Rineceras Hyatt, 1893

Genus Rineceras Hyatt, 1893

Type species

Gyroceras propinquum de Koninck, 1880 ; subsequent designation by Foord (1900).

Diagnosis

Genus of the family Trigonoceratidae with evolute conch; whorls detached or slightly in contact; whorl profile elliptical or rounded triangular with broad venter. Ornament with coarse growth lines and coarse spiral ridges; coarse granulation at the crossing points of growth lines and spiral ridges. Suture line with shallow external and lateral lobes. Siphuncle small with subcentral position (after Kummel 1964; emended).

Included Early Carboniferous species

Rhineceras alapaevskensis Kruglov, 1934, Urals; Pararineceras balladoolense Turner, 1954, Isle of Man; Nautilus canaliculatus von Eichwald, 1857 , south Urals; Rineceras carinatiforme Shimansky, 1967 , Kazakhstan; Nautilus carinatus von Eichwald, 1857 , western Russia; Nautilus ( Discus) digonus Meek & Worthen, 1860 , Indiana; Nautilus Luidii Fleming, 1828 View in CoL , Derbyshire; Nautilus ( Trematodiscus) Meekianus Winchell, 1862 , Michigan; Gyroceras Meyerianum de Koninck, 1844, Belgium; Rineceras multituberculatum sp. nov., Algeria; Rineceras ohioense Miller & Garner, 1953 , Ohio; Triboloceras patteiskyi Schmidt, 1951, Rhenish Mountains; Gyroceras propinquum de Koninck, 1880 , Belgium; Rineceras rectangulatum sp. nov., Algeria; Nautilus rhenanus Holzapfel, 1889 , Rhenish Mountains; Nautilus ( Trematodiscus) strigatus Winchell, 1862 , Michigan.

Remarks

Turner (1954) introduced the genus Pararineceras on the basis of the species originally described by Martin (1793, 1809) as “Conchyliolithus N. Ammonites ( Luidii)”, but as Martin did not follow the Linnaean binomial procedure, Fleming (1828) is regarded as the author of the species ( Turner 1953). This species differs from most of the species assigned to the genus Rineceras only by the more densely coiled conch, a character that might be gradual and not useful for a separation of genera. While Kummel (1964) accepted both of the two genera, Shimansky (1967) and Dzik (1984) regarded Pararineceras as a synonym of Rineceras . In the following, we treat Pararineceras a junior synonym of Rineceras until a clear separation can be demonstrated.

Stratigraphic range

Middle Tournaisian to Serpukhovian.