Aspa (gastropod)

Aspa is a genus of sea snails, marine gastropod mollusks in the family Bursidae, the frog shells.^[1]

Aspa Temporal range: Miocene - Recent PreꞒ Ꞓ O S D C P T J K Pg N
Fossil shell of Aspa marginata
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Bursidae
Genus:	Aspa H. Adams & A. Adams, 1853
Type species
† Ranella laevigata Lamarck, 1822
Synonyms
Bursa (Aspa) H. Adams & A. Adams, 1853 (original rank)

Description

The ovate shell is ventricose and smooth. The spire is very short. The whorls are nodulous at the angles. ^[2]

Species

Species within the genus Aspa include:

• Aspa marginata (Gmelin, 1791)^[3]

The genus Aspa is known in the fossil record from the Miocene epoch, about 13.65 million years ago. These fossils have been found in the Quaternary of Namibia and Spain, in the Pliocene of Costa Rica, Greece and Spain and in the Miocene of Austria, Greece, Hungary and Italy.^[4]