|Three valves of the peppery furrow shell, Scrobicularia plana|
|Family:|| Semelidae |
The Semelidae are a family of saltwater clams, marine bivalve molluscs in the order Cardiida.
Members of this family have rounded or oval, elongated shells, much flattened. The two valves are connected by an internal ligament in contrast to the closely related family Tellinidae where the ligament is external. The two separate siphons are very long, sometimes several times the length of the shell. These siphons have a characteristic cruciform muscle at their base.
Genera of Semelidae (with some notable species also listed) include:
Bulla is a genus of medium to large hermaphrodite sea snails, shelled marine opisthobranch gastropod molluscs. These herbivorous snails are in the suborder Cephalaspidea, headshield slugs, and the order Opisthobranchia.
Pholadidae, known as piddocks or angelwings, are a family of bivalve molluscs similar to a clam.
The Veneridae or venerids, common name: venus clams, are a very large family of minute to large, saltwater clams, marine bivalve molluscs. Over 500 living species of venerid bivalves are known, most of which are edible, and many of which are exploited as food sources.
Marginella is a genus of small tropical and temperate sea snails, marine gastropod molluscs in the family Marginellidae, the margin snails. It is the type genus of the family.
The Tellinidae are a family of marine bivalve molluscs of the order Cardiida. Commonly known as tellins or tellens, they live fairly deep in soft sediments in shallow seas and respire using long siphons that reach up to the surface of the sediment.
Buccinum is a genus of medium-sized sea snails, marine gastropod molluscs in the family Buccinidae, the true whelks.
Nucula is a genus of very small saltwater clams. They are part of the family Nuculidae.
Mactridae, common name the trough shells or duck clams, is a family of saltwater clams, marine bivalve mollusks in the order Venerida.
Nuculanidae is a family of small saltwater clams, marine bivalve molluscs in the order Nuculanida. Species in this family are found in all seas, from shallow to deep water.
Corbulidae is a family of very small saltwater clams, marine bivalve molluscs in the order Myida.
Lucinidae is a family of saltwater clams, marine bivalve molluscs.
Ungulinidae is a family of marine bivalve molluscs in the order Venerida.
Pandoridae is a taxonomic family of small saltwater clams, marine bivalves in the order Anomalodesmata.
Panopea is a genus of large marine bivalve molluscs or clams in the family Hiatellidae. There are 10 described species in Panopea. Many of them are known under the common name "geoduck".
Crepidula, commonly known as the slipper snails, slipper limpets, or slipper shells, is a genus of sea snails, marine gastropod mollusks in the family Calyptraeidae. This family includes the slipper snails (Crepidula), hat snails (Calyptraea), spiny slipper snails (Bostrycapulus), and cup-and-saucer snails (Crucibulum) as well as Crepipatella, Siphopatella, Grandicrepidula, and Maoricrypta.
Corbula is a genus of very small saltwater clams, marine bivalve molluscs in the family Corbulidae, the basket clams.
Abra is a genus of saltwater clams, marine bivalve mollusks in the family Semelidae. Members of this genus are mostly under 1.5 centimeters long, and have thin shells which are usually white. These bivalves normally live under the surface of sandy and muddy sediments, in the neritic zone.
Thracia is a genus of bivalve mollusc in the family Thraciidae.
Cumingia is a genus of marine clams in the family Semelidae. It is also represented in the fossil record.