Angelinoceras undetermined
| Main Authors: | Aubrechtová, Martina, Korn, Dieter |
|---|---|
| Format: | info publication-taxonomictreatment Journal |
| Terbitan: |
, 2022
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6347612 |
Daftar Isi:
- Angelinoceras sp. Fig. 28B, Table 7 Material examined GERMANY • 1 spec.; Brandenburg, Oderberg; Ordovician, Upper Red Orthoceratite Limestone; Krueger Coll.; MB.C.29658. Description Specimen MB.C.29658 (Fig. 28B) consists of the coiled part (coiling tight; 33 mm diameter; WWI = 0.66; WER dm = 2.20 and WER ah = 2.30) of a conch. The shell surface is only locally and indistinctly preserved. Narrow annuli are separated by very thin lirae and both form a deep ventral sinus, which is delineated by paired longitudinal grooves. Remarks The specimen represents an Angelinoceras as indicated by its conch ratios and type of ornament. The specimen differs from A. latum in the smaller, tightly coiled conch with a slightly lower whorl expansion rate. The incomplete preservation of the last whorl and of the early uncoiled part makes it difficult to decide whether the specimen should be assigned to a new species or whether it only reflects morphological variation within A. latum.
- Published as part of Aubrechtová, Martina & Korn, Dieter, 2022, Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician), pp. 1-108 in European Journal of Taxonomy 799 (1) on pages 43-44, DOI: 10.5852/ejt.2022.799.1681, http://zenodo.org/record/6341270