Trigoniida

Trigoniida Temporal range: Devonian–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Subclass:	Palaeoheterodonta
Order:	Trigoniida Lamarck, 1819
Families
See text
Synonyms
Trigonioida

Trigoniida is an order of medium-sized saltwater clams, marine bivalve molluscs. Within the fossil record the occurrence of this order is widespread, ranging from the Devonian Period to Recent.

The diagnostic feature for the order is the unique and complex dentition of the shell, (i.e. the interior hinge teeth that articulate the two valves). The dentition is particularly elaborate within the family Trigoniidae.

Bieler, Carter, & Coan (2010) included the following families and superfamilies in Trigoniida.^[1] Taxa marked with a † are extinct with the only extant family in the order being Trigoniidae.

Trigoniida

• † Liu & Gu, 1988
  • † Liu & Gu, 1988
• † Van Hoepen, 1929
  • †Megatrigoniidae Van Hoepen, 1929
  • † Savelive, 1958
  • † Van Hoepen, 1929
• † Kobayashi, 1954
  • † Kobayashi, 1954
  • † Leanza, 1993</small
  • † Savelive, 1958
  • † Kobayashi, 1954
• Trigonioidea Lamarck, 1819
  • Trigoniidae Lamarck, 1819
  • † Newell & Boyd, 1975 (syn: Curtonotidae)
  • † Pérez, Reyes, & Danborenea 1995
  • † Bronn, 1849 (syn: Cytherodontidae, Costatoriidae, Gruenewaldiidae)
  • † Kobayashi, 1954
  • † Newell & Ciriacks, 1962
  • † Newell & Boyd, 1975
  • † Pojeta & Zhang, 1984

References[]

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