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Lineus longissimus

(Gunnerus, 1770)


Cynthia D. Trowbridge I was searching through old digital photos and just noticed this nemertean. It did not really look like Lineus longissimus to me (stripes so very pronounced) although at least one web site (http://www.seawater.no/fauna/nemertea/longissimus.html) exhibits the same degree of stripes. Any ideas? Just for general interest :-) I should have done a stylet examination but there was only so much time available :-)

Ian Smith Hi Cynthia D. Trowbridge I have just uploaded some images showing variations in colour of the same individual which depend on lighting and degree of extension. Cheers Ian Smith

Cynthia D. Trowbridge Thanks!

Message posted on Seasearch Identifications on 11 Jan 2013
George Brown Took this photo of Lineus longissimus last weekend but looking at the image later noticed about 30 tiny orange starfish grouped together. Each starfish is about 5 to 7mm in diameter. I thought starfish larvae formed part of the plankton as a dispersal strategy but does this species avoid that phase? East coast of Eilean nan Ron, north coast of Scotland, depth 4m. Photograph taken 14th April 2013.

David Kipling Asterina phylatica is a brooder - sits over the eggs on the rock until they hatch and metamorphose. The baby starfish then crawl out from under the arms. There's a short window in early summer when you can catch them doing this, do I'm reliably informed.

David Kipling *so

George Brown Is Asterina gibbosa a brooder? I've got to say that I've never seen an adult form of either species. Must try harder!

Keith Hiscock They look rather like the Luidia sarsi that I see in late summer floating about in their gelatinous sheaths in the plankton. The orange colour is very 'Luidia'. Could a swarm have settled together? More ideas needed. Thought about Porania but that has a brachiolaria larva that spends more than a month in the plankton and none of the pics (Google search) show a distinct starfish. If staying together in a swarm, could metamorphose into the little ones in the photo?

Message posted on Echinoderms of the NE Atlantic on 19 Apr 2013
Taxonomy
Animalia (Kingdom)
  Nemertea (Phylum)
    Anopla (Class)
      Heteronemertea (Subclass)
        Lineidae (Family)
          Lineus (Genus)
            Lineus longissimus (Species)
Associated Species