies Advance Access





Published: Fri, 08 Sep 2017 00:00:00 GMT

Last Build Date: Fri, 08 Sep 2017 09:48:31 GMT

 



Integrative taxonomy of the Felimare californiensis and F. ghiselini species complex (Nudibranchia: Chromodorididae), with description of a new species from Peru

2017-09-08

ABSTRACT
A combination of molecular, biogeographic and morphological data indicates that the eastern Pacific species Felimare ghiselini is a synonym of F. californiensis, also recorded from this region. However, a disjunct population from Peru, previously considered to be F. ghiselini, represents a distinct species, formally described herein as F. sechurana. Although previous work recognized that F. californiensis had a disjunct range with populations on the Pacific coast of North America and in the Gulf of California, the synonymization with F. ghiselini extends the range of this species into the southern part of the Gulf of California and also to Clipperton Island. Consequently, F. californiensis can now be stated to be common in the southern Gulf of California, minimizing concerns about the conservation status of this species. A latitudinal gradient in morphology is discussed. Speciation between F. californiensis and F. sechurana is hypothesized to be the result of dispersal of members of an ancestral population across the tropical eastern Pacific during the repeated periods of glaciation during the Pleistocene, followed by isolation. These results are consistent with a pattern of antitropical speciation that may have shaped biodiversity patterns across the eastern Pacific Ocean.



Unique pleuroproctic taxa of the nudibranch family Aeolidiidae from the Atlantic and Pacific Oceans, with description of a new genus and species

2017-09-08

Abstract
Morphological and molecular data on a deep-sea pleuroproctic taxon of the family Aeolidiidae from the Barents Sea (subarctic North Atlantic) are presented for the first time. Zeusia n. gen. is established for the North Atlantic and North Pacific pleuroproctic species of the family Aeolidiidae with two species: Z. hyperborea n. sp. and Z. herculea (Bergh, 1894) n. comb. Zeusia was recovered as sister to the genus Aeolidia in molecular analyses. The two included species of Zeusia share the potential synapomorphies of very large seminal receptacle and long vas deferens. A pleuroproctic anal opening is an important basal character of the group Nudibranchia and the family Aeolidiidae is discussed in the light of the present discovery.