Ptychaspididae is a
family
Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...
of
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, containing the following genera:
*''
Alborsella''
*''
Changia''
*''
Eoptychaspis''
*''
Eowuhuia''
*''
Euptychaspis''
*''
Idiomesus''
*''
Kathleenella''
*''
Keithia''
*''
Keithiella''
*''
Macronoda''
*''
Plectrella''
*''
Proricephalus''
*''
Ptychaspis''
*''
Saukioides''
*''
Sunwaptia''
*''
Wilcoxaspis''
References
Dikelokephaloidea
Trilobite families
{{asaphida-stub