Typhlokorynetes
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''Typhlokorynetes plana'' is a species of small, button-shaped asaphid
trilobites 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 ...
of the family Raphiophoridae that lived during the Early
Tremadocian The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from to million years ago. The base of the Tremadocian is defined as the first appearance of the ...
of Vermont, United States.


Etymology

The generic epithet is a compound word of the Greek words "Typhlos," meaning "blind," and "Korynetes," which means "club-bearer," in reference to the animal's eyeless state, and the glabellum that is shaped in the outline of a club or bowling pin. The specific name "plana" refers to the flattened nature of the body.


History of taxonomy

The first fossils of this trilobite were described by P. E. Raymond in 1937 as a blind proetid that he named "''Warburgella" plana''.RAYMOND, P.E., 1937, Upper Cambrian and Lower Ordovician Trilobita and Ostracoda from Vermont: Geol. Soc. America, Bull., v. 48, p. 1079-1146, 4 pls In 1959, "''W." plana'' would be redescribed by H. B. Whittington as a species of ''Raymondaspis'' in the family Styginidae.WHITTINGTON, H. B., 1959a, Family Styginidae, in Treatise on invertebrate paleontology, pt. 0, Arthropoda 1: Lawrence, Kansas, Geol. Soc. America and Kansas Univ. Press, p. 365-367, Figs. 275-277 Alan Shaw voiced a similar opinion when he moved it into its own genus and family, ''Typhlokorynetes'' in Typhlokorynetidae, in that it maybe a specialized styginid with unusual or aberrant sutures and hypostome anatomy. During the 1970s, it was then reappraised as a relative of ''Endymion'' in Raphiophoridae.


Occurrence

Specimens are known from the Highgate Formation in northwestern Vermont.


References

{{Taxonbar, from=Q104834163 Asaphida Ordovician trilobites of North America Geology of Vermont