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Chapter 8 Leary

Rhachitomous

Large intercentrum and small pleurocentrum paired up.

Embolomerous

Equal contributions of intercentrum and pleurocentrum,

Stereospondylous

Centrum is composed of a single unit derived from the intercentrum.

Aspidospondylous condition

Rhachitomous, embolomerous, and/or stereospondylous

Lepospondylous

Centrum is composed almost entirely of the Pleurocentrum and is spool-shaped with a central canal perforated by the notochord.

Holospondylous

Lepospondylous

Acoelous

flat centra

Amphicoelous

concave centra

Procoelous

concave anterior, convex posterior

Opisthocoelous

convex anterior and concave posterior

Heterocoelous

both ends saddle shaped

Acoelous and Amphicoelous

withstand compression but restrict movement

Procoelous, Opisthocoelous, and Heterocoelous

greater range of motion. (Hetero- has the most)

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