Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane Author Ketwetsuriya, Chatchalerm Author Karapunar, Baran Author Charoentitirat, Thasinee Author Nützel, Al- Exander text Zootaxa 2020 2020-04-17 4766 1 1 47 journal article 10.11646/zootaxa.4766.1.1 ed4d1bf6-284a-4898-952a-58943d5a3026 1175-5334 3763907 urn:lsid:zoobank.org:pub:B1B5DA41-5035-4783-8D47-28857B6305AE Peruvispira sp. ( Fig. 12 ) Material. Two specimens: ESKU-19- LP 10, 68. Dimensions (mm): ESKU-19- LP 10: height = c . 2.7; width = c . 2.0. ESKU-19- LP 68: height = c . 3.3; width = 3.1. Description. Shell small, conical, moderately high-spired; suture distinct, situated just below basal edge; whorl face above selenizone slightly convex near suture, concave above selenizone, ornamented with very faint, obliquely elongated, prosocline/prosocyrt subsutural nodes; upper whorl face three times as wide as the lower whorl face; selenizone wide, concave, slightly raised, situated at lower half of whorl face, bordered above and below by pronounced spiral cords; lower cord forms periphery; the whorl face below selenizone concave, smooth; basal edge rounded; base convex, smooth; aperture subovate, outer lip convex angular, basal lip convex, lower half of the columellar lip slightly reflexed; base anomphalous. Remarks. The whorl profile is very similar to that of Peruvispira turrita Yu, 1980 from the Permian of Guizhou, but it is not clear whether the latter species has subsutural nodes or not. P . allandalensis Fletcher, 1958 and P . trifilata ( Dana, 1847 ) from the Permian of Australia are other similar species but they differ in having collabral threads and a rather convex upper and lower whorl face.