Ibycus rachelae Schilthuizen & Liew, 2008
“We place this species in the genus Ibycus for its long, laterally compressed tail and the arrangement of the shell lobes. It may be identical to the species described by Laidlaw (1937 as Ibycus sp. From Kinabalu, although the genitalia as figured by Laidlaw do not seem to correspond perfectly with those in our material. In Laidlaw’s darwing, the dart sac is longer than the penis, wheres it is shorter in our material, and Laidlaw shows the receptaculum as a separate organ at the basis of the vagina, whereas it appears to be a blind sac of the vagina in our specimens.” (Schiltuizen & Liew, 2008)
“The living animal has the habit of wrapping its long tail around the body when in rest.” (Schiltuizen & Liew, 2008)
Schilthuizen & Liew (2008) original descriptions on Ibycus rachelae – “Semislug. Shell: yellowish brown (protoconch whitish), globose, almost hemispherical, 1.5 whorls. Body yellowish green, with dorsal line of the tail yellow. Head (usually hidden under the dorsum) light or dark grey. In preserved specimens, the green and yellow coloration is lost and the animals look entirely white. Tail long, three time as long as the head. Shell lobes and posterior part of the body covered in small, densely arranged tubercles, which are circular and of varying size on the shell lobes. Tail covered by regularly arranged, diamond-shaped rugae. Left shell lobe small, right shell lobe very large and wing-like. Penis straight, regular in girth, terminally bent beack upon itself, where the vas deferens joins it laterally. Two dilations are visible in the vas deferens where it attached to the penis. Dart-sac club-shaped, slightly shorter than the penis but of equal girth. Vagina short, almost immediately giving way to the receptaculum.”
Ibycus rachelae – “Body length: up to 40 mm.” (Schiltuizen & Liew, 2008)
Type locality – “Sabah; Mount Kinabalu, 1500 m alt” (Schilthuizen & Liew, 2008)
Other localities – “Sabah; Crocker Range (Kimanis), 1400 m alt” (Schilthuizen & Liew, 2008); “Sabah; Crocker Range (Gunung Mas)” (Schilthuizen & Liew, 2008); “Sabah; Mount Trus Madi, 1400 m” (Schilthuizen & Liew, 2008) “Sabah; Mount Kinabalu, 1200-1900 alt” (Schilthuizen & Liew, 2008); “Sabah; Mount Tambuyukon, 1600 m alt” (Schilthuizen & Liew, 2008)
“In primary montane forest from 1200 to 1900 m alt., on leaves.” (Schiltuizen & Liew, 2008)