Paskentana berryessaensis, Kiel & Campbell & Elder & Little, 2008
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publication ID |
https://doi.org/ 10.4202/app.2008.0412 |
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persistent identifier |
https://treatment.plazi.org/id/03DC9B54-FFEF-3373-FF89-41D87A13CAA5 |
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treatment provided by |
Felipe |
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scientific name |
Paskentana berryessaensis |
| status |
sp. nov. |
Paskentana berryessaensis sp. nov.
Fig. 7A–C View Fig .
Etymology: After the type locality at Berryessa Lake, California, USA.
Type material: Holotype: UCMP 555098 View Materials , small specimen with nodular sculpture . Paratypes: UCMP 555099 View Materials from the type locality ; UCMP 555100 View Materials from Bear Creek (site 4), California, USA .
Type locality: NW Berryessa, Napa County, California, USA (site 10) .
Type horizon: Seep carbonate in the Tithonian (Upper Jurassic) of the Great Valley Group.
Material.— The type material and three additional specimen from Bear Creek (site 4).
Diagnosis.—Shell broad turbiniform, last whorl globose, apical angle 65°; whorls strongly convex, rounded or slightly angular; increasing number of nodular spiral cords through ontogeny; growth lines fine and prosocline; same sculpture on base but less strong.
Description.—Moderately high−spired shell with at least three teleoconch whorls; suture distinct, incised; number of spiral cords per whorl increases from 3 on early whorls to 6 on later ones, new spirals appear gradually between existing ones; spirals nodular at intersections with fine prosocline growth lines. The holotype is 36 mm high.
Discussion.—These specimens have the general shape and sculpture of P. paskentaensis but differ from “typical” P. paskentaensis by being much broader (having a wider apical angle). P. paskentaensis is generally highly variable regarding shell sculpture and whorl profile, but it appears to be relatively constant with regard to its apical angle.
Stratigraphic and geographic range.— Tithonian (Upper Jurassic) to Valanginian (Lower Cretaceous), seep carbonates at the NW Berryessa and Bear Creek localities of the Great Valley Group, California, USA.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.