Euomphalus Explained

Euomphalus is a genus of fossil marine gastropods known to have lived from the Silurian to the Middle Permian.^{[1] [2]}

Description

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.

Taxonomy

Euomphalus is the type genus of the family Euomphalidae. Euomphalus pentangulatus (Sowerby, 1814) is its type species.

Species

• Euomphalus pentangulatus Sowerby, 1814(type)
• Euomphalus radiatus Menke, 1850: synonym of Heliacus (Heliacus) areola bicanaliculatus (Valenciennes, 1832) represented as Heliacus areola bicanaliculatus (Valenciennes, 1832)

Notes and References

1. J.B.Knight,et al 1960. Treatise on Invertebrate Paleontology, Part I, Mollusca 1, ch on systematic descriptions. Geol Soc of America and Univ Kansas Press.
2. (in Czech) Pek I., Vašíček Z., Roček Z., Hajn. V. & Mikuláš R.: Základy zoopaleontologie. - Olomouc, 1996. 264 pp., .