Inyoites sedini, 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-E130-8837-3BAA-EFC87D3788A1 |
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treatment provided by |
Felipe |
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scientific name |
Inyoites sedini |
| status |
sp. nov. |
Inyoites sedini View in CoL sp. nov.
Figs. 9B View Fig , 10A View Fig .
Etymology: Named after Alexander Sedin (Institute of Pacific Oceanology, Vladivostok, Russia).
Holotype: DVGI 1 /850, fully preserved adolescent phragmocone.
Type locality: SMID quarry at Artyom environs, South Primorye.
Type horizon: Zhitkov Formation, Mesohedenstroemia bosphorensis Zone of Zakharov (1978) (found in a floated nodule in suitable ammonoid association).
Diagnosis.—Thinly discoidal, evolute Inyoites , with a weak ventral keel and small auxiliary lobe, serrated at the base.
Description.—The shell is thinly discoidal, evolute, with lanceolate venter and a week keel, rounded ventral shoulders and slightly convex flanks. Umbilicus wide, with low, oblique wall and rounded shoulders.
The surface is ornamentated with dense, radial ribs that run from the umbilicus sinuously up the sides and disappear below the base of the keel.
The ventral lobe (V) is subdivided by a high and wide median saddle into two branches, serrated at the base and within the median saddle wall. The first and second lateral saddles are large, the third one is significantly smaller. The lateral lobe (L) is deep and wide, the first umbilical lobe (U 1) is somewhat shorter, both are serrated at the base. The auxiliary lobe (U 3) is significantly smaller, but still serrated.
Dimensions in mm and ratios:
Specimen no. D H W U H/D W/D U/D Holotype DVGI 1 /851 66.7 23.8 12.6 27.3 0.36 0.19 0.41
Remarks.—The new species is distinguished from Inyoites spicini Zakharov, 1968 from South Primorye by considerably more evolute shell and weeker keel, from I. oweni Hyatt and Smith, 1905 from California by somewhat considerably more evolute shell, weeker keel and more denticulated ventral lobe, from I. krystyni Brayard and Bucher, 2008 from South China by more complex outline of the the umbilical portion of the suture and weeker keel, from I. striatus Chao, 1959 and I. oblicatus Chao, 1959 from South China by more strongly evolute shell.
Stratigraphic and geographic range.— Type locality and type horizon only.
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