Early Carboniferous nautiloids from the Central Sahara, southern Algeria
Author
Korn, Dieter
286CA4F3-7EBC-4AEF-A66A-B2508D001367
Museum für Naturkunde, Leibniz Institut for Research on Evolution and Biodiversity, Invalidenstrasse 43, 10115 Berlin, Germany.
dieter.korn@mfn.berlin
Author
Bockwinkel, Jürgen
F7FE7EEA-B678-4FEE-879C-8C429F66BF3A
Dechant-Fein-Strasse 22, 51375 Leverkusen, Germany.
jbockwinkel@t-online.de
text
European Journal of Taxonomy
2022
2022-07-20
831
67
108
http://dx.doi.org/10.5852/ejt.2022.831.1871
journal article
105313
10.5852/ejt.2022.831.1871
e697ba5c-5a96-4a28-985c-748890333d6c
2118-9773
6885198
EAA2EAE2-DA8B-4516-B332-CB8423B8EEAA
Stroborineceras felis
gen. et sp. nov.
urn:lsid:zoobank.org:act:
406664D9-FD31-430B-8988-AD7510B6B36A
Fig. 8
,
Table 3
Diagnosis
Species of
Stroborineceras
gen. nov.
with weakly depressed, rounded-pentagonal whorl profile (ww/wh ~1.20), venter concave, ventrolateral shoulder angular. Whorls not embracing. Ornament with five faint spiral ridges located on the flank.
Etymology
From the Latin ‘
felis
’, meaning ‘cat’ and referring to the characteristic whorl profile resembling a cat’s head.
Type material
Holotype
ALGERIA
•
Mouydir
,
south of Oued Temertasset (locality MOU-D1)
;
Argiles de Teguentour
(
Upper
Pericyclus-Progoniatites
Assemblage; early late Tournaisian
);
Korn
et al
.
2002 Coll.; illustrated in
Fig. 8A
;
MB.C.30454
.
Description
Holotype
MB.C.30454 is a phragmocone fragment of slightly less than 90 degrees in length (
Fig. 8A
). It reaches a whorl height of
13 mm
and the profile is weakly depressed (ww/wh = 1.22). The characteristic whorl profile has the outline of a cat’s head shape (
Fig. 8B
); its general shape is rounded-pentagonal. The venter is concavely incurved and is bordered by the very prominent, angular ventrolateral shoulder. The profile is widest at the middle of the whorl height; from here the flanks converge with a slight concave incurvation. The dorsum is broadly rounded. On the flank about five spiral lines are visible; they become weaker towards the dorsum. The suture line shows a deep, almost semicircular external lobe, a subacute ventrolateral saddle, a shallow, very broadly rounded lateral lobe and a very broad, low internal saddle (
Fig. 8C
).
Fig. 8.
Stroborineceras felis
gen. et sp. nov.
, holotype MB.C.30454 (Korn
et al
. 2002 Coll.) from Oued Temertasset.
A
. Ventral and lateral views.
B
. Whorl profile.
C
. Suture line, at ww =15.6 mm, wh=
12.7 mm
. Scale bar units =
1 mm
.
Table 3.
Conch dimensions (in mm) and ratios of
Stroborineceras felis
gen. et sp. nov.
| Specimen |
dm |
ww |
wh |
uw |
ah |
ww/dm |
ww/wh |
uw/dm |
WER |
IZW
|
| MB.C.30454 |
– |
16.0 |
13.1 |
– |
– |
– |
1.22 |
– |
– |
– |
Remarks
Stroborineceras felis
gen. et sp. nov.
differs from
S.
insalahensis
gen. et sp. nov.
by the less depressed whorl profile (ww/wh ~
1.25 in
S. felis
gen. et sp. nov.
but ~
1.55 in
S. insalahensis
gen. et sp. nov.
), by the concave venter (flattened or weakly convex in
S. felis
gen. et sp. nov.
) and by the considerably weaker spiral lines (coarse and sharp in
S. insalahensis
gen. et sp. nov.
).