{{Short description|Species of mollusc}} {{Speciesbox | image =Naturalis Biodiversity Center - RMNH.MOL.317073 - Idas simpsoni (Marshall, 1900) - Mytilidae - Mollusc shell.jpeg
|image_caption = Preserved specimen of Idas simpsoni | genus = Idas | species = simpsoni | authority = (Marshall, 1900)<ref name=WoRMS>{{cite WoRMS |author=Huber, Markus |year=2010 |title=''Idas simpsoni'' (J. T. Marshall, 1900) |id=140458 |access-date=2 February 2019}}</ref> | synonyms = {{species list | Myrina simpsoni | Marshall, 1900 | Adipicola simpsoni | (Marshall, 1900) }} | synonyms_ref = <ref name=WoRMS/> }}
''''' Idas simpsoni''''', previously known as ''Adipicola simpsoni'', is a species of saltwater clam, a marine bivalve mollusc in the family Mytilidae, the mussels. It is a deepwater species and is only found attached to the bones of dead whales.
==History== In 1900, some fishermen trawling the seabed between the Hebrides and the Shetland Islands brought to the surface part of a whale skull to which was attached about twenty bivalve molluscs. They passed their find to James Jenkins Simpson, a shell collector in Aberdeen, and he sent them on to the conchologist James Thomas Marshall.<ref name=Chambers>{{cite book|author=Chambers, Paul|title=British Seashells: A Guide for Collectors and Beachcombers|url=https://books.google.com/books?id=HijarheQvZwC&pg=PA126 |year=2009|publisher=Casemate Publishers |isbn=978-1-84468-051-1 |page=126}}</ref> Marshall determined that the molluscs were new to science, and formally described them, naming the new species ''Myrina simpsoni''.<ref name=WoRMS/> Apart from one specimen which was found inside a baulk of drifting pinewood, all specimens seen since then have been associated with the skeletons of dead whales, making this mollusc the first known species with such a restrictive habitat requirement.<ref name=Chambers/> The species has since been transferred to the genus ''Idas'', making it ''Idas simpsoni''.<ref name=WoRMS/>
==Description== This mollusc can grow to a length of about {{convert|2|cm|in|1|abbr=on}}. The shell is equivalved, oblong and rather fragile, the posterior end being broad and rounded while the anterior end is narrower and more acutely pointed. The dorsal margin is flat and the hinge simple; the shell is embossed with fine concentric sculpturing. The exterior of the shell is grey and the interior is pearly.<ref name=Chambers/>
==Ecology== A whale fall, the sinking of a dead whale carcase to the sea floor, creates a complex localized ecosystem that can supply sustenance to deep-sea organisms for long periods of time.<ref name = Lloyd>{{cite journal | last = Lloyd | first = Robin | year = 2007 | title = New Creature Found Living in Dead Whale | journal = LiveScience | url = http://www.livescience.com/animals/070518_anemone_whale.html | access-date = 2 March 2010 }}</ref> ''Idas simpsoni'' is described as living in abundance on weathered whale skulls.<ref>{{cite book|author1=Gibson, R.N.|author2=Atkinson, R.J.A.|title=Oceanography and Marine Biology, An Annual Review, Volume 41 |url=https://books.google.com/books?id=64crGFXWn5gC&pg=PA312 |year=2003 |publisher=CRC Press|isbn=978-0-203-18057-0 |page=312}}</ref>
==References== {{Reflist}}
{{Taxonbar|from=Q13358782}}
Category:Mytilidae Category:Molluscs of the Atlantic Ocean Category:Molluscs described in 1900