TO THE ORDER PHACOPIDA
last revised 01 January 2008 by S. M. Gon III
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Suborder Cheirurina
Compare the above pictorial approach to the purely narrative description
Compare the above pictorial approach to the purely narrative description
| Suborder Cheirurina
Cephalon: proparian sutures (a few opisthoparian), glabella usually expanding forwards or barrel-shaped, up to 4 pairs of furrows; holochroal eyes, often small; gena often with fine pitting; with rostral plate; hypostome conterminant, with anterior wing bearing prominent process. Thorax: variable numbers of distinctive segments within Phacopida range of 8-19, often spine-tipped. Pygidium: often highly modified with 2-16 distinct pairs of ribs, and lobed or spinose margin. Other: often with tuberculate exoskeleton. Superfamilies/Families: Cheiruroidea/Cheiruridae, Encrinuridae, Hammatocnemidae, Pilekiidae, Pliomeridae, Staurocephalidae Representative Genera: Ceraurus, Cheirurus, Coronocephalina, Crotalocephalina, Cybeloides, Cyrtometopus, Encrinuroides, Encrinurus, Heliomera, Ktenoura, Lyrapyge, Pilekia, Placoparia, Pliomera, Pseudocybele, Sphaerocoryphe, Sphaerexochus, Staurocephalus |
Here are some members of the Cheirurina
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| Ceraurus | Encrinurus | Cybeloides |
PHACOPIDA includes three Suborders
| Phacopina
Reedops
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Calymenina
Calymene
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Cheirurina
Cheirurus
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Walking Trilobite animation ©2000
by S. M. Gon III
All line drawings this page ©1999 - 2008 by
S.
M. Gon III
