Cerithium biquadratum, Hilber, 1879

Harzhauser, Mathias, Guzhov, Aleksandr & Landau, Bernard, 2023, A revision and nomenclator of the Cainozoic mudwhelks (Mollusca: Caenogastropoda: Batillariidae, Potamididae) of the Paratethys Sea (Europe, Asia), Zootaxa 5272 (1), pp. 1-241 : 169

publication ID	https://doi.org/ 10.11646/zootaxa.5272.1.1
publication LSID	lsid:zoobank.org:pub:1E54F7B0-76B1-4E66-8EB0-32685D378D08
persistent identifier	https://treatment.plazi.org/id/03A73336-918B-F6F2-FF5D-FB654D26F9B3
treatment provided by	Plazi
scientific name	Cerithium biquadratum
status

Treatment

biquadratum . Cerithium . Hilber, 1879a see Theodisca theodisca ( Rolle, 1856)

* Cerithium biquadratum Hilb. — Hilber 1879a: 441, pl. 4, figs 6a–c.

Type material. Holotype, UMJG & P 200.147 , SL: 12.2 mm, MD: 5.1 mm, Universalmuseum Joanneum (Graz, Austria), illustrated in Hilber (1879a: pl. 4, figs 6a–c).

Type locality. Gamlitz ( Austria) .

Stratigraphy. Middle Miocene, Badenian.

Discussion. Cerithium biquadratum is known by a single specimen from Gamlitz, where it co-occurs with numerous shells of T. theodisca . We consider it to be an extreme morph of Theodisca theodisca ( Rolle, 1856) .

Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Styrian Basin: Gamlitz, St. Florian ( Hilber 1879a); Pannonian Basin: Herend–Márkó, Hidas, Várpalota ( Hungary) ( Kókay 1966; Strausz 1966).