Category
page 1Paleozoic crustaceans

Phyllocarida
Phyllocarida is a subclass of crustaceans, comprising the extant order Leptostraca and the extinct orders Hymenostraca and Archaeostraca. This clade of marine crustaceans diversified extensively during the Ordovician.
left|thumb|Undescribed fossil of a very large phyllocarid from the Yukon ([[Devonian)]]
Hymenocaris
Hymenocaris is a genus of Cambrian marine arthropod. The type species, Hymenocaris vermicaudata is known from the Upper Cambrian (Furongian) Ffestiniog Formation, in North Wales, United Kingdom.