Kornia sphaeroidalis ( Vöhringer, 1960 ) Korn & Weyer, 2023

Korn, Dieter & Weyer, Dieter, 2023, The ammonoids from the Gattendorfia Limestone of Oberrödinghausen (Early Carboniferous; Rhenish Mountains, Germany), European Journal of Taxonomy 882, pp. 1-230 : 38-39

publication ID

https://doi.org/ 10.5852/ejt.2023.882.2177

publication LSID

lsid:zoobank.org:pub:67C909E4-C700-4F8D-B8CE-5FD9B2C5D549

DOI

https://doi.org/10.5281/zenodo.8184738

persistent identifier

https://treatment.plazi.org/id/03EA5C14-CA2C-8569-FE27-FDDFFCB680AE

treatment provided by

Felipe

scientific name

Kornia sphaeroidalis ( Vöhringer, 1960 )
status

comb. nov.

Kornia sphaeroidalis ( Vöhringer, 1960) comb. nov.

Fig. 24 View Fig ; Table 14

Imitoceras sphaeroidale Vöhringer, 1960: 143 , pl. 2 fig. 7.

Acutimitoceras sphaeroidale – Korn 1994: 49, text-figs 49e, 55c.

Acutimitoceras (Stockumites) sphaeroidale – Becker 1996: 36.

non Acutimitoceras sphaeroidale – Vöhringer 1960: 143, text-fig. 21. — Korn 1992b: 17, pl. 2 figs 30– 31; 1994: text-figs 50f, 51b, 55d. — Schönlaub et al. 1992: pl. 5 figs 30–31.

Diagnosis

Species of Kornia with a thickly pachyconic, involute conch (ww/dm ~0.80; uw/dm ~0.05) at 24 mm conch diameter. Ornament with widely spaced growth lines with convex course and a shallow ventral sinus.

Material examined

Holotype

GERMANY • Rhenish Mountains, Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 5; Vöhringer Coll.; illustrated by Vöhringer (1960: pl. 2 fig. 7) and Korn (1994: text-fig. 49e); re-illustrated here in Fig. 24 View Fig ; GPIT-PV- 63865.

Additional material

GERMANY • 1 specimen; Rhenish Mountains, Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 5a1; Weyer 1993–1994 Coll.; MB.C. 31068 .

Description

Holotype GPIT-PV-63865 ( Fig. 24A View Fig ) is a thickly pachyconic specimen with 24 mm dm (ww/dm = 0.82). It has a slightly opened umbilicus (uw/dm = 0.06) and a low coiling rate (WER = 1.67). The specimen bears small shell remnants that possess widely spaced, lamellar growth lines; these extend in a low and wide arc across the flanks and form a broad and shallow ventral sinus. Parallel to this extend faint inner shell thickenings ( Fig. 24B View Fig ).

Specimen MB.C.31068 is a rather well-preserved specimen with 13 mm conch diameter ( Fig. 24C View Fig ). It is globular and subinvolute (ww/dm = 0.91; uw/dm = 0.19) with a low coiling rate (WER = 1.56). The whorl profile is C-shaped with rounded umbilical margin and steep, flattened umbilical wall. The shell bears lamellar growth lines directed slightly backwardly from the umbilical margin and forming a shallow, very broad sinus on the venter. There is one shell constriction that extends parallel to the growth lines.

Remarks

Vöhringer (1960) united two species under the name “ Imitoceras sphaeroidale ”. Holotype GPIT- PV-63865 is a nearly globular specimen with 24 mm dm (ww/dm = 0.82), but the illustrated cross section GPIT-PV-63927 (ww/dm = 0.69 at 15 mm dm) and the smaller specimen GPIT-PV-63932 belong to a much more slender form. This is newly described here as Hasselbachia erronea sp. nov. Unfortunately, the morphology of the inner whorls is not known.

Kingdom

Animalia

Phylum

Mollusca

Class

Cephalopoda

Order

Goniatitina

Family

Prionoceratidae

Genus

Kornia

Loc

Kornia sphaeroidalis ( Vöhringer, 1960 )

Korn, Dieter & Weyer, Dieter 2023
2023
Loc

Acutimitoceras (Stockumites) sphaeroidale

Becker R. T. 1996: 36
1996
Loc

Acutimitoceras sphaeroidale

Korn D. 1994: 49
1994
Loc

Imitoceras sphaeroidale Vöhringer, 1960: 143

Vohringer E. 1960: 143
1960
Loc

Acutimitoceras sphaeroidale

Korn D. 1992: 17
Schonlaub H. P. & Attrep M. & Boeckelmann K. & Dreesen R. & Feist R. & Hahn G. & Klein H. - P. & Korn D. & Kratz R. & Magaritz M. & Schramm J. - M. 1992: 38
Vohringer E. 1960: 143
1960
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