Taxon profile
species
Plectostoma concinnum (Fulton, 1901)
kingdom Animalia - animals » phylum Mollusca - mollusks » class Gastropoda - gastropods » order Architaenioglossa » family Diplommatinidae » genus Plectostoma
ID: 1652709
pID: 1628451
Taxonomic rank: 150
Author of the record: Delsing Jan
Created: 2021-06-07 12:38:18 - User Delsing Jan
Last change: 2022-11-06 15:56:59 - User Václav Hanzlík
Data last updated: 2021-06-07 12:38:20
URL: https://www.biolib.cz/en/taxon/id1652709/
Text function: [[t:1652709;<em>Plectostoma concinnum</em>]]
[[t:1652709;<em>Plectostoma concinnum</em>]] (Fulton, 1901)
Reference: <a href="https://www.biolib.cz/en/taxon/id1652709/"><em>Plectostoma concinnum</em></a>
pID: 1628451
Taxonomic rank: 150
Author of the record: Delsing Jan
Created: 2021-06-07 12:38:18 - User Delsing Jan
Last change: 2022-11-06 15:56:59 - User Václav Hanzlík
Data last updated: 2021-06-07 12:38:20
URL: https://www.biolib.cz/en/taxon/id1652709/
Text function: [[t:1652709;<em>Plectostoma concinnum</em>]]
[[t:1652709;<em>Plectostoma concinnum</em>]] (Fulton, 1901)
Reference: <a href="https://www.biolib.cz/en/taxon/id1652709/"><em>Plectostoma concinnum</em></a>
Data source: Molluscabase.
Images
Author: Vermeulen, J.J.
Author: Vermeulen, J.J.
Description
Author: Jan Delsing
Text ID: 109591
Text Type: 1
Page: 0
Created: 2021-06-07 12:39:43 - User Delsing Jan
Language: EN
Text function: [[t:1652709,textblock=109591,elang=EN;Description]]
Text ID: 109591
Text Type: 1
Page: 0
Created: 2021-06-07 12:39:43 - User Delsing Jan
Language: EN
Text function: [[t:1652709,textblock=109591,elang=EN;Description]]
Material seen. — SABAH. Kudat Zone: Pulau Banggi (BMNH/1, see above; RMNH/>I0; UF 133022/3). Sandakan Zone: Batu Putih near road Lahad Datu-Sandakan, near Kinabatangan R. (V 1473/>10); Batu Laab near road Lahad Datu-Sandakan, near Kinabatangan R. (leg. Wilford, UF 194910/>10); Bt. Gomantong, 30 km S. of Sandakan (BMNH/5, see above; RMNH/2; UF 160187/2); limestone outcrop W. of Sg. Tabin, lower part, lower Segama Valley (leg. Wilford, UF 194821). Tawau Zone: G. Madai, 40 km SSW. of Lahad Datu (leg. Smits, M 14079/6; leg. Dorman, UF 196753/>10). "North Borneo" (UF 133005/2; UF 133006/2; UF 160199/9).
Spire conical with flat to concave sides. Apex not oblique. Whorls 5 1/2-6 3/8, moderately convex; last whorl (slightly) angular. Constriction with a parietalis, a longitudinal and a transverse palatalis, a columellaris, with or without a basalis that is knob-shaped or a transverse ridge. Tuba gradually narrowed towards the constriction, (slightly) angular or with a ridge below. Radial ribs on the spire rather closely placed to widely spaced (2-6 ribs/0.5 mm on the penultimate whorl), with a (shallowly) concave to deeply trough-shaped projection half-way, often abraded to a sinuous or shallowly to deeply looped scar (projection of those close to the tuba often double-channeled either with both channels equally deep or with the upper channel much deeper than the lower, abrading to a scar with either a single or a double, deep or shallow loop when the shell is observed in front view); those on the tuba moderately to widely spaced (2-3 ribs/0.5 mm half-way the tuba), below with a deeply trough-shaped, slightly curved projection abrading to a scar with a deep, semi-circular loop. Spiral striation fine. Umbilicus open, 0.30-0.40 mm across. Aperture tilted up to 30° with regard to the coiling axis, circular. Peristome double; outer peristome spreading beyond the inner but gradually narrowed towards, and absent to narrow along the right side of the aperture, often somewhat widened along the upper side; inner peristome hardly protruding from the outer, spreading. Spire; height 1,7-2.3 mm; width 1.3-1.5 mm; index 1.3-1.7. Total width 2.5-3.2 mm. Height and width aperture 0.6-0.7 mm.
Distribution. — Borneo: Sabah, E. part, and P. Banggi. On widely scattered localities.
Spire conical with flat to concave sides. Apex not oblique. Whorls 5 1/2-6 3/8, moderately convex; last whorl (slightly) angular. Constriction with a parietalis, a longitudinal and a transverse palatalis, a columellaris, with or without a basalis that is knob-shaped or a transverse ridge. Tuba gradually narrowed towards the constriction, (slightly) angular or with a ridge below. Radial ribs on the spire rather closely placed to widely spaced (2-6 ribs/0.5 mm on the penultimate whorl), with a (shallowly) concave to deeply trough-shaped projection half-way, often abraded to a sinuous or shallowly to deeply looped scar (projection of those close to the tuba often double-channeled either with both channels equally deep or with the upper channel much deeper than the lower, abrading to a scar with either a single or a double, deep or shallow loop when the shell is observed in front view); those on the tuba moderately to widely spaced (2-3 ribs/0.5 mm half-way the tuba), below with a deeply trough-shaped, slightly curved projection abrading to a scar with a deep, semi-circular loop. Spiral striation fine. Umbilicus open, 0.30-0.40 mm across. Aperture tilted up to 30° with regard to the coiling axis, circular. Peristome double; outer peristome spreading beyond the inner but gradually narrowed towards, and absent to narrow along the right side of the aperture, often somewhat widened along the upper side; inner peristome hardly protruding from the outer, spreading. Spire; height 1,7-2.3 mm; width 1.3-1.5 mm; index 1.3-1.7. Total width 2.5-3.2 mm. Height and width aperture 0.6-0.7 mm.
Distribution. — Borneo: Sabah, E. part, and P. Banggi. On widely scattered localities.
Vermeulen, J.J., 1994. Notes on the non-marine molluscs of the island of Borneo 6. The genus Opisthostoma (Gastropoda Prosobranchia: Diplommatinidae), part 2
Author: Jan Delsing