| Euomphalus Temporal range: | |
|---|---|
 | |
| Euomphalus pentangulatus | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Family: | † Euomphalidae |
| Genus: | † Euomphalus J. de C. Sowerby, 1814 |
Euomphalus is a genus of fossil marine gastropods known to have lived from the Silurian to the Middle Permian. [1] [2]
Euomphalus is characterized by a closely coiled shell with a depressed to slightly elevated spire and a channel-bearing angulation (a selenizone) on the upper surface of the whorls. The lower surface of the whorls is rounded to angular. [1]
Amphiscapha , Philoxene , and Straparollus are among similar related genera. Serpulospira , also related, differs in having a broadly open spiral in the adult form.
Euomphalus is the type genus of the family Euomphalidae. Euomphalus pentangulatus (Sowerby, 1814) is its type species.
Bulla is a genus of medium to large hermaphrodite sea snails, shelled marine opisthobranch gastropod molluscs. These herbivorous snails are in the suborder Cephalaspidea, headshield slugs, and the order Opisthobranchia.
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods.
Littorina is a genus of small sea snails, marine gastropod molluscs in the family Littorinidae, the winkles or periwinkles.
Pholadidae, known as piddocks or angelwings, are a family of bivalve molluscs similar to a clam.
Turritella is a genus of medium-sized sea snails with an operculum, marine gastropod mollusks in the family Turritellidae.
Trochus is a genus of medium-sized to large, top-shaped sea snails with an operculum and a pearly inside to their shells, marine gastropod molluscs in the subfamily Trochinae of the family Trochidae, the top snails.
Thais, sometimes known by the common names dog winkles or rock shells, is a genus of medium to large predatory sea snails with an operculum, marine gastropod mollusks in the family Muricidae.
Bullata is a genus of small to large sea snails, marine gastropod mollusks in the family Marginellidae, the margin snails.
Cerithium is a genus of small to medium-sized sea snails, marine gastropod molluscs in the family Cerithiidae, the ceriths.
Cassis, common name the helmet shells, is a genus of very large sea snails, marine gastropod mollusks in the family Cassidae, the helmet shells and their allies. This is the type genus of the subfamily Cassinae.
Tenguella granulata, common name the mulberry shell or the granulated drupe, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Pteropurpura is a genus of sea snails, marine gastropod mollusks in the subfamily Ocenebrinae of the family Muricidae, the murex snails or rock snails.
Stomatia, common name the keeled wide mouths, is a genus of sea snails, marine gastropod mollusks in the family Trochidae, the top snails.
Monoplex is a genus of predatory sea snails, marine gastropod mollusks in the family Cymatiidae.
Trigonostoma is a genus of sea snails, marine gastropod mollusks in the family Cancellariidae, the nutmeg snails.
Gradiconus is a synonym of a subgenus of sea snails, marine gastropod mollusks in the genus Conus, family Conidae, the cone snails and their allies. T
Stilifer is a genus of small ectoparasitic sea snails that used to belong in the family Stiliferidae. Most recent sources consider it part of the family Eulimidae, which also belongs to the superfamily Eulimoidea.
Mantelliceras is an extinct ammonoid cephalopod genus belonging to the family Acanthoceratidae and type for the subfamily Mantelliceratinae, that lived from the Late Albian to the late Cenomanian stage of the Late Cretaceous.
Goniofusus is a genus of sea snails, marine gastropod mollusks in the subfamily Fusininae of the family Fasciolariidae, the spindle snails, the tulip snails and their allies.
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