Tornoceras Hyatt 1884
Creators: name: Korn, Dieter
name: Bockwinkel, Jürgen
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Ammonoidea
Tornoceratidae
Tornoceras

description: Genus Tornoceras Hyatt, 1884
Type species
Goniatites uniangularis Conrad, 1842; by original designation.
Diagnosis
Genus of the subfamily Tornoceratinae with compressed conch, umbilicus closed in the pre-adult stage but slightly opened in the juvenile stage. Usually without ventrolateral grooves. Growth lines biconvex, without ribs. Sutural formula E A L I; adventive lobe broadly rounded, asymmetric with steep dorsal flank.
Included species
Tornoceras aequilobum Söte, Becker, Herd & Bockwinkel, 2021, Rhenish Mountains; Tornoceras (Tornoceras) uniangulare var. aldanense House, 1965, New York; Tornoceras (Tornoceras) amuletum House, 1965, New York; Tornoceras simplex Mut. angustelobata Holzapfel, 1895, Rhenish Mountains; Tornoceras (Tornoceras) arcuatum House, 1965, Michigan; Tornoceras (Tornoceras) arkonense House, 1965, Ontario; Goniatites Astarte Clarke, 1885, New York; Tornoceras baldisi Leanza, 1968, Argentina; Tornoceras Bertrandi Frech, 1902, Montagne Noire; Tornoceras (Tornoceras) bolivianum Kullmann, 1980, Bolivia; Tornoceras uniangulare var. compressum Clarke, 1899: 116; New York; Tornoceras (Tornoceras) concentricum House, 1965, New York; Tornoceras (Tornoceras) contractum Glenister, 1958, Western Australia; Tornoceras Edwin -Halli Clarke, 1899, New York; Tornoceras Frechi Wedekind, 1918, Rhenish Mountains; Tornoceras fundibulum Korn, 2021, Rhenish Mountains; Linguatornoceras holwilli House, 2002, Devon; Goniatites Hughesii Whidborne, 1890, Devon; Tornoceras (Tornoceras) iowaense Miller, 1938, Iowa; Gomi -monomeroceras (Tornoceras) kielcense Sobolev, 1914, Holy Cross Mountains; Tornoceras Lewinskii Dybczynski, 1913, Holy Cross Mountains; Tornoceras uniangulare var. obesum Clarke, 1899, New York; Tornoceras occasus Korn, 2021, Anti-Atlas; Tornoceras ortus Korn, 2021, Anti-Atlas; Tornoceras postsimplicius Pajchlowa, 1972; Tornoceras radialis Becker, 1993, Rhenish Mountains; Tornoceras subacutum Makowski, 1991, Holy Cross Mountains; Gomi - monomeroceras (Tornoceras) sublentiforme Sobolev, 1914, Holy Cross Mountains; Goniatites retrorsus var. typus Sandberger & Sandberger, 1851, Rhenish Mountains; Goniatites uniangularis Conrad, 1842, New York; Tornoceras varicatum Grüneberg, 1925, Rhenish Mountains; Tornoceras Verae Frech, 1902, Montagne Noire; Tornoceras vretterense Korn, 2021, Rhenish Mountains; Tornoceras Whidbornei Foord & Crick, 1897, Devon; Tornoceras (Tornoceras) uniangulare var. widderi House 1965, Ontario; Tornoceras wunderlichi Bockwinkel & Korn, 2015, Rhenish Mountains;
Remarks
Tornoceras is a genus that has long been used as a taxon to group together most involute Late Devonian ammonoids with a simple suture line. Even after the revisions by House (1965) and Becker (1993) and their separation of a number of new genera, there is a long list of species assigned to the genus (Korn & Klug 2002). Most of these species are morphologically very similar and a detailed description of the ontogenetic development of the conch is lacking. A revision of the genus would require a careful description of the ontogeny, suture lineage and growth lineage of the material from the different geographical regions and stratigraphic units (Korn 2021a).
description: Published as part of Korn, Dieter & Bockwinkel, Jürgen, 2022, The tornoceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea), pp. 32-51 in European Journal of Taxonomy 806 on page 36, DOI: 10.5852/ejt.2022.806.1699, http://zenodo.org/record/6373961