Mussel of the

Page last updated
28 April 2006

Mussel of the Month

The May 2006 Mussel of the Month is Hyriopsis bialatus. Hyriopsis is widespread in southeastern Asia, from China and Japan south through Indochina to Borneo.

Hyriopsis bialatus
ANSP 331305. Lam Nam, Mun, Amphoe Phimai, Nakhon Ratchasima Province, Thailand.
Bill Heard, 11 July 1971!

The genus Hyriopsis consists of about eight species, the majority of which occur Indochina; a single species each also occurs on the islands of Japan and Borneo. Hyriopsis is valued for its use in the pearl industry. Hyriopsis was also included by Huang et al. (2002) in their study of Asian freshwater mussel phylogeny.


Phylum Mollusca
Class Bivalvia
Subclass Palaeoheterodonta
Order Unionoida

Superfamily Unionoidea Rafinesque, 1820

Family Unionidae s.s.

Genus Hyriopsis Conrad, 1853

Species Hyriopsis bialatus Simpson, 1900

For more information on Hyriopsis, check out:
  • Brandt, R.A.M. 1974. The non-marine aquatic Mollusca of Thailand. Archiv für Molluskenkunde 105(1-4):1-423.
  • Huang, Y.-Y., H.-Z. Liu, X.-P. Wu & S. Ouyang. 2002. Testing the relationships of Chinese freshwater Unionidae (Bivalvia) based on analysis of partial mitochondrial 16s rRNA sequences. Journal of Molluscan Studies 68(4): 359-363.
  • Liu, Y.-Y. 1979. Freshwater Mollusks. Economic Fauna of China. Science Press, Beijing, Peoples Republic of China.
  • American Museum of Natural History Pearls Exhibit. — Web site designed to accompany the widely traveled museum exhibition developed by the AMNH and the Field Museum of Natural History.
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