Profil taxonu
Obrázky
Autor: Vermeulen, J.J.
Popis
Material seen. — SARAWAK. 4th Div.: Bt. Sarang, Tatau Valley (leg. Bong, UF 194756/2; do. 194757/8; do. 194772/MO, incl. HOLOTYPE; do. 194921/1; do. 194922/MO; do. 194923/6; do. 194924/1; do. 194925/1).
As the type subspecies, but constriction usually with a parietalis which continues up to or slightly beyond the sharp inner curve of the tuba, and which is low and incon¬spicuous, (or even absent) at the constriction, but high and distinct half-way the tuba, without an angularis. Spire with 6 radial ribs/0.5 mm on the penultimate whorl; tuba with 5-20 ribs/0.5 mm half-way. Umbilicus closed, or open, up to 0.05 mm wide. Spire: height 0.7-0.8 mm; width 0.7 mm; index 1.0-1.2. Total width 1.0-1.1 mm. Height and width aperture 0.30 mm.
Distribution. — Sarawak. 4th Div. Tatau River basin.
Notes: — In the type subspecies the umbilicus is usually wider, being 0.05-0.25 mm across.
As the type subspecies, but constriction usually with a parietalis which continues up to or slightly beyond the sharp inner curve of the tuba, and which is low and incon¬spicuous, (or even absent) at the constriction, but high and distinct half-way the tuba, without an angularis. Spire with 6 radial ribs/0.5 mm on the penultimate whorl; tuba with 5-20 ribs/0.5 mm half-way. Umbilicus closed, or open, up to 0.05 mm wide. Spire: height 0.7-0.8 mm; width 0.7 mm; index 1.0-1.2. Total width 1.0-1.1 mm. Height and width aperture 0.30 mm.
Distribution. — Sarawak. 4th Div. Tatau River basin.
Notes: — In the type subspecies the umbilicus is usually wider, being 0.05-0.25 mm across.
Vermeulen, J.J., 1994. Notes on the non-marine molluscs of the island of Borneo 6. The genus Opisthostoma (Gastropoda Prosobranchia: Diplommatinidae), part 2
Autor: Jan Delsing