Terebratulida

Terebratulida Temporal range: Silurian–present PreꞒ Ꞓ O S D C P T J K Pg N
Terebratulid brachiopod from the Campanian (Upper Cretaceous) of southwestern France.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	Rhynchonellata
Order:	Terebratulida Waagen, 1883
Suborders
See text

Terebratulids are one of only three living orders of articulate

Terebratulids typically have biconvex shells that are usually ovoid to circular in outline. They can be either smooth or have radial ribbing. The lophophore support is loop shaped in contrast to the spiralia of similar looking spiriferids. Terebratulids are also distinguished by a very short hinge line, and the shell is punctate in microstructure. There is a circular pedicle opening, or foramen, located in the beak.

Terebratulids may have evolved from Atrypids during the early or Middle Silurian. Early genera were almost circular to elongate-oval, with smooth or finely costate shells. During the Cretaceous and Tertiary periods, many shells became coarsely plicate.

Classification

• Suborder Terebratellidina
  • Superfamily Kraussinoidea
  • Superfamily Laqueoidea
  • Superfamily Megathyridoidea
  • Superfamily Platidioidea
  • Superfamily Terebratelloidea
    • Family Dallinidae
    • Family Ecnomiosidae
    • Family Terebratellidae
    • Family
      Thaumatosiidae
  • Superfamily Zeillerioidea
  • Superfamily Bouchardioidea
  • Superfamily Gwynioidea
  • Superfamily Kingenoidea
  • Superfamily Incertae sedis
    • Family Tythothyrididae
• Suborder Terebratulidina
  • Superfamily Cancellothyroidea
    • Family Cancellothyrididae
    • Family Chlidonophoridae
    • Family Cnismatocentridae
  • Superfamily Dyscoloidea
  • Superfamily Terebratuloidea
    • Family Gryphidae
    • Family Tichosidae
    • Family Terebratulidae

Extinct Superfamilies

• • Superfamily Dielasmatoidea †
  • Superfamily Cryptonelloidea †
  • Superfamily Loboidothyridoidea †
  • Superfamily Stryingocephaloidea †

Gallery

• 
  Coenothyris oweni from the Middle Triassic (Anisian) lower Saharonim Formation, Har Gevanim, southern Israel.
• 
  d'Orbigny, 1849) from the Hauterivian

  (Lower Cretaceous) of Cehegin, Murcia, Spain. This terebratulid is characterized by a central perforation through its valves.
• 
  Terebratalia transversa, a living terebratulide
• 
  Calloria inconspicuo, a living terebratulide
• 
  Coptothyris grayi

  , a living terebratulide