Aulacospira depressa Dumrongrojwattana & Panha, 2006 Figures 2A, 3A

Aulacospira depressus Dumrongrojwattana and Panha 2006: 121-122, fig. 2.

Remarks.

The specific epithet " depressus " must be corrected to " depressa " to agree in gender with Aulacospira (musculine).

Type locality.

Thailand, Khao Chakan, an isolated limestone hill of Srakeo Province; 13°48'02"N, 102°12'49"E; ca 85 m a.s.l.

Types examined.

Holotype. ZRCBUU 0076 (BuUZM-MS 0076) (Fig. 2A, B). Paratype. ZRCBUU 0077 (BuUZM-MS 0077).

Material examined.

ZRCBUU 0078 (BuUZM-MS 0078) (3 shells); Thailand, Khao Chakan, an isolated limestone hill of Srakeo Province; 13°48'02"N, 102°12'49"E; ca 85 m a.s.l.; 8.vi.2003; leg. Dumrongrojwattana P. ZRCBUU 0096 (BuUZM-MS 0096) (24 shells); 19.iv.2003; leg. Dumrongrojwattana, P. ZRCBUU 0352 (10 shells); Thailand, Khao Chakan, an isolated limestone hill of Srakeo Province; 13°48'02"N, 102°12'49"E, ca 85 m a.s.l.; 18.i.2020; leg. Dumrongrojwattana, P.

Measurements.

H = 0.97-1.14 mm, W = 2.51-3.15 mm.

Diagnosis.

Shell minute, very depressed; spire very low; brownish. Protoconch smooth; teleoconch smooth; body whorl large, with a prominent groove which forms two carinae; tuba very short; peristome expanded; aperture lacking teeth (Fig. 2A).

Radula.

Central tooth small, unicuspid, triangular. Laterals irregularly bicuspid and consisting of a large internal cusp near and adjacent to a smaller, shorter outer cusp. Four laterals on each side of central tooth; first tooth largest, other teeth sequentially smaller. Marginals also irregularly, unequally bicuspid, with internal cusp larger than outer cusp. Marginal teeth 7 or 8 on each side of central tooth (Fig. 3A).

Radula formula. 7-8:4:1:4:7-8.

Genital system.

Unknown.

Distribution.

This species is known only from the type locality (Fig. 1).