|
Ceraurinella
''Ceraurinella'' is an extinct genus of trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ... in the family Cheiruridae. There are about 19 described species in ''Ceraurinella''. Species These 19 species belong to the genus ''Ceraurinella'': * † ''Ceraurinella arctica'' Ludvigsen, 1979 * † ''Ceraurinella brevispina'' Ludvigsen, 1979 * † ''Ceraurinella buttsi'' Cooper * † ''Ceraurinella chondra'' Whittington & Evitt, 1953 * † ''Ceraurinella kingstoni'' Chatterton & Ludvigsen, 1976 * † ''Ceraurinella latipyga'' Shaw, 1968 * † ''Ceraurinella longispina'' Ludvigsen, 1979 * † ''Ceraurinella media'' Ludvigsen, 1979 * † ''Ceraurinella nahanniensis'' Chatterton & Ludvigsen, 1976 * † ''Ceraurinella necra'' Ludvigsen, 1979 * † ''Ceraurinella oepiki'' Edgecombe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheiruridae
Cheiruridae is a family of phacopid trilobites of the suborder Cheirurina. Its members, as with other members of the suborder, had distinctive pygidia modified into finger-like spines. They first appeared in the uppermost Cambrian (upper Furongian), and persisted until the end of the Middle Devonian (Givetian). Currently about 657 species assigned to 99 genera are included. Distribution The subfamily Cheirurinae with 269 species in 38 genera occur from the Floian to the Givetian and are probably monophyletic. The 109 species in 15 genera of the Acanthoparyphinae are also probably monophyletic, and are known from the Floian to the Ludfordian. The Cyrtometopinae were present between the Floian and the Upper Katian, enveloping 22 species in 5 genera, of which the monophyly is unclear. The Deiphoninae are probably monophyletic, occur from the Dapingian to the Gorstian, having 71 species assigned to 6 genera. The possibly paraphyletic Eccoptochilinae with 67 species in 13 genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |