Diplommatina isseli Godwin Austen, 1889
“The single entire Sabah specimen available is shorter, and has about a whorl less, than the syntypes from Sarawak. Otherwise it is not different.” (Vermeulen, 1993)
Godwin-Austen (1889) original descriptions on Diplommatina isseli – “Shell sinistral, elongately fusiform, slightly rimate; sculpture very fine spiral liration, crossed by well-defined regular somewhat close costulation; colour sienna-brown; spire high, tapering rapidly; apex fine; suture well impressed; whorls 8, sides convex, the last the largest, not ascending, constriction on side ½ a whorl behind aperture, where position of operculum may be seen; aperture very oblique, oval; peristome double, not thickened, reflected slightly, with a thin callous on the last whorl; columellar margin with a blunt rounded tooth.”
Kobelt (1902) descriptions on Diplommatina (Pseudopalaina) isseli – “Schale linksgewunden, leicht geritzt, lang spindelförmig, durch Rippen und Spiralreifen gegittert, braun; Gewinde hoch, spitz, Apex fein; Naht eingedrückt; 8 gewölbte Windungen, letzte grösser, nicht ansteigend, in der Mitte eingeschnürt; Mündung sehr schräg, eiförmig; Mundrand doppelt, nicht verdickt, leicht umgeschlagen, mit dünnem Callus; Spindelrand mit einem stumpfen, abgerundeten Zahn.”
Vermeulen (1993) descriptions on Diplommatina isseli – “Shell sinistral, strictly conical, sides flat. Whorls 6 7/8-8 1/4, convex. Suture impressed. Constriction level with the columellar side of the peristome, with 1 very short oblique parietalis close to the suture, 1 transversal palatalis, 1 columellaris. Tuba 5/8 whorl. Radial ribs not sinuous, distinct, rather low, rather thin, densely placed (4-5 ribs/0.5 mm on the penultimate whorl). Spiral striation present or not. Umbilicus open, narrow. Aperture tilted about 45° with regard to the coiling axis; columellaris distinct, not directed downwards. Peristome simple or double, moderately expanding; palatal side not sinuous, without edge; basal side without edge; basal edge not sinuous, rounded; outer peristome hardly expanding beyond the inner; inner peristome without palatal lip, expanding but free on the columellar side, little expanding on the parietal side.”
Diplommatina isseli – “Size: maj. diam. 2.9 mm; alt. axis 4.0 mm.” (Godwin-Austen, 1889); Diplommatina isseli – “Height 4-5.1 mm; width 2.2-2.5 mm; index 1.9-2.1. Height and width aperture 0.9-1 mm.” (Vermeulen, 1993)
Type locality – “Sarawak Proper and Busan Hill” leg. A. Everett (Godwin-Austen, 1889)
Other locality – “Borneo. Sabah. Interior Zone: Batu Urun near Sepulot, from soil deposited at Tenom Agricultural Station.” (Vermeulen, 1993)