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| cephalon |
front part (head) of the trilobite |
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| isopygous |
pygidium and cephalon of essentially equal size |
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| macropygous |
pygidium larger than cephalon |
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| micropygous |
pygidium is much smaller than cephalon |
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| pygidium |
rearmost body section (tagma) comprising fused segments,
including tail that is separated from thoracic segments by
an articulation |
| schizochroal |
a type of trilobite eye with compound lenses, each with
separate cornea, and each lens separated from others by deep
scleral walls. A corneal membrane extends downward into sclera.
(contrast with see abathochroal and holochroal trilobite eye
types). |
| spinose |
having an exoskeleton with one to many spines |
| subisopygous |
pygidium somewhat smaller (subequal) to cephalon |
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| suture |
A linear break in the trilobite's exoskeleton along which
it separated during molting |
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References:
Fortey RA 1990. Ontogeny, hypostome attachment and trilobite classification.
Palaeontology 33:529-576.
Fortey RA. 2000. Trilobite! Eyewitness to Evolution. HarperCollins,
London.
Fortey RA A. 2001. Trilobite systematics: The last 75 years. Journal
of Paleontology 75:1141–1151.
Kaesler RL, ed. 1997. Treatise on Invertebrate Paleontology, Part
O, Volume 1, revised, Trilobita. Geological Society of America
and University of Kansas Press, Lawrence, Kansas.
Levi-Setti R 1993. Trilobites. University of Chicago Press, Chicago.
A Guide to
the Orders of Trilobites
- website by Dr. Sam Gon III
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