Oospira zediopsis Man & Panha, 2023

Man, Nem Sian, Lwin, Ngwe, Sutcharit, Chirasak & Panha, Somsak, 2023, Further notes on the taxonomy of the land snail family Clausiliidae Gray, 1855 (Stylommatophora, Helicina) from Myanmar with description of two new species, ZooKeys 1160, pp. 1-59 : 1

13 Oospira zediopsis Man & Panha sp. nov.

Figs 16D-F , 19Q

Type material.

Holotype CUMZ 13064 (Fig. 16E ). Measurement: shell height 25 mm, shell width 6.5 mm and 10 whorls. Paratypes CUMZ 13065 (50 shells; Fig. 16D, F ), NHMUK 20220508 (2 shells) and JG-C 2884 (2 shells).

Type locality.

Weibyan Cave, Hpa-an Township, Hpa-an District, Kayin State, Myanmar (17°13'38.2"N, 97°37'24.0"E).

Etymology.

The specific name zediopsis is a compound word; ‘zedi’ is one of several terms in the Myanmar language that refer to a stupa or pagoda, and the Greek suffix - opsis means 'having the appearance of or like’. It refers to the Myanmar pagoda-like shell shape of this species.

Diagnosis.

Shell fusiform, with four to five white apical whorls, and nearly smooth shell surface. Inferior lamella straight ascending or almost flattened, palatal plicae lateral, equally oblique, superior lamella distinct at transition to spiralis, and clausilium plate lateral side and less bent inwards.

Description.

Shell fusiform, opaque, and chestnut-brown color; 4-5 apical whorls white and rapidly attenuated. Shell surface smooth to with very thin growth lines; suture impressed and distinct. Whorls 10-11, convex, regularly growing, and attenuated to apex. Aperture obliquely pear-shaped, and basis rounded; peristome slightly protruded, large, relatively thickened and slightly expanded. Superior lamella developed, connected to spiralis and slightly low at transition to spiralis. Inferior lamella steeply ascending, distant from superior lamella and ending at peristome. Subcolumellaris emerged and invisible in oblique view. Principalis running along lateral-dorsal side and anterior end visible through oblique apertural view. Palatal plicae lateral, four or five: first and fourth plicae strongest and longest; remaining plicae parallel and equal length; fifth plica smallest. Clausilium plate lateral side and narrow.

Distribution.

This species is only known from the type locality with plentiful shells collected.

Remarks.

No ethanol preserved specimens were available for anatomical study. Oospira gouldiana can be distinguished from O. zediopsis sp. nov. by its less ventricose shell, denser and stronger striations, more spiral inferior lamella, palatal plicae and clausilium more ventrally positioned, and principalis not visible from the aperture view. Likewise, O. shanensis can be differentiated from this new species by wider spacing between spiralis and inferior lamella, anterior end of inferior lamella reduced at peristome, longer palatal plicae, attached peristome, and clausilium wider and with a hook. Furthermore, O. zediopsis sp. nov. can be differentiated from O. insignis by its more attenuated spire, narrower and more oblique aperture, shorter and more equal palatal plicae.

Figures

Figure 16. Shell and clausilial apparatus of A-C Oospira luneainopsis sp. nov. A shell of holotype CUMZ 13062 from Zwekabin Mountain, Kayin State B, C paratypes CUMZ 13063 from the type locality B clausilial apparatus C shell and D-F Oospira zediopsis sp. nov. D clausilial apparatus of paratype CUMZ 13065 from the type locality E shell of holotype CUMZ 13064 from Weibyan Cave, Kayin State and F shell of paratype CUMZ 13065 from the type locality.

Figure 19. Synoptic view of the clausiliid species recorded from Myanmar A Phaedusa lypra, syntype MNHN-IM- 2000 - 2502 - 7 B Oospira magna, lectotype NHMUK 1901.3.17.156 C Oospira malaisei, holotype SMNH 3014 D Indonenia masoni, lectotype NHMUK 1888.12.4.1034 E Phaedusa bocki menglunanensis, specimen NHMUK 1903.7.1.3652 F Oospira mongmitensis, holotype UF 117571 (after Szekeres et al. 2021 b: fig. 1 d) G Oospira ovata, lectotype NHMUK 1906.2.2.378 H Oospira philippiana, possible syntype SMF 62294 / 1 I Oospira sardicola, holotype UF 117570 (after Szekeres et al. 2021 b: fig. 2 c) J Oospira shanensis, holotype NHMUK 1903.7.1.3544 K Phaedusa shanica, lectotype SMF 62260 L Oospira stoliczkana, holotype NHMUK 1888.12.4.1031 M Phaedusa theobaldi, lectotype NHMUK 1888.12.4.1056 N Phaedusa bocki thompsoni, specimen NHMUK 1903.7.1.1163 O Indonenia tuba, lectotype NHMUK 1907.12.30.241 P Oospira vespa, paralectotype MCZ 169456 and Q Oospira zediopsis sp. nov., holotype CUMZ 13064. Photo: P. Maestrati, MNHN (A), A Persson, SMNH (C).