Sinoennea lepida van Benthem Jutting, 1961
- Dataset
- Malay Peninsular Terrestrial Molluscs
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- family
- Streptaxidae
- genus
- Sinoennea
- species
- Sinoennea lepida
morphology
Sykes (1902) original descriptions on Streptaxis collingei – “Shell openly umbilicated, well depressed, costulated, the costae being fine and regular, hyaline or yellowish white; whorls, 6 ½-7, somewhat convex, suture well marked, the last whorl being considerably distorted. Aperture oblique, sub0quadrate, peristome expanded and reflected; parietal lamella oblique and curved, palatal teeth generally four, sometimes only three, the uppermost and lowest being the largest.”
morphology
Benthem-Jutting (1954) original descriptions on Discartemon hypocrites – “Shell almost discoidal, with low spire, glassy white. First 2-2 ½ whorls smooth, following ones with fine, regular, close-set, somewhat wavy transverse ribs. On the upper part of each whorl the ribs are better developed than on the basal side. On the last whorl, close to the peristome, there are about 8-9 ribs to the mm. No spiral striation. Fresh shells shing and transparent. Whorls about 5, convex. Those of the spire normally coiled and regularly increasing in size. Last whorl somewhat irregular, at one time compressed, at another expanded. This irregularity is more evident in the paratypes than in the holotype. The terminal part of the ultimate whorl descends towards the aperture. Behind the peristome this last part is somewhat inflated, then pinched. Suture distinct, periphery rounded. Top little elevated, although somewhat more than in D. leptoglyphus. Base broad and little convex, but not quite flat. Umbilicus wide, although not so wide as in D. leptoglyphus, showing all previous whorls. On the umbilical side the last whorl is bluntly angulate. Aperture trigonal or arrow-shaped. Very oblique. Peristome not continuous, thickened and reflected. Upper lip expanded and projecting, inflected in the middle so as to form a distinct tooth. This tooth corresponds with a small groove on the exterior of the last whorl behind the peristome. At the upper parietal corner the upper margin of the aperture forms a sinuous ridge joining the parietal lamella. Lower lip receding, with 3-4 knob-like teeth. Parietal side with an almost horizontal sinuous lamella, entering 2-3 mm into the aperture.”
morphology
Benthem-Jutting (1954) original descriptions on Discartemon leptoglyphus – “Shell almost discoidal, with very low spire, creamy white. First 2-2 ½ whorls smooth, following ones with fine, regular, close-set, somewhat wavy transverse ribs on both upper and lower side of the shell. On the last whorl, near the peristome, there are about 8-9 ribs to the mm. No spiral striation. Fresh shells shining and glassy transparent. Whorls 5-5 ½, well rounded. The first 4-4 ½ normally coiled and regularly increasing in diameter, the last whorl somewhat inflated and expanded, partly overlapping the preceding one on the dorsal side. Towards the aperture the last whorl first ascends, then descends. Suture distinct. Periphery bluntly angulate; in full-grown shells the angulation disappears in the last whorl, so that the periphery is rounded. Top very little projecting, base broad and little convex, but not quite flat. Umbilicus very wide, showing all previous whorls. On the umbilical side the last whorl is bluntly angular. Aperture trigonal or arrow-shaped, very oblique. Peristome not continuous, thickened and reflected, towards the outer corner somewhat rising like an upturned nose. Upper lip expanded and projecting, inflected in the middle so as to form a low, indistinct, tooth-like protuberance. At the upper parietal corner the upper margin forms a sinuous ridge, joining the parietal lamella. Lower lip receding, parallel to the upper one. Parietal side with an almost horizontally placed lamella, entering into the aperture 2-3 mm.”
morphology
Benthem-Jutting (1954) original descriptions on Discartemon platyorphus – “Shell almost discoidal, with very low spire, although not quite so low as in D. leptoglyphus. Glassy white. First 2 ½ whorls smooth, subsequent ones with fine, regular, close-set, somewhat wavy transverse ribs. On the last whorl, near the peristome, there are about 8-9 ribs to the mm. On the upper side of each whorl the ribs are batter developed than on the basal part. No spiral striation. Fresh shells shining and transparent. Whorls 6, convex. All normally coiled and regularly increasing in size. The terminal part of the ultimate whorl descends to the aperture. This part is also somewhat widened, but not quite so expanded as in D. leptoglyphus. Suture distinct, periphery rounded, Top little elevated, somewhat more than in D. leptoglyphus. Base broad and little convex (but not quite flat). Umbilicus rather wide, although not so wide as in D. leptoglyphus, showing all previous whorls. On the umbilical side the last whorl is bluntly angulate. Aperture trigonal or arrow-shaped. Very oblique. Peristome not continuous, thickened and reflected. Upper lip expanded and projecting, inflated in the middle, so as to form a distict tooth. Lower lip receding, toothless, but with a hardly palpable callosity in the middle. Parietal side with an almost horizontal sinuous lamella, entering 2-3 mm within the aperture. At the upper parietal corner the upper lip forms a sinuous ridge, joining the parietal lamella.”
morphology
Benthem-Jutting (1961) original descriptions on Sinoennea lepida – “Shell cylindrical with low top and little attenuated base. Glassy white, transparent, ribbed with numerous tranverse ribs which are generally obsolete on the curve of the whorl and only visible at the suture. There are about 22-24 ribs on the last whorl; towards the aperture they are placed close together, on the rest of the shell surface the intervals are wider. No nspiral striation. Whorls 7-7 ½, the two whorls smooth, the following ones ribbed. Top whorls rounded, the following ones somewhat flattened. Suture distinct. Base rounded. Umbilicus narrow. Aperture vertical, the lower part a little receding. Quadrangular-oval with rounded angles. Peristome adnate to previous whorl, thickened and reflected. In the parieto-angular corner with a strong, undulating lamella. Columellar lamella well developed and deeply seated. On the outer margin the peristome bears two palatal teeth of about equal strength. The upper one lies at the peristome edge, the lower one deeper down. On the exterior of the shell, just behind the peristome there is a shallow longitudinal groove. Between this groove and the peristome the distal part of the last whorl is inflated.”
diagnostic
“A well-depressed shell, which, in the form and position of the teeth, recalls S. siamenesis, Pfr.” (Sykes, 1902)
“Among the shells from Batu Tongkat there are a few specimens of unusually small size (the smallest shell is high 4.70 and wide 7.25 mm). The largest shell in the collection, from Gua Nenek, is high 6.20 and wide 9.90 mm. In the original description Sykes mentioned the altitude as 5 mm. and the maximal diameter as 9 mm. The small shells referred to above do not show any other differences and I think there is no need to separate them under an infraspecific name. D. collingei has been found at localities in Kelantan and also at Gua Sai, a wholly separate limestone hill 45 miles to the south in the State of Pahang. This distribution forms a conspicuous exception among those of the other Malayan discoid and helicoids Streptaxids, and an explanation of it is suggested in the introduction to this paper.” (Benthem-Jutting, 1954)
diagnostic
“Compared with the other species of Discartemon of Malaya D. hypocrites is distinguished by the following features: It has a higher spire and a narrower umbilicus than either D. leptoglyphus or D. platymorphus and an aperture provided with more teeth. Compared with D. sykesi it has a higher spire an better developed costulation. Besides the mouth armament is more elaborate. The new species is smaller than D. nummus an has a more developed costulation. There is no peripheral carina. The spire of D. hypocrites is lower than in D. collingei, D. plussensis, D. roebeleni and D. stenostomus, and the umbilicus is wider than in any of these.” (Benthem-Jutting, 1954)
diagnostic
“Compared with D. hypocrites it has a wider umbilicus, a wider and more expanded last whorl, which is not pinched. Aperture with only one tooth (instead of 3-4 as in D. hypocrites) on the peristome. Compared with D. platymorphus it differs in the smaller size, and the somewhat upturned outer corner of the peristome. The tooth in the aperture is less distinct than in D. platymorphus. Compared with D. nummus it differs in the absence of a peripheral keel, and in the presence of tranverse costulation on both upper and lower side of the shell. The upper margin of the peristome is less deflected and protruding than in D. nummus. Compared with D. sykesi it differs in the smaller size, the well developed transverse striae above and below, and the less deflected and protruding upper peristomal margin.” (Benthem-Jutting, 1954)
diagnostic
“Compared with the other species of Discartemon of Malaya D. platymorphus is characterised as follows: The spire is lower than in Discartemon collingei, D. plussensis, D. roebeleni and D. stenostomus, and the umbilicus is wider than in any of these. From D. hypocrites it differs in the mouth armature, the greater size and the flatter spire. It has a higher spire and a narrower umbilicus than D. leptoglyphus. The last part of the ultimate whorl is not so wide and expanded as in D. leptoglyphus. From D. nummus it differs in not being angulate at the periphery and in lacking the reinforced callus at the junction of parietal lamella and sinus. Finally the upper margin of the peristome is not so deflected and protruded as in D. nummus. Discartemon sykesi is wider and flatter, with more open umbilicus.” (Benthem-Jutting, 1954)
diagnostic
“S. lepida is very similar to S. subcylindrica, but it is larger, with more whorls. The ribs on the last whorl are standing wider apart. The nature of the ribs is weaker, so that they often wear off on the great part of the shell, only visible along the suture. S. attenuata has also some likeness to S. lepida, but the latter is somewhat larger and possesses fewer ribs on the last whorl.” (Benthem-Jutting, 1961)
distribution
Type locality – “Malaya; Goa Siput, near Batu Lompat, Pahang” (Benthem-Jutting, 1961)
distribution
Type locality – “Kelantan, Malay Peninsula” leg. J. Waterstradt (Sykes, 1902)
Other localities – “Gua Sai, near Padang Tengku, Pahang” leg. H. Service/1947 (Benthem-Jutting, 1954); “Gua Nenek, Kelantan” leg. H. Service/1939 (Benthem-Jutting, 1954); “Batu Tongkat, between Gua Madu and Pulai, Kelantan” leg. H. Service/Aug. 1939 (Benthem-Jutting, 1954)
distribution
Type locality – “Bukit Chuping, Perlis, Malaya” leg. Benthem-Jutting/Apr. 1939 (Benthem-Jutting, 1954)
distribution
Type locality – “Kramat Pulai, Kinta Valley, Perak” leg. Benthem-Jutting/Mar. 1939 (Benthem-Jutting, 1954)
Other localities - “Gunong Rapat, Kinta Valley, near Ipoh, Perak” leg. Benthem-Jutting/Mar. 1937 (Benthem-Jutting, 1954); “Gunong Kroh, Kinta Valley, Simpang, Perak” leg. Benthem-Jutting/July 1946 (Benthem-Jutting, 1954)
distribution
Type locality – “Gua Nenek, Kelantan” leg. Benthem-Jutting/Jul. 1939 (Benthem-Jutting, 1954)
size
Streptaxis collingei – “Alt. 5; diam. max. 9 millim.” (Sykes, 1902)
size
Discartemon hypocrites – “Dimensions; Width 6.6-7.2, height 2.6-3.1, height of aperture 1.9-2.0 mm.” (Benthem-Jutting, 1954)
size
Discartemon leptoglyphus – “Dimensions; Width 6.1-8.7, height 2.4-3.1, height of aperture 1.8-2.2 mm.” (Benthem-Jutting, 1954)
size
Discartemon platyorphus – “Dimensions; Width 9.6-10.1, height 3.65-3.8, height of aperture 3 mm.” (Benthem-Jutting, 1954)
size
Sinoennea lepida – “Dimensions: Height 3.4-3.8 mm; Width 1.4-1.5 mm; Height of aperture 1.2-1.3 mm.” (Benthem-Jutting, 1961)