Schistoloma sectilabrum (Gould, 1843)
“Penang specimens agree with those from Tavoy in having a smaller aperture and a slightly slenderer spire, with somewhat convex sides, while in M. anostoma from Borneo the spire is more regularly conical and the aperture larger.” (Stoloczka, 1872)
“The shells have a dark brown periostracum, but the color changes to a pale yellowish-orange after storage in 75% (v/v) ethyl alcohol (preservative).” (Panha & Tumpeesuwan, 2008)
“Operculum horny, circular, compound of several spiral layers arranged round a slightly thickened or mammillated centre so that the width of each lamina equals the radius of the whole operculum. This structure is somewhat peculiar, it agrees with that of the South Indian Cataulus recurvatus, but not with that of the other Catauli or Megalostoma exmined; in all those the operculum is distinctly multispiral.” (Stoliczka, 1872)
Shell pyramidal, raised, acuminated, very pale fulvous; whorls eight smooth, convex, sloped; last single-banded, very narrowly umbilicated; aperture rather ovate, margin duplicated, the outer part being interrupted at the body whorl, the inner part entire.
Kobelt (1902) descriptions on Schistoloma sectilabrum – “Schale eng genabelt, getürmt, ziemlich festwandig, fast glatt, braun; Gewinde hoch kegelförmig, Apex spitz; Naht mittelmässig tief, deutlich gerandet; 8 massig gewölbte Windungen, letzte wenig verschmälert, vorn nicht ansteigend, unten abgerundet; Mündung leicht eckig kreisrund, unten über die Spindel hinausreichend; Mundrand fast doppelt: innerer an der Naht eine leichte Rinne bildend, äusserer abstehend, links verbreitert.”
Fulton (1903) original descriptions on Coptocheilus perakensis – “Shell narrowly perforate, moderately solid, reddish-brown, spire elongately-conic, obliquely striated, last two whorls margined at the suture, whorls 7½, slightly convex, aperture circular, brown within; peristome sub-duplicate, expanded, whitish, margins connected by a raised callus, somewhat angular at upper columellar portion; operculum normal. C. perakensis differs from sectilabrum, Gld., in having no notch or sinus on its peristome, which is thinner, and also by its less convex whorls; from anostoma, Bens., it is distinguished by its smaller aperture, less convex whorls, and its more elongated form. The name Coptocheilus being said to be preoccupied, Kobelt has proposed the name of Schistoloma for this group.”
“Animal blackish grey with a slight reddish tinge; the edges of the foot, including the posterior end and the tentacles are vermilion, tips of rostrum pale grey. The length of the foot equals about three fourth of that of the shell when the animal moves about; the entire body is rather distinctly warty, but no well defined pedal row exists; the rostrum is adpressed to the foot, strongly wringkled and cleft at the end; posterior end of foot obtusely pointed, eyes small, the bulgings united at their bases to the tentacles. The mantle is pale, entire, closely attached to the peristome of the shells, and not protruding beyond it.” (Stoliczka, 1872)
“The animal has a black or dark brown colored head, and gradually changes to red-brown or orange-brown at the ventral and posterior part of foot. The tentacles are short and pointed, scarlet or bright orange, with dark brown coloration at the tip. Very small black eyes are located at the base of the lateral side of each tentacle. The difference in shell color between that reported here for S. sectilabrum and that from the original description may be caused by color variation within the species but the genetic (or perhaps environmental) basis for this remains unknown at present.” (Panha & Tumpeesuwan, 2008)
Schistoloma sectilabrum – “H. 24.5. Durchm. 10 mm.” (Kobelt, 1902); Coptocheilus perakensis – “Maj. diam. (including peristome) 11, long. 23 millim.” (Fulton, 1903)
Other localities – “Penang” (Stoliczka, 1872); “King island, Mergui” (Martens, 1889); “Perak” leg. Grubauer (Fulton, 1903); “Ulu Selama, Perak” (Sykes, 1903); “Kaeng Krachan National Park, Phetchaburi Province, Thailand” leg. T. Bundhitwongrut and C. Meesukkho (Panha & Tumpeesuwan, 2008)
“The species occurs at elevations from 400 to about 2400 feet on the Penang hill, but it is evidently a very scarce shell; I found only one live specimen at the top of the hill.” (Stoliczka, 1872)
Feeding habit – “Recent field observations revealed that S. sectilabrum is a decayed log dweller and that it probably feeds on decayed wood or fungi.” (Panha & Tumpeesuwan, 2008)