Subbalhaeceras shigetai, Zakharov & Abnavi, 2013
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publication ID |
https://doi.org/ 10.4202/app.2011.0054 |
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persistent identifier |
https://treatment.plazi.org/id/9735F958-E131-8836-3B60-EEA37FA68C00 |
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treatment provided by |
Felipe |
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scientific name |
Subbalhaeceras shigetai |
| status |
sp. nov. |
Subbalhaeceras shigetai View in CoL sp. nov.
Figs. 9C View Fig , 10B View Fig .
Etymology: Named after Dr. Yasunari Shigeta (National Museum of Nature and Science, Tsukuba, Japan).
Holotype: DVGI 2 /851, fully preserved adolescent phragmocone.
Type locality: SMID quarry at Artyom environs, South Primorye.
Type horizon: Mesohedenstroemia bosphorensis Zone, Zhitkov Formation, Olenekian, Lower Triassic (see Zakharov 1978) (found in a float block).
Description.—The shell is thinly discoidal, semiinvolute, with tabulate to concave venter, subangular ventral shoulders and slightly convex flanks with maximum whorl width at about one thirds of whorl height. Umbilicus fairly broad with low, oblique wall and rounded shoulders. The surface is ornamentated with rare radial folds in inner whorls.
Suture ceratitic ( Fig. 10B View Fig ) with subphylloid saddles and very wide ventral lobe (V) subdivided by a low median saddle into two broad branches serrated in a complicated manner at their base and within the significant part of the median saddle. The second lateral saddle is larger, than the first and third ones. The lateral lobe (L) is deep, denticulated at the base and lower parts of its walls. The first umbilical lobe (U 1) is also deep, but wider then the L−lobe, denticulated at the base and lower parts of the one of its walls. The auxiliary series at external part of suture consists of some short lobes (U 3, U 5, U 7, and U 9), mainly bicaspid ones. A short radial rib was found at H = 14 mm.
Dimensions in mm and ratios:
Specimen no. D H W U H/D W/D U/D Holotype DVGI 2 /851 54.2 21.9 8.0 16.3 0.40 0.15 0.30
Stratigraphic and geographic range.— Type locality and type horizon only.
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