Opisthostoma javanicum van Benthem Jutting, 1932
“The species is related to O. perakensis Godwin-Austen & Nevill and to O. paulucciae Crosse & Nevill, but cannot be assimilated with either of the two.” (Benthem-Jutting, 1932). “Rather similar to O. ballorum.” (Vermeulen, 1991)
“Recently, populations of O. javanicum have been found in SE. Kalimantan containing specimens with a lower spire and a wider umbilicus than the type. They occur together with specimens similar to the type, as well as with numerous morphological intermediates, They are not different from O. aetheroscopa, from Gomantong, Sabah. As a consequence, O. aetheroscopa and musl be regarded as a synonym of O. javanicum. O. ballorum differs in usually having the peristome attached to both the widest whorl of the spire and the whorl above the widest. In case the peristome does not touch the whorl above the widest, only a very narrow gap is present between them is most cases. In O. javanicum this gap is usually much wider. Populations of O. brachyacrum brachyacrum from the 4th. Division of Sarawak show a variability similar to that of O. javanicum, Particularly specimens with low spire and/or a wide umbilicus may resemble similar forms of O. javanicum.” (Vermeulen, 1994)
Benthem-Jutting (1932) original descriptions on Opisthostoma (Opisthostoma) javanica – “Shell dextral, irregularly cylindrical with the last whorl fist ascending and then turning backwards about half a turn. Uniformly pink or white, opaque. Top projecting, but blunt. Apical whorl and part of second one smooth, the others ornamented with relatively strong, oblique costulations, regualarly distributed with other in the beginning, becoming more distant as growth proceeds. Whorls 4½, convex, apical whorl and first part of second one placed with a slight excentric deflection on the axis of the following whorls. In some specimens even the third one in its turn makes again a faint angle with the fouth. Whorls 1 and 2 slightly but distinctly exserted, thus being visible in a side view of the shell. Penultimate whorl in most cases a little larger than the following one. Last whorl slightly constricted at the commencement of the deviation in coiling. Suture deep. Aperture trumpetshaped, subangularly circular, turned backward, lying in a vertical plane or nearly so. Peristome continuous, double, the final rim broad and a little dilated, especially towards the side of the shell. Here it is fixed to the third whorl. Umbilicus subcircular to oval, not concealed by the last whorl. Operculum unknown.”
Benthem-Jutting (1951) descriptions on syntype Opisthostoma (Opisthostoma) aspastum – “Shell short-cylindrical, papaeform. White or blonde. First whorl smooth, following ones ornated with fine, white, transverse costae, from the beginning distantly placed, like in O. (O.) javanicum v. B. Jutting. Between the ribs there are fine spiral striae. Not or a little shining; not or a little transparent. Whorls 4-4½, convex. First two placed somewhat obliquely on the axis of the shell. Spire distinctly elevated, all whorls being visible in side view. Penultimate whorl largest, somewhat bulging out in the side view. Penultimate whorl largest, somewhat bulging out in the shell profile. Suture deep. Umbilicus open, but not wide. Last whorl slightly constricted transversely in the middle, then widening again, ascending and twisted, so that the aperture faces backward, falsely representing a sinistral shell. Aperture round, placed vertical, adnate. Peristome continuous, circular, or rounded-triangular, duplex. Reaching as high as the upper part of the penultimate whorl, or even to the suture between second and third whorls. Operculum unknown.”
Vermeulen (1991) descriptions on Opisthostoma javanicum – “Shell white, slightly translucent. Whorls approximately 3½ (tuba not included); to whorls slightly oblique, moderately to distinctly elevated; body whorls forming a cylindrical body which may often be slightly oblique, convex, well rounded or somewhat angular, with the suture well impressed. Constriction rather distinct, gradual. Tuba consisting of approximately ½ whorl, touching the body whorls over its entire length, approximately circular in section. Shell with rather wide, distinct radial ribs, which are widely spaced near the top, slightly more densely placed and rather low on the upper body whorl (17-45 ribs present on this whorl), somewhat wider spaced again on the lower body whorl and particularly over the area of the constriction, and moderately spaced and more prominent on the tuba. Ribs crossed by fine spiral striation. Umbilicus open, deep, narrow. Aperture with the imaginary plane through the inner peristome tilted up to 45 degrees with regard to the coiling axis of the body whorls; with the upper margin not protruding beyond the plane perpendicular to the coiling axis of the boy whorls as well as through the apex; widely ovate to circular; apertural teeth absent; inner peristome moderately thickened, moderately reflected; outer peristome moderately to distinctly flaring on the palatal side. Constriction inside with two teeth; one rather distinct, oblique infracolumellaris; one tranverse palatalis.
By Vermeulen (1991)
"shell white, approximately opaque, whorls 3 1/8 - 3 1/2 (tuba not included); top whorls somewhat oblique, moderately elevated; body whorls forming a cylindrical body, convex, well rounded, sometimes slightly angular, with the suture well impressed. Constriction rather distinct, gradual. Tuba consisting of approximately 1/2 whorl or somewhat less, touching the body whorls over its entire length, approximately circular in section. Shell with ratehr thin radial ribs, which are widely spaced near the top, moderately spaced and low on the upper body whorl (24-28 ribs present on this whorl_, slightly more prominent and somewhat wider spaced on the lower body whorl and over the area of the constriction, and moderately spaced and rather high on the tuba. Ribs crossed by fine spiral striation. umbilicus open, deep, wide. Aperture with the imaginary plane through the inner peristome tilted 60-90 degrees with regard to the coiling axis of the body whorls; with the upper margin not protruding beyond the plane perpendicular to the coiling axis of the body whorls as well as through the apex; widely ovate; apertural teeth absent; inner peristome somewhat thickened, slightly reflected; outer peristome distinctly flaring on the palatal side. Constriction inside with two teeth: one rather inconspicuous, slightly oblique, rather low infracolumellaris which projects over the lower palatal wall, at some distance and approximately parallel to the palatalis, one rather inconspicuous, transverse, long, low palatalis. Measurements.-Height of body whorls 0.7-0.9 mm; width including tuba 1.2-1.3 mm, without tuba 0.8-0.9 mm; height of aperture 0.5 mm; width of aperture 0.5 mm."
Opisthostoma (Opisthostoma) javanica – “Dimensions: Diam. maj. 1.3 mm. min. 0.8 mm. Alt. 0.9 mm. Diam apert. 0.5 mm.” (Benthem-Jutting, 1932); syntype Opisthostoma (Opisthostoma) aspastum – “Dimensions; Height – 0.9-1.1 mm; Breadth – 1.2-1.4 mm; Diam. of aperture – 0.4-0.6 mm.” (Benthem-Jutting, 1951); Opisthostoma javanica – “Height of body whorls 0.8-1.1 mm; width including tuba 1.0-1.5 mm, without tuba 0.7-1.0 mm; height of aperture 0.4-0.6 mm; width of aperture 0.4-0.6 mm.” (Vermeulen, 1991)
Type locality – “Goenoeng Tjibodas (Estate of Tjampea) near Buitenzorg, Java 300 m. alt.” leg. T. Benthem-Jutting/1930-31 (Benthem-Jutting, 1932); syntype Opisthostoma (Opisthostoma) aspatum “Limestone hills of Pangkadjene, near Makassar, South Celebes, sea level” leg. G. A. Tammes & Bolt/May 9, 1948 (Benthem-Jutting, 1951); syntype O. oetheroscopa “Sabah; Sandakan zone, Bt. Gomantong, 30 km S. of Sandakan” (Vermeulen, 1991)
Other localities – “Pass in limestone mountains between Udjung Lamuru and Watampone, 140-141 km from Makassar, South Celebes, 300-400 alt.” leg. G. A. Tammes & Bolt/Sep. 28, 1948 (Benthem-Jutting, 1951); “Celebes; Maros Mts., Bantimurung” leg. Prud’homme van Reine (Vermeulen, 1991); “Madura” leg. Whitten (Vermeulen, 1991); “Kalimatan Selatan, Meratus Mts., approximately 35 km NE of Martapura” leg. Lamb & Mackinnon (Vermeulen, 1991); “Kalimantan Timur, 30 km W of Balikpapan” leg. Van Balgooij (Vermuelen, 1991); “Kalimantan Selatan, Batu Apoh, approximately 35 km NE. Of Martapura” leg. Lamb & Mackinnon (Vermeulen, 1994); Kalimantan Selatan, Telaga Langsat, approximately 18 km SSW. Of Barabai” leg. Vermuelen (Vermeulen, 1994); “Kalimantan Selatan, Bt. Pagat, limestone hill 8 km SE of Barabai” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, Nateh near Batu Tangga, approximately 18 km E. of Barabai” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, “G. Siamang near Desah Liu, 30 km E. of Tandjung” leg. Vermeulen; “Kalimantan Selatan, G. Buleh, 4 km E. Of Muara Uja” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, Jaro near Muara Uja, limestone escarpment W. Of the village” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, G. Halat, near border Kalimantan Timur along main road Banjarmasin-Balikpapan” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, Batu Tungga, near Sarungga, W. Of road Batulicin-Benualawas” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, limestone escarpment W. of km 6 road Benualawas-Batulicin” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Selatan, limestone escarpments along road Benualawas-Limbungan” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Timur, Batu Butuk, near Muara Komang along main road Bandjarmasin-Balikpapan” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Timur, G. Melihat, foot of S-facing slope, between river and main road Banjarmasin-Balikpapan” leg. Vermeulen (Vermeulen, 1994); “Kalimantan Timur, 30 km W. Of Balikpapan” leg. Van Balgooij (Vermeulen, 1994); “Sarawak, 4th Div., limestone quarry 2 km N. of Kpg. Satap, NW. of Bekenu” leg. Raven (Vermeulen, 1996).