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
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 (http://www.marinespecies.org/index.php)
Neotrigonia are in the family Trigoniidae of which the neotrigonia genus has the only living members, with 8 species,given in http://en.wikipedia.org/wiki/Neotrigonia & conchology.be shows 6 at http://www.conchology.be/?t=65&family=TRIGONIIDAE
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 http://www.bagniliggia.it/WMSD/HtmFamily/TRIGONIIDAES.htm ) 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, & http://www.gbif.org/species/4595111 gives a map supporting that distribution. The only species not illustrated is jacksoni (2011),presumably discovered 2011.
As the above implies Trigonia's v. unlikely (unless jacksoni is untypical), I was going to suggest looking in the above 3 sites (conchology.be, nmr & Bagni Liggia) as well as femorale, ( http://www.femorale.com/shellphotos/ ) 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 http://eol.org/pages/51296/media , where eg http://media.eol.org/content/2014/05/31/12/45882_orig.jpg looks very close
Thank you very much for all these suggestions and links. From the photos in the web, I agree that my specimen's inner appearance is different with Neotrigonia.
Recently, I received an email suggesting that the species belongs to family Veneridae, and could be Timoclea imbricata. I am trying to search for the photo of the species but could not find one at the moment. I will keep you posted once I get one.