// Workers AI · dad joke modeWhat did Penion subregularis say? Shell I regularize?

Penion subregularis
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Austrosiphonidae
Genus:	Penion
Species:	†P. subregularis
Binomial name
†Penion subregularis (A. d'Orbigny, 1852)
Synonyms
† Fusus darwinianus R. A. Philippi, 1887 junior objective synonym (unnecessary replacement name) † Fusus regularis G. B. Sowerby I, 1846 junior homonym (junior primary homonym of F....) † Fusus subregularis (A. d'Orbigny, 1852) (superseded combination)

Penion subregularis is an extinct species of marine snail or whelk, belonging to the true whelk family Austrosiphonidae.

Distribution

Fossils of Penion subregularis were found in Navidad, Chile

External links

• Sowerby, G.B. I (1846). Appendix to part II. Descriptions of Tertiary fossil shells from South America. In: Darwin, C. Geological Observations on South America. Being the third part of the geology of the voyage of the Beagle under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836. London: Smith, Elder & Co. p. 259. Retrieved 26 April 2026. This article incorporates text from this source, which is in the public domain.