''Cryptolithus'' is a genus of extinct epifaunal, suspension-feeding, trinucleid

trilobite Trilobites (; meaning "three-lobed entities") are extinction, extinct marine arthropods that form the class (biology), class Trilobita. One of the earliest groups of arthropods to appear in the fossil record, trilobites were among the most succ ...

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, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ...

period Period may refer to: Common uses * Period (punctuation) * Era, a length or span of time *Menstruation, commonly referred to as a "period" Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (o ...

. 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 Germanic given name derived from Old High German ''Uodalrich'', ''Odalric''. It is composed of the elements ''Othala rune, uodal-'' meaning "heritage" and ''-rih'' meaning "king, ruler". Attested from the 8th century as the name of Al ...

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

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

Cryptolithus inopinatus ''Cryptolithus'' is a genus of extinct epifaunal, suspension-feeding, Trinucleidae, trinucleid trilobites that lived during the Ordovician Period (geology), period. They were mostly blind. They are found in the United States, Canada, Venezuela, ...

'' (Whittard) * '' Cryptolithus intertetus'' (Whittard) * '' Cryptolithus lorerainensis'' (Ruedemann) * '' Cryptolithus lorettensis'' ( Foerste, 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 nm. In subtractive color systems, used in painting and color printing, it is created by a com ...

, 1832) * '' Cryptolithus ultimus'' ( Barrande)

References

{{Taxonbar, from=Q3698832 Trinucleidae Asaphida genera