Cymatium (Monoplex) pileare Dall, 1909 Cymatium pileare (Dall 1909) Triton macrodon Valenciennes, 1832 Monoplex macrodon is a species of predatory sea snail, a marine gastropod mollusk in the family Cymatiidae.

[1] This species is present in Baja California, Mexico – Colombia, in Galápagos, Clipperton Island and Cocos Island.

[2] Shells of Monoplex macrodon can reach a size of 35–90 millimetres (1.4–3.5 in).

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