Microtis (gastropod)

Lore & Background

The spiral shell of Microtis is suborbicular and depressed, bearing two tuberculated ridges. The spire is slightly projecting, and the aperture is very large, wider than long, with a pearly interior. The columellar margin is spiral and visible as far as the apex of the spire. Notably, there is no operculum.

Species within the genus include Microtis tuberculata, described by A. Adams in 1850. Two other species have been brought into synonymy: Microtis heckeliana is considered a synonym of Microtis tuberculata, and Microtis rubra is a synonym of Stomatolina rubra.

This marine genus occurs off Northern Australia and in the South Pacific Ocean.

Reader's Guide

The genus Microtis is significant within the family Trochidae for its distinctive shell morphology, particularly the very large aperture that is wider than long and the absence of an operculum. The shell's pearly interior and two tuberculated ridges are characteristic features. The genus has been documented in the scientific literature since at least 1850, when A. Adams described the species Microtis tuberculata in the Proceedings of the Zoological Society of London. Subsequent taxonomic work has synonymized two other species under Microtis tuberculata and Stomatolina rubra, reflecting ongoing refinement of the genus's classification. The distribution of Microtis in Northern Australia and the South Pacific Ocean places it in tropical marine environments. The genus is referenced in works such as those by Allan (1935) and Wilson (1993) on Australian shells, indicating its place in regional malacological studies.

Did You Know?

• The shell of Microtis has no operculum.
• The aperture is very large and wider than long.
• Microtis heckeliana is a synonym of Microtis tuberculata.