Sinuarbullina yangouensis comb. nov. ...

• Main Authors: Foster, William J., Danise, Silvia, Twitchett, Richard J.
• Format: Text
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Architectibranchia; Acteonellidae; Sinuarbullina; Sinuarbullina yangouensis; Ramp The; Silvia; Svalbard; Teardrop; The Ramp
• Online Access: https://dx.doi.org/10.5281/zenodo.10903538; https://zenodo.org/doi/10.5281/zenodo.10903538

Sinuarbullina yangouensis (Pan, Erwin, Nutzel, & Xiang-Shui, 2003) comb. nov. (Fig. 13) 2003 Jiangxispira yangouensis Pan, Erwin, Nutzel, & Xiang-Shui: 44, fig. 3, 1–7. Material. Specimen lost by WJF after photography. Description. The shell is high-spired, slender and fusiform. Teleoconch whorls have a subsutural ramp. The ramp from the outer whorl face is rounded with a rib on the shell periphery. Whorls are smooth, except for growth lines which are prosocyrt on the outer whorl face curving in an apertural direction and become opisthocyrt towards the ramp. The surface of the shell shows a coloured spiral band around the subsutural ramp. The aperture is an elongated teardrop shape. Protoconch is heterostrophic, sinistral, nearly discoidal with lightly elevated spire 30 Ǫ offset from the shell axis; protoconch has 1–2 round whorls. Remarks. Seven species are included in Sinuarbullina, and S. convexa (= ‘ Cylindrobullina’ convexa) is the only accepted species from the Lower Triassic (Grundel & ... : Published as part of Foster, William J., Danise, Silvia & Twitchett, Richard J., 2017, A silicified Early Triassic marine assemblage from Svalbard, pp. 851-877 in Journal of Systematic Palaeontology 15 (10) on page 869, DOI: 10.1080/14772019.2016.1245680, http://zenodo.org/record/10883052 ...