Oxytesta siyomensis Godwin-Austen, 1918
publication ID |
https://doi.org/ 10.26515/rzsi/v122/i4/2022/166818 |
persistent identifier |
https://treatment.plazi.org/id/03978798-FF9F-885B-FC8A-FB12FE9F055C |
treatment provided by |
Felipe |
scientific name |
Oxytesta siyomensis Godwin-Austen, 1918 |
status |
|
Oxytesta siyomensis Godwin-Austen, 1918 View in CoL
1916. Oxytes siyomensis Godwin-Austen, Rec. Indian Mus. , 8: 595, pl.
52. figs 3, 3a, 3b.
Material Examined: ZSI/IV/ APRC /M-319, 1 ex. Ramsingh (28°14’05.7”N 95°13’05.1”E, 336 msl), Upper Siang district, Arunachal Pradesh, 27.10.2017. coll., G. Maheswaran, et al.,; ZSI/ IV/ APRC / M-321, 2 ex. Ramsingh (28°38’41.0”N 94°59’54.0” E, 356 msl), Upper Siang district , Arunachal Pradesh, 01.12.2020.10.2017, coll., SD Gurumayum GoogleMaps .
Shell Measurements: Largest: 21mm (width), 8mm (axis); Smallest: 19mm (width), 7mm (axis).
Original type description by Godwin-Austen : Locality. Siyom Valley, Abor Hills (Long. 94° 40’ and Lat. 28° 30’) high up [Capt. Oakes, R.E.).
Shell openly perspectively umbilicated, rather solid, lenticular depressed, sharply keeled; sculpture fine close transverse striation, on base close pitting; colour bleached in type, pale umber in a second specimen; spire fairly high, apex rounded, sides flatly convex; suture linear; whorls Shantabala Devi Gurumayum 5, regularly increasing; aperture semilunate, subvertical; peristome: upper margin sinuate, compressed towards keel so as to be concave, lower margin oblique. Size: major diameter 25*0, minor 21-5, alt. axis 7-0 mm. This differs from aborensis, a close ally, in being more solid and not so extremely flat. A smaller specimen from the same valley has the peristome much thickened. Major diam. 24*0, alt, axis 68 mm.
Remarks: Oxytesta siyomensis closely resembles O. aborensis however differs by having a more solid shell and not so extremely flat dorsal side. The peristome of O. siyomensis has more sudden depression as compared to O. aborensis .
R |
Departamento de Geologia, Universidad de Chile |
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.
Kingdom |
|
Phylum |
|
Class |
|
Order |
|
Family |
|
Genus |