Protobranchia
Subclass of bivalves From Wikipedia, the free encyclopedia
Protobranchia is a subclass of bivalve molluscs.[1] It contains the extant orders Nuculanida, Nuculida, and Solemyida.
| Protobranchia | |
|---|---|
| |
| Two views of a left valve of Acila cobboldiae from the early Pleistocene of the Netherlands | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Subclass: | Protobranchia Pelseneer, 1889 |
| Orders | |
| Synonyms | |
|
Palaeotaxodonta | |
These are deep water clams of a small and primitive order with a taxodont hinge (composed of many similar, small teeth), generally with a central ligament pit, large labial palps which are used in deposit feeding and the gills used only for respiration, the anterior and posterior adductor muscles are nearly equal in size, a foot which is divided sagittally and longitudinally with papillate margins. The foot in Protobranchia clams is without a true byssus gland, although they frequently have a nonhomologous byssal gland in the heel. The byssal gland in these clams does not produce threads as in Pteriomorphia.[2]
2010 Taxonomy
In 2010 a new proposed classification system for the Bivalvia was published in by Bieler, Carter & Coan revising the classification of the Bivalvia, including the subclass Protobranchia.[3]
Subclass: Protobranchia
Order: Nuculanida[4]
- Superfamily: Nuculanoidea
- Family: Bathyspinulidae
- Family: Lametilidae accepted as Phaseolidae
- Family: Malletiidae
- Family: Neilonellidae
- Family: Nuculanidae
- Family: Siliculidae
- Family: Tindariidae
- Family: Yoldiidae
Order: Nuculida[5]
- Superfamily: Nuculoidea
- Family: Nuculidae
- Family: Sareptidae
Order: Solemyida[6]
- Superfamily: Manzanelloidea
- Family: Manzanellidae
- Family: Nucinellidae
- Superfamily: Solemyoidea
- Family: Solemyidae
Order: † Praecardiida
- Family: † Butovicellidae
- Genus: † Butovicella
- Family: † Praecardiidae
- Genus: † Slava
- Genus: † Cardiola
- Family: † Antipleuridae
- Genus: † Dualina
- Genus: † Hercynella
References
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