Pictorial Guide to the Trilobite Order Proetida

PICTORIAL GUIDE
TO THE ORDER PROETIDA
last revised 15 July 2007 by S. M. Gon III

Superfamily Aulacopleuroidea

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Compare the pictorial approach above with the descriptive narrative below:

Superfamily Aulacopleuroidea
Cephalon: semicircular or semielliptical, with border and (typically wide) preglabellar field present; glabella typically short; eyes variable, with or without defined eye ridges, genal spines present; hypostome natant (primitive condition); exoskeleton pitted, or with small tubercles.
Thorax: 11-22 segments, pleural ends usually rounded, may bear axial spine.
Pygidium: may be small, short, with even margin (Aulacopleuridae), or longer, and with spines (some Brachymetopidae).
Families: Aulacopleuridae, Brachymetopidae, Rorringtoniidae
Representative Genera: Aulacopleura, Brachymetopus, Cordania, Namuropyge, Otarion, Paraaulacopleura, Rorringtonia.

Here are representative Aulacopleuroidea

Aulacopleura	Otarion

PROETIDA includes three Superfamilies:
(click on the images to view the pictorial guides)

Proetoidea

Phillipsia

Aulacopleuroidea

Aulacopleura

Bathyuroidea

Bathyurus

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