Athyridida

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Athyridida
Temporal range:
Lower Silurian - Early Jurassic
Fossil specimen of Uncites gryphus from Germany, Devonian age
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Brachiopoda
Class: Rhynchonellata
Order: †Athyridida
Boucot, Johnson & Staton 1964
Suborders

Athyridida is an order of Paleozoic brachiopods included in the Rhynchonellata, which makes up part of the articulate brachiopods.[1][2]

The Athyridida are the Rostrospracea of R.C Moore, 1952,[3] considered at that time to be a suborder of the Spiriferida. As with the Spiriferida, the Athyridida have outwardly directed spiral brachidia that support the lophophores on either side, but instead have non-plicate shells with rounded outlines and prominent beaks but almost no inner areas on the pedicle valve.

Athyridids began early in the

extinct at the end of the Permian[3] The order rejuvenated somewhat during the Triassic, only to decline again until becoming extinct in the Early Jurassic.[4]

Athyris, Composita, and Meristella are representative genera. Three suborders have been defined.

References

  1. ^ Classification des Brachiopoda
  2. ^ Athyridida-Paleodb
  3. ^ a b Moore, Lalcker and Fischer, 1952, Invertebrate Fossils, McGraw-Hill
  4. doi:10.1016/j.palaeo.2016.06.022
    . Retrieved 29 October 2022.



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