Kutorginata

Kutorginata
Temporal range: Cambrian Series 2– Miaolingian[1] (Atdabanian–Amgaian)
Kutorgina cingulata, a kutorginid from the lower Cambrian of Canada. Seen looking onto the ventral valve (left), dorsal valve (right), and the side (top)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Brachiopoda
Class: †Kutorginata
Williams et al., 1996
Order: †Kutorginida
Kuhn, 1949
Subgroups

See text.

Kutorginates (Kutorginata) are an extinct class of early rhynchonelliform ("articulate") brachiopods. The class contains only a single order, Kutorginida (kutorginides).[2] Kutorginides were among the earliest rhynchonelliforms, restricted to the lower-middle part of the Cambrian Period ("Atdabanian" [stage 3] to "Mayan" [late Miaolingian]).[3]

Despite this short span of time, kutorginides were still a major order of Cambrian rhynchonelliforms during the lower Cambrian.[1] Kutorginide diversity was highest up to the "Toyonian", though they began to decline in the mid-Cambrian even as other brachiopod orders (particularly orthides and acrotretides) diversified. A similar pattern of diversity loss is seen in obollelides, naukatides, and chileides, three other early rhynchonelliform orders contemporary with kutorginides.[3]

  1. ^ a b Cite error: The named reference Holmer2017 was invoked but never defined (see the help page).
  2. ^ Popov, Leonid E.; Williams, Alwyn (2000). "Chapter 2 (part): Kutorginata". In Kaesler, Roger L. (ed.). Part H, Brachiopoda (Revised). Volumes 2 & 3: Linguliformea, Craniiformea, and Rhynchonelliformea (part). Treatise on Invertebrate Paleontology. Boulder, Colorado; Lawrence, Kansas: Geological Society of America; University of Kansas. pp. 208–215. ISBN 0-8137-3108-9.
  3. ^ a b Curry, Gordon B.; Brunton, Howard C. (2007). "Chapter 9: Stratigraphic Distribution of Brachiopods". In Selden, Paul A. (ed.). Part H, Brachiopoda (Revised). Volume 6: Supplement. Treatise on Invertebrate Paleontology. Boulder, Colorado; Lawrence, Kansas: Geological Society of America; University of Kansas. pp. 2901–2965. ISBN 978-0-8137-3136-0.