hypostome

The American Dictionary and Cyclopedia · 1910 · p. 46

[Pref. hypo-, and Gr. stoma = a mouth.] Compar . Anat .: The labrum or upper lip of trilobites.

Bu kavram başka kaynaklarda da geçiyor

Chandler's Encyclopedia (1898)
An Illustrated Encyclopedic Medical Dictionary (1893)

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