Propeamussiidae Explained

Propeamussiidae, sometimes referred to as glass scallops mud scallops or mud pectens, are a taxonomic family of saltwater clams, marine bivalve molluscs in the order Pectinida.^[1] As members of the superfamily Pectinoidea, they are closely related to scallops. Extant species are small in size, poorly known, and inhabit deep waters. None of the species within this family has a common name.

Valves of these animals are fragile, either equivalved or nearly so, small to medium-sized, and are described as subcircular to obscurely ovate in shape. Like other scallops, the valves have pronounced "ears" on the anterior and posterior sides of the hinge joint. Valves are also very nearly equilateral. All species have a byssal notch which will vary with depth of species.^[2]

Fossil species of these epifaunal carnivores lived from the Triassic period to the Quaternary period (242.0 to 0.0 Ma). The majority of fossils of this family are distributed throughout Europe and North America.^[3]

Genera

Genera within the family Propeamussidae include:

Catillopecten Catillopecten eucymatus (Dall, 1898) Cyclopecten Cyclopecten culebrensis (E. A. Smith, 1885) Cyclopecten falklandicus Cyclopecten gaussianus Cyclopecten graui Knudsen, 1970 Cyclopecten hexagonalis Cyclopecten imbrifer (Lovén, 1846) Cyclopecten leptaleus (A. E. Verrill, 1884) Cyclopecten multistriatus Linse, 2002 Cyclopecten nanus A. E. Verrill & Bush in A. E. Verrill, 1897 Cyclopecten pustulosus (A. E. Verrill, 1873) Cyclopecten ringnesia (Dall, 1924) Cyclopecten reticulus (Dall, 1886) Cyclopecten simplex A. E. Verrill, 1897 Cyclopecten strigillatus (Dall, 1889) Cyclopecten subhyalinus (E. A. Smith, 1885) Cyclopecten thielei Cyclopecten transenna

†Filamussium Waller, 2006 Parvamussium Sacco, 1897 Parvamussium marmoratum (Dall, 1881) Parvamussium obliquum E. A. Smith, 1885 Parvamussium thalassinus (Dall, 1886) Parvamussium cancellatum (E. A. Smith, 1885) Propeamussium de Gregorio 1884 Propeamussium dalli (E. A. Smith, 1885) Propeamussium holmesii (Dall, 1886) Propeamussium octodecimliratum Melvill & Standen, 1907 Propeamussium pourtalesianum (Dall, 1886) Propeamussium sayanum (Dall, 1886) Propeamussium squamigerum (E. A. Smith, 1885) Similipecten Winkworth 1932 Similipecten groenlandicus (G. B. Sowerby II, 1842) Similipecten redferni Dijkstra, 2002 Similipecten similis (Laskey, 1811)

Notes and References

1. https://www.biolib.cz/en/taxon/id17597/ Biolib
2. Book: John Wesley Tunnell. Encyclopedia of Texas Seashells: Identification, Ecology, Distribution, and History. 2010. Texas A&M University . 978-1-60344-337-1. 329.
3. http://www.fossilworks.org/cgi-bin/bridge.pl?action=home The Paleobiology Database