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Aglaspidida
The Aglaspida, more correctly termed Aglaspidida, were a group of small, horseshoe crab-like arthropods that were once regarded as basal or ancestral horseshoe crabs. However, they cannot be accommodated within the chelicerates. Now, though, they are regarded as a distinct group, possibly being close to the trilobites. The older idea that they link trilobites with Chelicerata has fallen out of favour.
Aglaspid fossils are found throughout the world, including North America (upper Mississippi valley, Missouri and Utah), Europe, and Australia.
As of 1997, Hou & Bergström split off Strabopidae (which were once regarded as being primitive eurypterids), including the genera ''Strabops'', ''Paleomerus'', ''Parapaleomerus'', and ''Neostrabops'', as its own distinct order/taxon, "Strabopida."
==List of Genera==
*''Aglaspella''
*''Aglaspis''
*''Aglaspoides''
*''Angarocaris''
*''Australaglaspis''
*''Beckwithia''
*''Borchgrevingkium''
*''Craspedops''
*''Cyclopites''
*''Flobertia''
*''Girardevia''
*''Glypharthrus''
*''Kodymirus''
*''Neostrabops''
*''Setaspis''
*?''Sinaglaspis''
*''Strabops''
*''Triopus''
*''Tuboculops''
*''Uarthrus''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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