Megastomia simplex, common name the simple pyramid shell, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.of Tasmania : Syrnol A guide to the seashell and other marine mollusks a simplexMolluscaBase eds. (2022). MolluscaBase. Megastomia simplex (Angas, 1871). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=722616 on 2022-07-17
Description The white, rather solid shell has a smooth appearance. The length of the shell measures . The teleoconch contains 7½ rather flat whorls . They are a little angulated at the suture. The aperture is lirate within. Its plait is sharp and transverse.G.W. Tryon, Manual of Conchology vol. VIII p. 363; 1889
Distribution The type specimen of this marine species was found off Port Jackson, New South Wales, Australia.
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