Amaea grossicingulata
(de Boury, 1913)
Description:
Dimensions range from 10.9 mm - 13 mm high and 6.5 mm wide.
Width to height ratio: 0.6:1 ~ 0.5:1
Shell: conical; small. Exterior colour white. About 6.5 whorls, convex; protoconch broken in holotype. Suture deep, open, not perforated. Umbilicate: narrow. Approximately 28 costae on the body whorl. Costae are slightly oblique, thread-like, sharp, barely projecting which sometimes transform into a thick, low varix. Occasional varix appearing randomly on the shell. Costae not peaked. Intercostal spaces thick, regular transverse cords. Interstices with approximately 12 spiral striae per whorl. Base convex, without basal cord, costae crossing the base into the umbilicus. Aperture oval-oblong; peristome double; outer lip interrupted posteriorly, moderately expanded; inner lip continuous, thin.
Distribution:
Amoy (China Seas)- most likely in the waters off Xiamen, China [Boury, 1913:183]
Habitat:
not reported [Brown & Neville, 2015:81]
Etymology:
[lating] from grossus = thick or coarse and cingulatum = belt, girdle or band, translating as thickly banded in reference to the shell's sculpture
Type Material:
Holotype: ZMB 280 for Amaea grossicingulata (de Boury, 1913) - Type Locality: Amoy [Xiamen, coastal Fujian Province], East China Sea.. [Brown, L. & Neville, B.D., 2015]
arsint.com (2023).
East China Sea
10.9mm
Distribution
as listed in source literature
Boury, E. de. (1913a).
Plate VIII. Fig. 9.
pp: 183.
shell white, with a narrow umbilical perforation, conical, ornamented with thread-like longitudinal ribs and fairly thick descending cords. The suture is slightly oblique, fairly deep, fairly open, and not perforated.
The protoconch is broken. There remain 6½ convex whorls, decorated with slightly oblique, thread-like, sharp, barely projecting longitudinal ribs, which sometimes transform into rather thick but very low varices. These ribs are not auriculate. They simply form a tiny expansion within the suture, where they are less exposed to wear. The intercostal spaces are adorned with thick, regularly arranged transverse cords, separated by gaps roughly equal in width to the cords themselves. About 12 cords can be counted on the penultimate whorl. The last whorl, which would be roughly equal in size to the rest of the spire if it were complete, is decorated with 28 ribs, including 2 varices. The base is convex and lacks any circumbasal cord. The ribs continue onto the base and sink into the extremely reduced umbilical perforation. The columella is not accompanied by a funicle. The aperture is oval-oblong. The peristome is double. The inner peristome is continuous, thin, and merges, in a way, with the outer peristome, which is poorly developed and interrupted at its posterior part. There is no trace of an auricle on the lip. The peristome slopes slightly toward the anterior part of the columella.
pp: 184.
arsint.com (2023).