Stockumites undulatus ( 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 : 62-64

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.8184742

persistent identifier

https://treatment.plazi.org/id/03EA5C14-CA34-8570-FE13-FE98FAF1800B

treatment provided by

Felipe

scientific name

Stockumites undulatus ( Vöhringer, 1960 )
status

comb. nov.

Stockumites undulatus ( Vöhringer, 1960) comb. nov.

Figs 37–38 View Fig View Fig ; Tables 32–33 View Table 32 View Table 33

Imitoceras undulatum Vöhringer, 1960: 133 , pl. 3 fig. 6, text-fig. 13.

Acutimitoceras undulatum – Korn 1994: 52, text-figs 49h–i, 50l, 52c, 55e–f. — Korn et al. 1994: text-fig. 20a.

Diagnosis

Species of Stockumites with a conch reaching 40 mm diameter. Conch at 5 mm dm thinly pachyconic, subinvolute (ww/dm ~0.70; uw/dm ~0.25); at 12 mm dm thinly pachyconic, subinvolute (ww/dm ~0.65; uw/dm ~0.05); at 20 mm dm thickly discoidal, involute (ww/dm ~0.55; uw/dm ~0.02). Whorl profile at 20 mm dm weakly compressed (ww/wh ~0.95); coiling rate moderately high (WER ~1.90). Venter broadly rounded, umbilical margin broadly rounded. Growth lines lamellar, wide-standing, with biconvex course. Without constrictions on the shell surface; without internal shell thickenings. Suture line with V-shaped external lobe and V-shaped adventive lobe.

Material examined

Holotype

GERMANY • Rhenish Mountains, Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 5; Vöhringer Coll .; illustrated by Vöhringer (1960: pl. 3 fig. 6) and Korn (1994: text-fig. 49i); re-illustrated here in Fig. 37A View Fig ; GPIT-PV-63877.

Paratypes

GERMANY • 1 specimen; Rhenish Mountains , Oberrödinghausen, railway cutting; Hangenberg Limestone,bed5;Vöhringer Coll.;GPIT-PV-64022• 2specimens;Rhenish Mountains,Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 6; Vöhringer Coll.; GPIT-PV-63879, GPIT-PV-63881.

Additional material

GERMANY • 1 specimen; Rhenish Mountains, Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 6; Vöhringer Coll.; MB.C.31089 • 1 specimen; Rhenish Mountains, Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 5c; Weyer 1993–1994 Coll.; MB.C.31090 • 1 specimen; Rhenish Mountains, Oberrödinghausen , railway cutting ; Hangenberg Limestone , bed 6a; Weyer 1993– 1994 Coll.; MB.C.31091 • 1 specimen; Rhenish Mountains, Oese , old quarry ; bed interval III ; Paproth Coll.; MB.C.5271.

Description

Holotype GPIT-PV-63877 is a specimen that is largely covered with shell and has 23 mm diameter ( Fig. 37A View Fig ). It is thickly discoidal (ww/dm = 0.52) with a closed umbilicus. The conch is widest at the rounded umbilical margin; from there the flanks converge to the continuously rounded venter. The ornament consists of lamellar growth lines with a biconvex course; the dorsolateral projection and ventrolateral projection have about the same height ( Fig. 38E View Fig ).

Paratype GPIT-PV-63879 with 20.5 mm diameter is very similar to the holotype in conch parameters and ornament ( Fig. 37B View Fig ). The suture line has a lanceolate external lobe, accompanied by an asymmetrical ventrolateral saddle. The almost symmetrical adventive lobe is broadly lanceolate with outwardly curved flanks ( Fig. 38C View Fig ).

Specimen MB.C.31091 shows the ornament in particularly good preservation ( Fig. 38A View Fig ). The lamellar growth lines with biconvex course form a dorsolateral projection on the inner third of the flank, a shallow lateral sinus on the outer third of the flank and a ventrolateral projection on the ventrolateral shoulder.

Remarks

Stockumites undulatus is an easily recognisable species because it is clearly distinguished from all other species of the genus by the characteristic, lamellar growth lines with a distinctive biconvex course.

Kingdom

Animalia

Phylum

Mollusca

Class

Cephalopoda

Order

Goniatitida

Family

Prionoceratidae

Genus

Stockumites

Loc

Stockumites undulatus ( Vöhringer, 1960 )

Korn, Dieter & Weyer, Dieter 2023
2023
Loc

Acutimitoceras undulatum

Korn D. 1994: 52
Korn D. & Ebbighausen V. & Bockwinkel J. & Klug C. 1994: 62
1994
Loc

Imitoceras undulatum Vöhringer, 1960: 133

Vohringer E. 1960: 133
1960
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