†Spironema is a genus of extinct (Cretaceous) sea snails, marine gastropod mollusks in the family Naticidae, the moon snails.[1]
Spironema Temporal range:
| |
---|---|
Scientific classification | |
Kingdom: | |
Phylum: | |
Class: | |
(unranked): | |
Superfamily: | |
Family: | |
Genus: | †Spironema |
The American paleontologist Fielding Bradford Meek firstly defined this genus in 1864.[2] He classified the genus in the family Littorinidae.[2] He recognized two species Spironema bella and Spironema tenuilineata in 1864.[2] These species were previously classified within the family Trochidae.[2] Meek's diagnosis reads as follows:[2]
Shell ovate; whorls rounded, and separated by a rather deep
suture; aperture ovate, lip thin, continuous; columella not thickened, perforated by a very small umbilicus; surface with revolving lines and furrows. The non-perlaceous texture of the interior layer, as well as the other characters of such Cretaceous
shells, remove them from the Trochidae.
Species within the genus Spironema include:
This article incorporates public domain text from the reference[2]