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LIBROSTOMA

Librostoma

Extinct subclass of trilobites

Librostoma is a subclass of trilobites defined by having a natant hypostome, which is a hypostome (mineralized trilobite mouthpart) that is free from the

Librostoma

Ptychopariida

Extinct order of trilobites

some species the pygidium is outlined with a flat border. The Subclass Librostoma was recently erected to encompass several related orders, including Ptychopariida

Ptychopariida

Harpetida

Extinct order of trilobites

Ptychopariida, but were recently given their own order in 2002. The subclass Librostoma was erected in 1990 by Richard Fortey to cover the various orders originally

Harpetida

Trilobite

Class of extinct, Paleozoic arthropods

and Harpetida were grouped together as order Ptychopariida; subclass Librostoma was erected in 1990 to encompass all of these orders, based on their shared

Trilobite

Proetida

Extinct order of trilobites

Ptychopariida in some features, the proetids are included in the subclass Librostoma. Unlike the trilobites of the phacopid suborder Phacopina, whose eyes

Proetida

Phacopida

Extinct order of trilobites

with the order Ptychopariida, though it is not included in the subclass Librostoma. Phacopida was one of only two trilobite orders (along with the Proetida)

Phacopida

Asaphida

Extinct order of trilobites

Animalia Phylum: Arthropoda Clade: †Artiopoda Class: †Trilobita Subclass: †Librostoma Order: †Asaphida Fortey & Chatterton, 1988 Superfamilies Anomocaroidea

Asaphida