Mussel of the

Page last updated
11 July 2016

Mussel of the Month

The July 2016 Mussel of the Month is Pressidens moellendorffi. Pressidens is a genus of three species from the islands of Borneo and Palawan (The Philippines).

Pressidens moellendorffi
SMF 3600. Palawan; Moellendorff! (type)

Pressidens is a genus about which we know very little. Google "Pressidens moellendorffi," and you will be asked if you mean "President Moellendorffi." Then, you will be linked to this this web site. If you try it with Google Scholar, you will find our global checklist (Graf & Cummings, 2007). All that anyone has really said about these freshwater mussels is that they exist, and there are some specimens to back that up.

There is still a lot of work left to do to fill in the details of freshwater mussel global diversity!


Phylum Mollusca
Class Bivalvia
Subclass Palaeoheterodonta
Order Unionoida

Family UNIONIDAE Rafinesque, 1820
Subfamily RECTIDENTINAE Modell, 1942

Genus Pressidens Haas, 1910

Species Pressidens moellendorffi Haas, 1910

To find out more about Pressidens and some of the works that have mentioned the genus:
  • Graf, D.L. & K.S. Cummings. 2007. Review of the systematics and global diversity of freshwater mussel species (Bivalvia: Unionoida). Journal of Molluscan Studies 73: 291-314.
  • Haas, F. 1969. Superfamilia Unionacea. Das Tierreich 88: 1-663.
  • Simpson, C.T. 1914. A descriptive catalogue of the naiades, or pearly fresh-water mussels. Parts I-III : 1540 pp.
  • Thiele, J. 1934. Handbuch der systematischen Weichtierkunde 3: 779-1022.
NSF icon MUSSEL icon
"Making the world a better place, one mollusk at a time."