Opisthostoma paulucciae Crosse & Nevill, 1879
Crosse & Nevill (1879) original descriptions on Opisthostoma paulucciae – “T. irrégularitér subquadrato-ovata, longitudinaliter costulata, albida; spira vix turbinata, apice depresso, planato; sutura impressa; anfractus 3½ convexi, embryonales 1¼ depressi, planati, loeves, sequentes rotundati, ut embryonales dextrorsi, ultimus primo dextrorsus, mox constrictus, versus umbilici locum deflexus, in figuram litteroe S curvatus, denique sinistrorsum ascendens et anfractui penultimo appressus; apertura irregulariter trigono-rotundata, intus albida; peristoma continuum, subexpansum, breviter reflexum, albidum et lamella postica, circulari, marginem alterum simulante, munitum. Operculum?”
Crosse & Nevill (1879) French descriptions on Opisthostoma paulucciae – “Coquille de forme irrégulièrement subquadrangulaire-ovale et munie de costulations longitudinales bien marquées. Coloration uniformément blanchâtre. Spire faiblement turbinée, terminée par un sommet déprimé et aplati. Suture bien marquée. Tours de spire au nombre de 5½ et convexes; tours embryonnaires, au nombre de 1¼, lisses, polis, déprimés et aplatis; tours suivants arrondis; dernier tour d'abord dextre comme les précédents, puis présentant une constriction semblable à celle de certains Diplommatina, ensuite s'infléchissant, pour recouvrir en partie la région ombilicale, se recourbant en S et finissant par prendre une direction sénestre, en remontant jusqu'à la partie supérieure de l'avant-dernier tour, auquel il reste accolé, et qu'il dépasse même légèrement. Ouverture de forme irrégulièrement trigone-arrondie, et de coloration blanchâtre, à l'intérieur. Péristome continu, assez développé, brièvement réfléchi, blanchâtre, et présentant, un peu, en arrière, une lamelle circulaire, qui simule un deuxième bord. Opercule inconnu.”
Godwin-Austen & Nevill (1879) redescriptions on Opisthostoma paulucciae – “Shell dextral, very depressed, ovate, the last whorl reflected more than a half turn backwards and rising to the top of the antepenultimate whorl; colour ruddy brown ; the ribbing strong and wide on the last two whorls, very close and fine on those above. Spire depressed, sides parallel to axis, apex flat, suture moderately impressed. Whorls 4, penultimate and antepenultimate equal, their sides flat, the last whorl rounded and reversed. Aperture triangular, subvertical. Peristome double, both inner and outer lips.”
Godwin-Austen & Nevill (1879) descriptions on syntype Opisthostoma perakensis – “Shell dextral, much depressed, ovate, the last whorl reflected half a turn back and rising to a level with the penultimate suture; colour ruddy brown; sculpture fine ribbing, wide apart and regular to the apex. Spire depressed, sides parallel, apex flat, suture deep. Whorls 4, sides convex; penultimate and antepenultimate equal, the last reversed. Aperture circular, vertical; peristome double, inner lip circular, continuous; the outer lip angular below.”
Opisthostoma paulucciae – “Diam. maj. cum peristomate 1¼ mill; alt. 1.” (Crosse & Nevill, 1879)
Shell height – 0.3 in; Shell width – 0.33 in.
Type locality – “Buket Pondong, Perak” leg. E. Townsend (Crosse & Nevill, 1879); syntype Opisthostoma perakensis “Perak” (Godwin-Austen & Nevill, 1879)
Other localities – “Aceh Besar, westcoast, Pasi, 30 km S of Lhong” leg. Maassen/1997; “Aceh Tengah, Laot Tawar, 2.5 km E of Takemgon, at cave near hotel Rengali, south shore” leg. Maassen/1997; “Laot Tawar, 7 km NE of Takengon, north shore, 130 m higher than lake, rocks in bamboo forest along wall.” leg. Maassen/1997; “Laot Tawar, 11 km NE of Takengon, north shore” leg. Maassen/1997; “Laot Tawar, 7 km E of Takengon, south shore” leg. Maassen/1997; “N Sumatra, Bukit Lawang, SW of Medan, near the entrance of limestone “Bat-cave” leg. Maassen/1993; “Bukit lawang, numerous small caves in limestone, SE of village at border of rubber tree plantation” leg. Maassen/1993; “W. Sumatra, Bukittinggi, canyon near town at shady places” leg. Maassen/1996; “Baso, 14 km NW of Bukittinggi in direction Payakumbuh, evergreen limestone outcrop along road” leg. Maassen/1996; “near entrance of Cave Gua Pangian, 3 km N. of village Lintan, SE of Bukittinggi” leg. Maassen/1996; “Kampung Desa Gadut, limestone rocks near the village, E of Payakumbuh” leg. Maassen/1997; “W of Payakumbuh, overgrown limestone outcrop along road” leg. Maassen/1997; “at the entrance of a little cave near Situmbuk, 30 km E of Bukittinggi” leg. Maassen/1997; “Payakumbuh, near entrance of Cave Ngalan Indah” leg. Maassen/1995; “7 km W of Payakumbuh, overgrown limestone outcrop along road” leg. Maassen/1996 (Maassen, 2002)