| Addisonia | |
|---|---|
 | |
| Drawing of three views of Addisonia excentrica | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Lepetellida |
| Superfamily: | Lepetelloidea |
| Family: | Addisoniidae |
| Subfamily: | Addisoniinae |
| Genus: | Addisonia Dall, 1882 [1] |
Addisonia is a genus of sea snails, marine gastropod mollusks in the family Addisoniidae. [2]
The ovate shell has a subconical shape. It is strongly symmetrical, porcellaneous, and thin. The blunt apex is curved backward, downward, and to the left. The shell has no epidermis. The margin is unthickened, simple, and entire. The pedal muscular impression is horseshoe-shaped and interrupted in front.
The radula has a large simple rhachidian tooth with, on each side, two large, simple transverse laterals, followed by two minute ones, and a large outer lateral with a strong tridentate cusp, outside of which is a single scale-like flat uncinus, bearing an elongated thickened ridge, but no cusp.
Soft parts : the head is provided with two tentacles without eyes or eye tubercles. The muzzle is plain and simple. The foot is thin, orbicular, without lateral or posterior tubercles, processes or fringes. The mantle edge is simple and thickened. The gill is composed of leaflets as in Patella , the series starting on the right behind the head and continued within the mantle edge backward. The body of the animal is asymmetrically placed with regard to the aperture of the shell to afford room for the enormous series of branchial leaflets. The anus opening is behind and above the head slightly to the right of the median line, and indicated by a small papilla. [3]
Species within the genus Addisonia include:
Latiaxis is a genus of medium-sized sea snails, marine gastropod mollusks in the family Muricidae, subfamily Coralliophilinae, the coral snails or coral shells.
Lepetelloidea is a superfamily of sea snails, small deepwater limpets, marine gastropod mollusks in the clade Vetigastropoda.
Addisonia brophyi is a species of sea snail, a marine gastropod mollusk in the family Addisoniidae.
Addisonia excentrica is a species of sea snail, a marine gastropod mollusk in the family Addisoniidae.
Pseudococculina is a genus of sea snails, marine gastropod mollusks in the family Pseudococculinidae.
Bellaspira is a genus of sea snails, marine gastropod mollusks in the family Drilliidae.
Compsodrillia is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae, the turrids and allies.
Daphnella is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Pleurotomella is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Clionella is a genus of sea snails, marine gastropod mollusks in the family Clavatulidae.
Ancistrobasis is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.
Tricolia is a genus of sea snails, marine gastropod mollusks in the subfamily Tricoliinae of the family Phasianellidae.
Amblychilepas is a genus of sea snails, marine gastropod mollusks in the family Fissurellidae, the keyhole limpets.
Gaza is a genus of sea snails, marine gastropod mollusks in the family Margaritidae.
Stomatia, common name the keeled wide mouths, is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.
Abyssochrysos is a genus of bathyal sea snails, marine gastropod mollusks in the family Abyssochrysidae.
Fossarus is a genus of sea snails, marine gastropod mollusks in the family Planaxidae.
Medusafissurella is a genus of minute deepwater keyhole limpets, marine gastropod mollusks or micromollusks in the family Fissurellidae, the keyhole limpets and slit limpets.
Muricopsinae is a taxonomic subfamily of predatory sea snails, marine gastropod mollusks within the large family Muricidae, the murex snails and rock snails.
Calliostomatinae is a subfamily of gastropods, belonging to the family Calliostomatidae.