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Integrative systematics of northern and Arctic nudibranchs of the genus Dendronotus (Mollusca, Gastropoda), with descriptions of three new species
Ekimova, I.; Korshunova, T.; Schepetov, D.; Neretina, T.; Sanamyan, N.; Martynov, A. (2015). Integrative systematics of northern and Arctic nudibranchs of the genus Dendronotus (Mollusca, Gastropoda), with descriptions of three new species. Zool. J. Linn. Soc. 173(4): 841–886. http://dx.doi.org/10.1111/zoj.12214
In: Zoological Journal of the Linnean Society. Academic Press: London. ISSN 0024-4082; e-ISSN 1096-3642, more
Peer reviewed article  
Available in  Authors 
Keywords
    Biogeny > Ontogeny
    Classification > Taxonomy
    Molluscs
    Morphology
    Phylogenetics
    Marine/Coastal
Author keywords
    Molecular analysis
Authors  Top 
  • Ekimova, I.
  • Korshunova, T.
  • Schepetov, D.
  • Neretina, T.
  • Sanamyan, N.
  • Martynov, A.
Abstract
    The taxonomy of common northern nudibranch molluscs of the genus Dendronotus in the vast cold regions of Eurasia remains largely unknown. Abundant material collected in many localities from the Barents Sea, via the Arctic region, to the north-west Pacific was analysed for the first time. An integrated approach combining morphological and ontogenetic data with molecular four-gene (COI, 16S, H3, and 28S) analysis reveals seven species, including three previously undescribed. Dendronotus frondosus (Ascanius, 1774) and Dendronotus dalli Bergh, 1879 were commonly considered as amphiboreal species; however, according to this study they are restricted to the North Atlantic and the North Pacific, respectively. In the north-west Pacific two new species were discovered, Dendronotus kamchaticus?sp.?nov. and Dendronotus kalikal?sp.?nov., that are externally similar to D.?frondosus, but that show significant distance according to molecular analysis and are considerably different in radular morphology. In the North Atlantic a new species Dendronotus niveus?sp.?nov., sibling to North Pacific D.?dalli, is revealed. The separate status of North Atlantic Dendronotus lacteus (Thompson, 1840) is confirmed, including considerable range extension. The essential similarity of early ontogenetic stages of radular development common for species with disparate adult radular morphology (such as D.?frondosus and D.?dalli) is shown, and its importance for taxonomy is discussed
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