Heterosubulites longusapertura, Ketwetsuriya & Karapunar & Charoentitirat & Nützel, 2020

Ketwetsuriya, Chatchalerm, Karapunar, Baran, Charoentitirat, Thasinee & Nützel, Al- Exander, 2020, Middle Permian (Roadian) gastropods from the Khao Khad Formation, Central Thailand: Implications for palaeogeography of the Indochina Terrane, Zootaxa 4766 (1), pp. 1-47 : 34

publication ID	https://doi.org/ 10.11646/zootaxa.4766.1.1
publication LSID	urn:lsid:zoobank.org:pub:B1B5DA41-5035-4783-8D47-28857B6305AE
DOI	https://doi.org/10.5281/zenodo.3803831
persistent identifier	https://treatment.plazi.org/id/03B587AB-4F16-155F-FF51-78E7FBD7FCB9
treatment provided by	Carolina
scientific name	Heterosubulites longusapertura
status	sp. nov.

Treatment

Heterosubulites longusapertura sp. nov.

( Fig. 22G View FIGURE 22 )

Etymology. Latin, because of the long-shape aperture.

Holotype. Only one specimen: ESKU-19-LP 215 .

Dimensions (mm): ESKU-19- LP 215: height = 1.6; width = 0.9; apical angle = 82 º.

Type locality and stratigraphical range. Erawan Hill, Chong Sarika sub-district, Phatthana Nikhom district, located about 13 km east of Lopburi Province, Central Thailand ( Fig. 1 View FIGURE ), Khao Khad Formation, Saraburi Group, Middle Permian, Roadian.

Description. Shell very small, fusiform; whorls smooth; whorls embracing high on the whorls; whorls evenly convex with periphery above mid-whorl; spire whorls only slightly convex; spire small, blunt, rounded; body-whorl inflated, much higher than spire with height about 90% of total height; sutures indistinct; base flat; aperture elongated, narrow, with wide and short anterior siphonal canal; outer lip almost straight.

Remarks. Heterosubulites longusapertura sp. nov. is very close to the type species H. blatta ( Knight, 1931 a, p. 203–204, pl. 21, fig. 2a–d) (see also Bandel 2002 a) from the Pennsylvanian of Missouri, USA in shape, size and shell proportions, but H. longusapertura n. sp. differs from H. blatta having a narrower aperture, a much broader anterior siphonal canal and a much more arched outer lip. H. fusiformis Nützel, 2012 from the Middle Permian Akasaka Limestone, Japan is also similar but its shell is larger, the shell is more slender, whorls embrace lower on preceding whorl, its aperture is wider and its anterior siphonal canal is narrower.