Protobranchia

Protobranchia is a subclass of bivalve molluscs.[1] It contains the extant orders Nuculanida, Nuculida, and Solemyida.

Not to be confused with Prosobranchia.

Protobranchia
Two views of a left valve of Acila cobboldiae from the early Pleistocene of the Netherlands
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Protobranchia
Pelseneer, 1889
Orders

Nuculanida
Nuculida
Solemyida

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]

Order: Nuculida[5]

Order: Solemyida[6]

Order: † Praecardiida
  • Family: † Butovicellidae
    • Genus: † Butovicella
  • Family: † Praecardiidae
  • Family: † Antipleuridae
gollark: The main problem I envision is that I haven't worked out a standard for dimension naming, so it just uses the one it receives the most fixes containing, which can be basically anything the GPS servers want, and that it won't function reliably without a large amount of dimension-enabled GPS servers.
gollark: I've patched dimension support into the GPS libraries in potatOS and my trilaterating GPS server. Would people be interested in dimension support in GPS and/or should I PR it into CC: Tweaked?
gollark: `shell.exit()`
gollark: PotatOS actually had termination completely broken for... probably a few months... and somehow I didn't notice for ages and neither did anyone else.
gollark: What if they just terminate it?

References
  1. Protobranchia Pelseneer, 1889. Retrieved through: World Register of Marine Species on 8 July 2010.
  2. Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 340. ISBN 0-03-056747-5.
  3. Bieler, R., Carter, J.G. & Coan, E.V. (2010) Classification of Bivalve families. Pp. 113-133, in: Bouchet, P. & Rocroi, J.P. (2010), Nomenclator of Bivalve Families. Malacologia 52(2): 1-184
  4. Nuclanoida Carter, D.C. Campbell & M.R. Campbell, 2000. Retrieved through: World Register of Marine Species on 9 October 2010.
  5. Nuculida Dall, 1889. Retrieved through: World Register of Marine Species on 20 September 2010.
  6. Solemyoida Dall, 1889. Retrieved through: World Register of Marine Species on 9 July 2010.
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