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TaxonomyThere are 3 distinct colour forms of the large land snail Acavus superbus:
- white with a golden-brown outer margin in superbus
- uniformly black in grevillei
- dark rose pink in roseolabiatus
Distinguishing Acavus superbus from closely related species
Acavus superbus can be readily distinguished from the 2 other species in the genus:
- The shell of A. haemastoma is boldly banded brown and white.
- A. phoenix is a larger species with a paler and more rounded shell and a glossy black body.
Acavus and Oligospira belong to a very ancient group of land snails, the Acavoid-Strophocheild clade, that has a history dating back to the break-up of the supercontinent of Gondwana more than 200 million years ago. The modern-day representatives of this ancient clade have a distribution extending from South America to:
- Southern Africa
- the Seychelles
- Sri Lanka
- eastern Australia