Vestinautilus angulatus, Korn & Bockwinkel, 2022
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publication ID |
https://doi.org/ 10.5852/ejt.2022.831.1871 |
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publication LSID |
lsid:zoobank.org:pub:EAA2EAE2-DA8B-4516-B332-CB8423B8EEAA |
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DOI |
https://doi.org/10.5281/zenodo.6903114 |
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persistent identifier |
https://treatment.plazi.org/id/6A498E25-5D60-4511-8BF2-5C868B8D12DF |
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taxon LSID |
lsid:zoobank.org:act:6A498E25-5D60-4511-8BF2-5C868B8D12DF |
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treatment provided by |
Felipe |
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scientific name |
Vestinautilus angulatus |
| status |
sp. nov. |
Vestinautilus angulatus sp. nov.
urn:lsid:zoobank.org:act:6A498E25-5D60-4511-8BF2-5C868B8D12DF
Figs 14–15 View Fig View Fig , Table 8
Diagnosis
Species of Vestinautilus with depressed, rounded-trapezoidal whorl profile (ww/wh ~1.50), venter flattened, bordered by two sharp ridges, ventrolateral shoulder angular with sharp longitudinal ridges. Whorls not embracing. Ornament with two or three weak but sharp ridges on the flank.
Etymology
From the Latin ‘ angulatum ’, referring to the two angular ventrolateral ridges.
Type material
Holotype ALGERIA • Mouydir , south of Oued Temertasset (locality MOU-E07); Argiles de Teguentour (Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian); Korn et al. 2002 Coll.; illustrated in Fig. 14B View Fig ; MB.C.30461.1 .
Paratypes ALGERIA • 1 specimen; 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. 14A View Fig ; MB.C.30462.1 • 1 specimen; Mouydir , south of Oued Temertasset (locality MOU-E07); Argiles de Teguentour (Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian); Korn et al. 2002 Coll.; illustrated in Fig. 14C View Fig ; MB.C.30461.2 • 19 specimens; Mouydir , south of Oued Temertasset (localities MOU-D1, MOU-A, MOU-B1, MOU-C4, MOU-D2, MOU-V, MOU-Z); Argiles de Teguentour (Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian); Korn et al. 2002 Coll.; MB.C.30462.2 – MB.C.30462.5 , MB.C.30463.1 – MB.C.30463.5 , MB.C.30464.1 – MB.C.30464.2 , MB.C.30465.1 – MB.C.30465.3 , MB.C.30466.1 – MB.C.30466.3 , MB.C.30467 , MB.C.30468 • 1 specimen; Sebkha de Timimoun 11 km south-west of Timimoun (locality TIM-B0); Grès de Kahla supérieur (Upper Pericyclus-Progoniatites Assemblage; early late Tournaisian); Korn et al. 2002 Coll.; MB.C.30469 .
Description
Holotype MB.C.30461.1 is a phragmocone segment of about a quarter whorl with almost 9 mm whorl height ( Fig. 14B View Fig ). It shows a triangular whorl profile with a shallow, almost flat venter that is bordered on both sides by two elevated, sharp longitudinal ridges. Flanks, umbilical wall and dorsum form a broadly curved, semi-circular unit. On the flanks there are two longitudinal ridges, which are considerably weaker than the ridges on the ventrolateral shoulder ( Fig. 15C View Fig ). The suture line shows a deep, broadly rounded outer lobe and a ventrolateral saddle which has two crests because of the two longitudinal ridges. The lateral lobe is very broad and continues into a very low internal saddle ( Fig. 15D View Fig ).
The two paratypes MB.C.30462.1 (9 mm wh; Fig. 14A View Fig ) and MB.C.30461.2 (7 mm wh; Fig. 14C View Fig ) are very similar to the holotype in conch form and suture line. The two-humped ventrolateral saddle is also pronounced in paratype MB.C.30462.1 ( Fig. 15B View Fig ).
Remarks
Vestinautilus angulatus sp. nov. belongs to the few species of the genus with a moderately depressed whorl profile (ww/wh ~1.50) and a very weak longitudinal sculpture; in these respects, the new species differs from all other species of the genus in which the whorls are not embracing.
Table 8. Conch dimensions (in mm) and ratios of Vestinautilus angulatus sp. nov.
| Specimen | dm | ww | wh | uw | ah | ww/dm | ww/wh | uw/dm | WER | IZW |
|---|---|---|---|---|---|---|---|---|---|---|
| MB.C.30462.1 | – | 14.1 | 9.0 | – | – | – | 1.56 | – | – | – |
| MB.C.30461.1 | – | 12.7 | 8.8 | – | – | – | 1.44 | – | – | – |
| MB.C.30461.2 | – | 9.5 | 7.0 | – | – | – | 1.36 | – | – | – |
| MB |
Universidade de Lisboa, Museu Bocage |
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