Boreiodeltoideum Kosenko, 2016a
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publication ID |
https://doi.org/ 10.4202/app.00387.2017 |
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persistent identifier |
https://treatment.plazi.org/id/40598788-F46F-FFAB-FFB2-FBDE57B7F904 |
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treatment provided by |
Felipe |
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scientific name |
Boreiodeltoideum Kosenko, 2016a |
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Subgenus Boreiodeltoideum Kosenko, 2016a
Type species: Ostrea (Liostrea) anabarensis Bodylevsky, 1949 ; Upper Valanginian of the Anabar River (north of Eastern Siberia) .
Diagnosis.— Shells medium to large,inequivalve.LV slightly convex, RV flat. Outlines deltoid to crescent. Umbo opisthogyrate. Ligament area ostreoid, small to medium, triangular to trapezoidal. Angle between LA and commissural plane very small (less than 10°). Resilifer triangular, wide, deeper on LV. Height of posterior bourrelet usually much smaller than height of anterior bourrelet. Attachment area small to large. Umbonal cavity absent, some species have a poorly developed depression located under the posterior bourrelet. PAM medium-sized, circular to length-oval in a posterocentral or posterodorsal position. No chomata. Outer surface of valves covered by concentric growth striae.
Stratigraphic and geographic range.— Upper Jurassic (Kimmeridgian)–Lower Cretaceous (Hauterivian) of Siberia.
| RV |
Collection of Leptospira Strains |
| PAM |
Pennsylvania Department of Agriculture |
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