''Cryptolithus'' is a genus of extinct trinucleid

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 ...

s that lived during the

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start ...

period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (or rhetorical period), a concept ...

. They were mostly blind. They are found in the United States, Canada, Venezuela, the United Kingdom, France, the Czech Republic, Morocco and Turkey.

Species

Valid species of ''Cryptolithus'' include:Museum of Comparative Zoology
/ref> * '' Cryptolithus bellulus'' (

Ulrich Ulrich (), is a German given name, derived from Old High German ''Uodalrich'', ''Odalric''. It is composed of the elements '' uodal-'' meaning "(noble) heritage" and ''-rich'' meaning "rich, powerful". Attested from the 8th century as the name of Al ...

, 1879) * '' Cryptolithus carimatus'' * '' Cryptolithus fittsi'' (

& Whittington) * '' Cryptolithus goldfussi'' ( Barrande) * '' Cryptolithus inopinatus'' (Whittard) * ''

Cryptolithus intertetus ''Cryptolithus'' is a genus of extinct trinucleid trilobites that lived during the Ordovician period. They were mostly blind. They are found in the United States, Canada, Venezuela, the United Kingdom, France, the Czech Republic, Morocco and Tu ...

'' (Whittard) * '' Cryptolithus lorerainensis'' (Ruedemann) * '' Cryptolithus lorettensis'' (

Foerste Foerste is a surname. Notable people with the surname include: * August Foerste (1862–1936), American geologist, science teacher, and paleontologist * Maxime Foerste (born 1991), German actress See also * Renata Forste, American sociologi ...

, 1924) * '' Cryptolithus ornatus'' (Sternberg) * '' Cryptolithus portlockii'' ** '' Cryptolithus portlockii girvanensis'' * '' Cryptolithus quadrillatus'' * '' Cryptolithus recurvus'' (

, 1919) * '' Cryptolithus tessellatus'' (

Green Green is the color between cyan and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495570 Nanometre, nm. In subtractive color systems, used in painting and color printing, it is created by ...

, 1832) * ''

Cryptolithus ultimus ''Cryptolithus'' is a genus of extinct trinucleid trilobites that lived during the Ordovician period. They were mostly blind. They are found in the United States, Canada, Venezuela, the United Kingdom, France, the Czech Republic, Morocco and Tu ...

'' ( Barrande)

References

{{Taxonbar, from=Q3698832 Trinucleidae Asaphida genera