Compare the pictorial approach above with the descriptive narrative below:
Cephalon: convex, with distinct border of varying width, opisthoparian sutures; glabella well defined, subparallel or gently expanding/tapering forward, with 3 or fewer lateral furrows, sometimes faint or absent; eyes medium to large, placed opposite or behind center of glabella; hypostoma typically natant, but secondarily conterminent in advanced Bathyuridae; genal spines typically present, sometimes broad.
Thorax: 8-12 segments, pleurae typically with distinct furrows.
Pygidium: subisopygous to micropygous, gently to moderately convex, no border furrow, axis of varying length (absent in Celmidae), sometimes prolonged into post-axial ridge or axial spine, often 3 axial rings + terminal; exoskeleton sometimes ornamented variously with pits, tubercles, small spines, or terraces.
Families: Bathyuridae, Celmidae, Dimeropygidae, Glaphuridae, Holotrachelidae, Lecanopygidae, Telephinidae, Toernquistiidae.
Representative Genera: Bathyurus, Carolinites, Celmus, Dimeropyge, Glaphurus, Goniotelus, Holotrachelus, Lecanopyge, Platyantyx, Telephinus, Toernquistia.
Here are some representative Bathyuroidea
PROETIDA includes three Superfamilies:
(click on the images to view the pictorial guides)
Return to Proetida Fact Sheet