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Short description: Order of bivalves

Temporal range: Tremadocian–0[1]
Wood1815 General Conchology pl 18 fig 1 Thracia convexa.png
Thracia convexa
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subterclass: Heterodonta
Superorder: Anomalodesmata
Dall, 1889

See text



Anomalodesmata is an superorder of saltwater clams, marine bivalve molluscs.[2] This grouping was formerly recognised as a taxonomic subclass. It is called a superorder in the current World Register of Marine Species, despite having no orders, to parallel it with sister taxon Imparidentia, which does have orders.[3]


The shells of species in this order are of equal size, as are the muscles that hold them closed, and the margins at the hinges are thickened. The margins of the mantle are also fused, and there is only a single hinge tooth, if any.[4]


In 2010, a new proposed classification system for the Bivalvia was published in Malacologia by Bieler, Carter & Coan revising the classification of the Bivalvia, including the order Anomalodesmata.[5] The following tree is their info which has been updated with the latest information from the World Register of Marine Species:

Order: Anomalodesmata


  1. Sánchez, T. M.; Vaccari, N. E. (2003). "Ucumariidae new family (Bivalvia, Anomalodesmata) and other bivalves from the Early Ordovician (Tremadocian) of northwestern Argentina". Ameghiniana 40 (3): 415–424. 
  2. World Register of Marine Species link: Anomalodesmata Dall, 1889 (+species list)
  3. World Register of Marine Species link: Imparidentia Bieler, P. M. Mikkelsen & Giribet, 2014 (+species list)
  4. Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 431. ISBN 0-03-056747-5. 
  5. 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
  • Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN:0-00-216906-1

External links

Wikidata ☰ Q567567 entry