''Acastoides'' is an extinct genus of

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 ...

that lived during the

Silurian The Silurian ( ) is a geologic period and system spanning 23.5 million years from the end of the Ordovician Period, at million years ago ( Mya), to the beginning of the Devonian Period, Mya. The Silurian is the third and shortest period of t ...

and

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

. It has been found in Bolivia, France, Morocco, Poland, Turkey and the United Kingdom.

Distribution

* ''A. constricta'' is found in the Silurian of the United Kingdom (Wenlock, Woolhope Shale, Worcestershire, Malvern).

Taxonomy

Species previously assigned to ''Acastoides''

* ''A. verneuili'' = ''Calmonia terrarocenai''

References

External links

Photos of ''Acastoides sp.''

''Acastoides''
at the

Paleobiology Database The Paleobiology Database (PBDB) is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database originated in the NCEAS-funded Phanerozoic Marine Pale ...

Acastidae Devonian trilobites of Europe Wenlock first appearances Eifelian extinctions Silurian trilobites of Europe Phacopida genera {{Phacopida-stub