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2236 Views 4 Replies Last post: Aug 12, 2014 12:38 AM by Roger RSS
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Aug 9, 2014 12:20 PM

Bivalve ID

Hi Guys,


I have attached three photos of bivalve (about 10 mm shell length) which I thought under the genus Neotrigonia but I cannot distinguish the species name. These were taken from the Philippines. Any help on the correct identification of this species will be greatly appreciated.


Thanks in advance


  • Currently Being Moderated
    Aug 9, 2014 3:36 PM (in response to Roger)
    Re: Bivalve ID




    There may not be many specis to go at, but I don't have a key or other discriminatory information.



    Maybe these can help?


    - Cotton, B.C. (1961)

    'South Australian Mollusca. Pelecypoda. Handbook of the Flora and Fauna of South Australia Series'

    Adelaide; W.L. Hawes, Government Printer. pp.1,363

    Supposdly it has a key to Neotrigonia,albeit in South Australia.


    - Huber M. (2010)

    Compendium of bivalves. A full-color guide to 3,300 of the world’s marine bivalves. A status on Bivalvia after 250 years of research.'

    Hackenheim: ConchBooks. pp.901, 1 CD-ROM


    - Dr Markus Huber,

    University of Zurich; Faculty of Science; Institute of Evolutionary Biology and Environmental Studies (IEU)

    He has done some work on the species data in the World Register of Marine Species (




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  • Currently Being Moderated
    Aug 10, 2014 4:01 PM (in response to Roger)
    Re: Bivalve ID

    Neotrigonia are in the family Trigoniidae of which the  neotrigonia genus has the only living members, with 8 species,given in & shows 6 at

    another site,  is  Rotterdam museum (nmr-pics) which my McAfee rates as untested but rates 'translate this page' as safe. on LHS is list of families & selecting trigoniidae gives bednalli margaritacea & strangeii all with interiors (I also found interior of Lamarckii in Topseashells). This is the 1st concern as all these interiors were pearly & also the 'pleating' of the upper side showed through in the interior unlike yours. Also all 6 (plus gemma shown in ) have a distinctive straight edge in outline, unlike yours. Googling neotrigonia also turned up a paper "Neotrigonia, the sole surviving genus of the Trigoniidae..." 1984which gives the 1st page; it recognises only 6 sp's but says all are in waters adjacent to Australia, & gives a map supporting that distribution. The only species not illustrated is jacksoni (2011),presumably discovered 2011.

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      Aug 10, 2014 5:34 PM (in response to rhossilian)
      Re: Bivalve ID

      As the above implies Trigonia's v. unlikely (unless jacksoni is untypical), I was going to suggest looking in the above 3 sites (, nmr & Bagni Liggia) as well as femorale, ( ) at the (bivalve) families Cardiidae & Carditidae though I couldn't rule out similar shells being in other families; but then noticed a rather similar shell Timoclea sp's. (family Veneridae). Hence Timoclea in EOL , where eg looks very close

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