Rhynchonelliformea

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Rhynchonelliformea Temporal range: 530–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Lower Cambrian to Recent
Burmirhynchia jirbaensis, a rhynchonellide from the Jurassic of Israel
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Brachiopoda
Subphylum:	Rhynchonelliformea Williams, Carlson, Brunton, Holmer & Popov, 1996
Classes
†Chileata †Kutorginata †Obolellata †Strophomenata Rhynchonellata

Rhynchonelliformea is a major subphylum and clade of brachiopods. It is roughly equivalent to the former class Articulata, which was used previously in brachiopod taxonomy up until the 1990s. These so-called articulated brachiopods have many anatomical differences relative to "inarticulate" brachiopods of the subphyla Linguliformea and Craniformea. Articulates have hard calcium carbonate shells with tongue-and-groove hinge articulations (hence the name) and separate sets of simple opening and closing muscles.

The Rhynchonelliformea (as described in the Treatise Part H, revised 1997–2007) is divided into five classes: Obolellata, Kutorginata, Chileata, Strophomenata, and Rhynchonellata. The Rhynchonellata are found living today, as the major constituent of modern brachiopod faunas. The other classes are all extinct: the Obolellata and Kutorginata are restricted to the Cambrian, while the Chileata and Strophomenata range through most of the Paleozoic.