Poromyidae is a family of saltwater clams, marine bivalve molluscs in the order Anomalodesmata. The genus Dilemma, described in 2008, is remarkable for being a predator of copepods, which is very unusual for a sessile mollusc.Leal J. H. (2008). "A remarkable new genus of carnivorous, sessile bivalves (Mollusca: Anomalodesmata: Poromyidae) with descriptions of two new species". Zootaxa 1764: 1–18. PDF fulltext
Genera and species Genera and species within the family Poromyidae include:
Cetomya Dall, 1889 Dermatomya Dall, 1889 Dermatomya buttoni Dall, 1916 Dermatomya mactroides (Dall, 1889) Dilemma Leal, 2008 Lissomya Krylova, 1997 Poromya Forbes, 1844 Poromya albida Dall, 1886 Poromya beringiana (Dall, 1916) Poromya elongata Dall, 1886 Poromya granulata (Nyst and Westendorp, 1839) Poromya houbricki Bernard, 1989 Poromya laevis E. A. Smith, 1885 Poromya leonina (Dall, 1916) Poromya malespinae (Ridewood, 1903) Poromya neaeroides Sequenza, 1876 Poromya neozelanica (Dell, 1956) Poromya rostrata Rehder, 1943 Poromya tenuiconcha (Dall, 1913) Poromya tornata (Jeffreys, 1876) Poromya trosti Strong and Hertlein, 1937
References
Sasaki T. & Leal J. H. (2008). "Dilemma japonicum new species (Bivalvia: Anomalodesmata: Poromyidae): A new record of the genus from the Northwest Pacific". The Nautilus 122: 166-170. PDF fulltext Powell A. W. B. (1979). New Zealand Mollusca. William Collins Publishers Ltd, Auckland, New Zealand.