Sandbergeroceras Hyatt 1884

Genus Sandbergeroceras Hyatt, 1884 Type species Goniatites tuberculoso-costatus Sandberger & Sandberger, 1850, by original designation. Diagnosis Triainoceratidae with eight to twelve umbilical lobes. Included species Goniatites tuberculoso-costatus Sandberger & Sandberger, 1850, Rhenish Mountains; Sandbergeroceras acutum Termier & Termier, 1950, Anti-Atlas; Goniatites costatus d’Archiac & de Verneuil, 1842, Rhenish Mountains; Sandbergeroceras sandbergerorum Miller, 1938, Rhenish Mountains; Sandbergeroceras syngonum Clarke, 1899, New York; Goniatites incertus d’Archiac & de Verneuil, 1842, Rhenish Mountains; Goniatites tuberculosus d’Archiac & de Verneuil, 1842, Rhenish Mountains; Sandbergeroceras archiaci sp. nov., Rhenish Mountains. Remarks Hyatt (1883 –1884) established two genera for multilobate, coarsely ribbed ammonoids previously described from the Red Ironstone by d’Archiac & de Verneuil (1842) and Sandberger & Sandberger (1850 –1856): (1) “ Sandbergeoceras ”, which was probably misspelled by Hyatt (1883 –1884: 333); his intention was obviously the genus name Sandbergeroceras with “ Goniatites tuberculoso-costatus Sandberger & Sandberger, 1850 ” as type species. This species, however, was not without problems, as it was only conceived by Sandberger & Sandberger (1850 –1856) as a combination of the two species “ Goniatites tuberculosus ” and “ Goniatites costatus ” introduced by d’Archiac & de Verneuil (1842). Miller (1938) discussed these problems and created the new name Sandbergeroceras sandbergerorum to replace “ Goniatites tuberculoso-costatus ”, but later(Miller 1952)supported the use of the name Sandbergeroceras tuberculosocostatum. This name was subsequently confirmed by the International Commission of Zoological Nomenclature (1956). Hyatt (1883 –1884) characterised the genus Sandbergeroceras on the basis of the suture line illustrated by Sandberger & Sandberger (1850 –1856: pl. 4 fig. 1f), which shows an undivided external lobe. However, it should be noted that the external lobe of the illustrated small specimen (Sandberger & Sandberger 1850 –1856: pl. 4 fig. 1a–e) is already rather clearly divided. (2) Triainoceras, which was introduced by Hyatt (1883 –1884: 336) with “ Goniatites costatus d’Archiac & de Verneuil, 1842 ” as the type species. This genus should be separated from “ Sandbergeoceras ” only in the trident subdivision of the external lobe. Both genera are probably to be regarded as synonyms; it is to be considered which of the two can be considered more suitable for classifing the specimens from the Red Ironstone. Since better original material is available for “ Goniatites tuberculoso-costatus Sandberger & Sandberger, 1850 ”, the genus Sandbergeroceras, which is founded on this species is preferred here.Published as part of Korn, Dieter & Bockwinkel, Jürgen, 2021, The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea), pp. 1-79 in European Journal of Taxonomy 771 on pages 66-67, DOI: 10.5852/ejt.2021.771.1503, http://zenodo.org/record/553609