Diplommatina welzeni Vermeulen, 1993
“Differs from D. gomantongensis in the columellaris which is just visible in the aperture. (Vermeulen, 1993)
Vermeulen (1993) original descriptions on Diplommatina welzeni – “Shell dextral, fusiform, penultimate whorl widest; sides flat. Whorl 6¾-7 1/8, convex. Suture impressed. Constriction level with the parietal side of the peristome, with 1 transversal parietalis; Columellaris inconspicuous, close to the peristome. Tuba ¾-7/8 whorl. Radial ribs straight, distinct, rather high, rather thin, rather widely spaced to rather densely placed, often densely placed towards the constriction (3-4 ribs/0.5 mm on the penultimate whorl). Spiral striation fine, inconspicuous. Umbilicus closed. Aperture hardly tilted with regard to the coiling axis; columellaris inconspicuous. Peristome double, expanding; palatal side not or hardly sinuous, with a (slight) edge; basal side with a slight edge; basal edge sinuous, protruding; outer peristome expanding beyond the inner or not; inner peristome with palatal lip, expanding but partly free on the columellar side, somewhat expanding on the parietal side.”
Diplommatina welzeni – “Height 2.6-3.0 mm; width 1.2-1.4 mm; index 2.0-2.3. Height and width aperture 0.5-0.6 mm.” (Vermeulen, 1993)
Type locality – “Borneo. Kalimantan Selatan; Nateh near Batu Tangga, approximately 18 km E of Barabai” (Vermeulen, 1993)
Other localities – “Borneo. Kalimantan Selatan; Jaro near Muara Uja, limestone escarpment W of the village” (Vermeulen, 1993); “Borneo. Kalimantan Selatan; Bt. Pagat, limestone hill 8 km SE of Barabai” (Vermeulen, 1993); “Borneo. Kalimantan Timur; Batu Butuk, near Muara Komang along main road Bandjarmasin-Balikpapan.” (Vermeulen, 1993); “Borneo. Kalimantan Timur; G. Melihat, foot of S facing slope. Between river and main road Bandjarmasin-Balikpapan.” (Vermeulen, 1993);