محفوظ في:
| المؤلفون الرئيسيون: | , |
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| التنسيق: | Recurso digital |
| اللغة: | |
| منشور في: |
Zenodo
2023
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://doi.org/10.5281/zenodo.8184497 |
| الوسوم: |
إضافة وسم
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جدول المحتويات:
- <p><b><i>Gattenpleura concava</i> (Vöhringer, 1960) comb. nov.</b></p><p>Figs 10C, 89–90; Tables 87–88</p><p><i>Gattendorfia concava</i> Vöhringer, 1960: 157, pl. 5 fig. 2, text-fig. 32.</p><p><i>Gattendorfia concava</i> – Korn 1994: 74, text-figs 65d, 66k, 67f. — Kullmann 2000: text-fig. 4l; 2009: text-fig. 3.6c. — Korn & Weyer 2003: 100, pl. 2 figs 16–17.</p><p><b>Diagnosis</b></p><p>Species of <i>Gattenpleura</i> with a conch reaching 30 mm diameter. Conch at 15 mm dm thickly discoidal, subinvolute (ww/dm ~0.48; uw/dm ~0.22). Whorl profile at 15 mm dm weakly compressed (ww/wh ~0.95); coiling rate low (WER ~1.70). Venter rounded, umbilical margin raised and narrowly rounded, accompanied by a dorsolateral spiral groove. Growth lines very fine, narrow-standing, with convex course. With shallow constrictions on the shell surface; with weak internal shell thickenings. Suture line with narrowly lanceolate external lobe and V-shaped adventive lobe.</p><p><b>Material examined</b></p><p><b>Holotype</b></p><p>GERMANY • Rhenish Mountains, Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 4; Vöhringer Coll.; illustrated by Vöhringer (1960: pl. 5 fig. 2) and Korn (1994: text-fig. 65d); re-illustrated here in Fig. 89; GPIT-PV-63926.</p><p><b>Paratype</b></p><p>GERMANY • Rhenish Mountains, Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 4; Vöhringer Coll.; GPIT-PV-63920.</p><p><b>Additional material</b></p><p>GERMANY • 1 specimen; Rhenish Mountains, Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 3c; Vöhringer Coll.; MB.C.31175 • 1 specimen; Rhenish Mountains, Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 3e; Vöhringer Coll.; MB.C.31176 • 1 specimen; Rhenish Mountains, Oberrödinghausen, railway cutting; Hangenberg Limestone, bed 3a; Weyer 1993–1994 Coll.; MB.C.31177 • 1 specimen; Rhenish Mountains, Oese, old quarry; Hangenberg Limestone, bed 28; Weyer & Korn 2000 Coll.; MB.C.5260.1.</p><p><b>Description</b></p><p>Holotype GPIT-PV-63926 is a moderately well-preserved specimen with 19 mm conch diameter (Fig. 89). The conch is thinly discoidal and involute (ww/dm ~0.42; uw/dm ~0.10) with a moderate coiling rate (WER = 1.75). The whorl profile is characteristic with a slightly raised umbilical margin, which is accompanied on the flank by a shallow spiral groove; the venter is broadly rounded. The shell ornament consists of delicate growth lines with convex course.</p><p>The sectioned paratype GPIT-PV-63920 provides a view into the conch ontogeny between 2.5 and 18 mm diameter (Fig. 90A). In this interval, the whorl profile changes from originally crescent-shaped to circular to slightly compressed. The dorsolateral groove is formed at about 12 mm conch diameter. The suture line of the paratype has a lanceolate external lobe, inverted U-shaped ventrolateral saddle and a V-shaped adventive lobe with slightly convex flanks (Fig. 90B).</p><p><b>Remarks</b></p><p><i>Gattenpleura concava</i> differs from the other species of the genus by the lack of radial folds.</p>