Chileida
A rhynchonelliform class, characterised by the presence of a colleplax; closest relative (?): ''Salanygolina''.Holmer, L.E., Stolk, S.P., Skovsted, C.B., Balthasar, U., and Popov, L. (2009). The enigmatic early Cambrian ~Salanygolina~ - A stem group of rhynchonelliform chileate brachiopods? Palaeontology 52, 1–10. Salanygolina Thought to be a sister group. References Brachiopods {{paleo-protostome-stub ...
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Rhynchonelliformea
Rhynchonelliformea is a major subphylum and clade of brachiopods. It is equivalent to the former class Articulata, which was used previously in brachiopod taxonomy. Articulate 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 name, Rhynchoelliformea, which replaces Articulata, which is also a class of crinoids, comes from the family Rhynchonellidae, which however is no more representative of articulate brachiopods than any other group such as spirifers or strophomenids. It just happens to be the name chosen, based on an included taxon. The main difference between the Rhynchonelliformea described in the Treatise Part H, revised 2000/2007, and the Articulata of the Treatise part H, 1965, lies in the groups included, their taxonomic po ...
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