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Genetics do not reflect habitat differences in Riseriellus occultus (Heteronemertea, Nemertea) from Spain and Wales
Sundberg, P.; Strand, M. (2007). Genetics do not reflect habitat differences in Riseriellus occultus (Heteronemertea, Nemertea) from Spain and Wales. Mar. Biol. Res. 3(2): 117-122
In: Marine Biology Research. Taylor & Francis: Oslo; Basingstoke. ISSN 1745-1000, more
Peer reviewed article  

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Keywords
    DNA; Mitochondria; Taxonomy; Riseriellus occultus Rogers, Junoy, Gibson & Thorpe, 1993 [WoRMS]; ANE, British Isles, Wales, Gwynedd, Llandudno [Marine Regions]; ANE, Spain, Galicia, Ria de Foz [Marine Regions]; Marine

Authors  Top 
  • Sundberg, P.
  • Strand, M.

Abstract
    The description of the heteronemertean species Riseriellus occultus was based on specimens from Spain, where they live imbedded in sand, and Wales, where the specimens were collected intertidally under stones and rocks. Considering these habitat differences, which are not known from any other nemertean conspecifics, we asked if this instead is an example of two sibling species that could not be separated by morphology. We sequenced specimens for the two mitochondrial genes cytochrome oxidase I (COI) and 16S and estimated an intraspecific phylogenetic network using statistical parsimony. This analysis did not disclose any differences congruent with geography/habitat; neither did the phylogenetic analysis using maximum likelihood. The phylogenetic analysis also included new sequences of Lineus longissimus, a species with many external characters in common with Riseriellus occultus;

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