Tornoceras typus (Sandberger & Sandberger, 1851)
publication ID |
https://doi.org/ 10.5852/ejt.2022.806.1699 |
publication LSID |
lsid:zoobank.org:pub:A2B2A310-8C8C-41B0-B934-1666129B7D90 |
persistent identifier |
https://treatment.plazi.org/id/03DD7E29-FFAE-207E-FE03-F8FD1912FBE9 |
treatment provided by |
Felipe |
scientific name |
Tornoceras typus (Sandberger & Sandberger, 1851) |
status |
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Tornoceras typus (Sandberger & Sandberger, 1851) View in CoL
Fig. 4 View Fig ; Table 1 View Table 1
Goniatites retrorsus var. typus Sandberger & Sandberger, 1851: 109 , pl. 10 fig. 14.
Tornoceras simplex Mut. typus View in CoL – Holzapfel 1895: 98, text-fig. 6, pl. 6 fig. 11, pl. 7 fig. 9. Tornoceras typus View in CoL – Korn 2021b: 149, text-figs 2–5, 6a.
Tornoceras typum View in CoL – Becker 1993: 182, pl. 3 figs 1–2. — Korn & Klug 2002: 156, text-fig. 139.
? Goniatites retrorsus var. typus – Sandberger & Sandberger 1851: pl. 10a figs 3–6, 10–11.
? Tornoceras simplex View in CoL – Foord & Crick 1897: 69, 107, text-figs 25d–f, 48.
? Tornoceras simplex mut. View in CoL ovata – Frech 1902b: 47, pl. 3 fig. 21.
non Tornoceras typum View in CoL – Becker 1993: 182, pl. 3 figs 3–4, text-fig. 68a. — Becker et al. 2000: pl. 2 figs 7–8. — Korn & Klug 2002: 156, text-fig. 143a–c.
non Tornoceras simplex View in CoL – Frech 1902: 47, pl. 5 fig. 8. — Wedekind 1918: 135, pl. 16 fig. 12, textfig. 40a.
Diagnosis
Tornoceras reaching about 90 mm conch diameter. Thickly pachyconic, subevolute early juvenile stage (ww/dm ~ 0.80; uw/dm ~ 0.35 at 2 mm dm), thickly discoidal and involute subadult stage (ww/ dm ~ 0.58; uw/dm ~ 0.08 at 10 mm dm), thinly discoidal and involute adult stage (ww/dm ~ 0.42; umbilicus closed at 30 mm dm). Whorl profile as wide as high in the subadult stage (ww/wh ~ 1.00 at 10 mm dm) and strongly compressed in the adult stage (ww/wh ~ 0.75 at 30 mm dm); whorl expansion rate very high in the subadult and adult stage (WER = 2.30-2.45). Flanks convex, convergent, umbilical margin continuously rounded. Without any ventrolateral grooves. Suture line with broadly rounded, asymmetric adventive lobe and high ventrolateral saddle.
Type material
Lectotype GERMANY • Rhenish Mountains, Oberscheld ; probably middle Frasnian (Adorf Limestone); designated by Becker (1993); figured by Sandberger & Sandberger (1850 –1856: pl. 10 fig. 14), Becker (1993: pl. 3 figs 1–3) and Korn (2021b: text-fig. 2), re-illustrated here in Fig. 4 View Fig ; specimen 53a; Wiesbaden Museum .
Additional material examined
GERMANY • 1 spec.; Rhenish Mountains , Oberscheld; middle Frasnian (Adorf Limestone); Erbreich Coll.; MB.C.4466 • 1 spec.; Rhenish Mountains , Oberscheld; middle Frasnian (Adorf Limestone); Koch Coll.; MB.C.30409 • 1 spec.; Rhenish Mountains , Dillenburg , Eiserne Hand (Grube Friedrich); middle Frasnian (Adorf Limestone); MB.C.30410 .
Description
Lectotype 53a (Wiesbaden Museum)
Fairly well-preserved specimen with 46 mm conch diameter in red limestone; it is largely chambered and the last half volution belongs to the body chamber ( Fig. 4 View Fig ). It is a thinly discoidal conch (ww/ dm = 0.40) with a closed umbilicus. The body chamber is obviously slightly distorted, resulting in a stronger convergence of the flanks (as shown in the original illustration by Sandberger & Sandberger 1850 –1856). Parts of the specimen are covered by shell material, which, however, is not well preserved and does not allow a detailed examination of the ornamentation. The suture line has a small, V-shaped outer lobe and a broadly rounded ventrolateral saddle. The adventitious lobe is twice as deep as the outer lobe and as deep as it is wide; it is broadly rounded and slightly asymmetric.
Remarks
The species has been discussed several times in the literature. A detailed revision and discussion was carried out by Korn (2021b); in this paper both the taxonomic problems and the conch morphology as well as the ontogenetic development are presented on the basis of further material from the Rhenish Mountains.
Specimen | dm | ww | wh | uw | ah | ww/dm | ww/wh | uw/dm | WER | IZR |
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Wiesbaden 53a | 46.0 | 18.3 | 29.7 | 0.0 | 15.2 | 0.40 | 0.62 | 0.00 | 2.23 | 0.49 |
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Kingdom |
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Genus |
Tornoceras typus (Sandberger & Sandberger, 1851)
Korn, Dieter & Bockwinkel, Jürgen 2022 |
Tornoceras typum
Korn D. & Klug C. 2002: 156 |
Becker R. T. 1993: 182 |
Tornoceras typum
Korn D. & Klug C. 2002: 156 |
Becker R. T. 1993: 182 |
Tornoceras simplex
Wedekind R. 1918: 135 |
Tornoceras simplex mut.
Frech F. 1902: 47 |
Tornoceras simplex
Foord A. H. & Crick G. C. 1897: 69 |
Tornoceras simplex
Korn D. 2021: 149 |
Holzapfel E. 1895: 98 |
Goniatites retrorsus var. typus
Sandberger & Sandberger 1851: 109 |
Goniatites retrorsus var. typus
Sandberger & Sandberger 1851: 37 |