Revised 1 Nov. 2022
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Geotria Gray 1851 etymology not explained nor evident; see essay at PDF link above

Geotria australis Gray 1851 Latin for southern, referring to South Australia, type locality

Geotria macrostoma (Burmeister 1868) macro-, from makrós (Gr. μακρός), large; stóma (Gr. στόμα), mouth, presumably referring to greatly expanded oral disc of spawning adults