Introduction The genus Retusa is a fascinating group of very small marine gastropod molluscs, commonly known as head-shield sea snails or barrel-bubble snails. These intriguing creatures belong to the family Retusidae and are characterized by their unique shell shapes and sizes. Found in various marine environments, members of the Retusa genus are notable for their…
Introduction Helenodiscus was a genus of small, air-breathing land snails that belonged to the family Charopidae. These terrestrial pulmonate gastropod mollusks were noted for their unique adaptations to their environments and played distinct roles in their ecosystems. Unfortunately, both species within this genus have been declared extinct by the International Union for Conservation of Nature…