orthis definition

  • noun:
    • A genus of protrematous brachiopods having a straight hinge, subquadrate valves with ribbed exterior, well-developed teeth and sockets, with no calcified brachidium. The genus is considerably subdivided, and is now limited to a comparatively few species which occur in the first Silurian rocks.

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  • Sentence for "orthis"
    • I trust you understand the nature…
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