Kornia fibula, 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 : 39-41

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.8187527

persistent identifier

https://treatment.plazi.org/id/D2D2D504-131B-4342-9CEC-4C8E29E433C1

taxon LSID

lsid:zoobank.org:act:D2D2D504-131B-4342-9CEC-4C8E29E433C1

treatment provided by

Felipe

scientific name

Kornia fibula
status

sp. nov.

Kornia fibula sp. nov.

urn:lsid:zoobank.org:act:D2D2D504-131B-4342-9CEC-4C8E29E433C1

Figs 25–26 View Fig View Fig ; Tables 15–16 View Table 15 View Table 16

Paragattendorfia View in CoL n. sp. I Korn & Weyer, 2003: 95, pl. 2 figs 20–21.

Paragattendorfia cf. sphaeroides Becker et al., 2021 : text fig. 3n–o.

Gattendorfia cf. crassa View in CoL – Becker 1997: 34, pl. 1 fig. 10.

Diagnosis

Species of Kornia with globular, moderately involute conch (ww/dm ~0.95; uw/dm ~0.15) at 12 mm conch diameter. Growth lines with very deep and wide external sinus.

Etymology

From the Latin ‘ fibula ’ = ‘clasp’, a connotation of the name of the type locality at Oese.

Material examined

Holotype

GERMANY • Rhenish Mountains , Oese , old quarry; Hangenberg Limestone, bed 28; Weyer & Korn 2000 Coll.; illustrated by Korn & Weyer (2003: pl. 2 figs 20–21); re-illustrated here in Fig. 25B View Fig ; MB.C.5260.3 .

Paratypes

GERMANY • 2 specimens; Rhenish Mountains, Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 2a; Weyer 1993–1994 Coll.; MB.C.31069.1–2 1 specimen; Rhenish Mountains, Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 3d1b; Weyer 1993–1994 Coll.; MB.C.31070 2 specimens; Rhenish Mountains , Oberrödinghausen , railway cutting; Hangenberg Limestone , bed 3d2; Weyer 1993–1994 Coll.; MB.C.31071.1–2 3 specimens; Rhenish Mountains , Oese , old quarry; Hangenberg Limestone, bed 22; Weyer & Korn 2000 Coll.; MB.C.5262.2 , MB.C.5262.4 , MB.C.5262.5 1 specimen; Rhenish Mountains , Letmathe, between Schälk and Grürmannsheide; Hangenberg Limestone; Denckmann 1901 Coll.; MB.C.1215 .

Description

Holotype MB.C.5260.3 ( Fig. 25B View Fig ), measuring 11.4 mm diameter, has an almost ball-shaped conch with a small umbilicus and a low aperture (ww/dm = 0.94; uw/dm = 0.15; WER = 1.46) and a C-shaped whorl profile. The ornament possesses lamellar growth lines that are strongly rursiradiate in their direction. They form a low dorsolateral projection and already on the inner flank turn back to extend with a deep and wide sinus across the outer flanks and the venter ( Fig. 26B View Fig ).

The larger paratype MB.C.31069.2 ( Fig. 25A View Fig ) with 16 mm conch diameter displays a similar growth line course, but with less strong backward turn. It has a globular, involute conch (ww/dm = 0.87; uw/ dm = 0.11).

The sectioned paratype MB.C.31069.1 allows the study of conch geometry between 4.7 and 19.2 mm diameter ( Fig. 26A View Fig ). During this growth interval, the whorl profile maintains a similar shape. The venter is broad and merges continuously into the convex flanks; the umbilical margin is rounded. The growth trajectories show an almost isometric ontogeny in this growth interval ( Fig. 26C–D View Fig ).

Remarks

Kornia fibula sp. nov. differs from K. acia sp. nov. in the ball-shaped juvenile conch (spindle-shaped in K. acia ) and wider umbilicus at 10 mm conch diameter (uw/dm = 0.15 in K. fibula but only 0.10 in K. acia ). The superficially similar Globimitoceras globiforme differs in the narrower umbilicus (uw/ dm ~ 0.15 in Kornia fibula but only 0.08 in G. globiforme at 10–15 mm dm).

Kingdom

Animalia

Phylum

Mollusca

Class

Cephalopoda

Order

Goniatitina

Family

Prionoceratidae

Genus

Kornia

Loc

Kornia fibula

Korn, Dieter & Weyer, Dieter 2023
2023
Loc

Paragattendorfia

Korn D. & Weyer D. 2003: 95
2003
Loc

Paragattendorfia cf. sphaeroides

Becker R. T. 1997: 34
1997
Loc

Gattendorfia cf. crassa

Becker R. T. 1997: 34
1997
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