Alycaeus gibbosulus is a species of small land snails with a gill and an operculum, terrestrial gastropod mollusks in the family Alycaeidae. [1]
| Alycaeus gibbosulus | |
|---|---|
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| Shell of Alycaeus gibbosulus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Architaenioglossa |
| Superfamily: | Cyclophoroidea |
| Family: | Alycaeidae |
| Genus: | Alycaeus |
| Species: | A. gibbosulus
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| Binomial name | |
| Alycaeus gibbosulus Stoliczka, 1872
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| Synonyms | |
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Description
editThe length of the shell attains 10 mm., its diameter 7 mm.
(Original description in Latin) The shell is turreted with a pronounced gibbosity and is narrowly umbilicated. It has a reddish-violet hue, with the body whorl becoming paler and yellowish, while the apex is whitish. The five whorls are highly convex and joined by a deep, simple suture. The first whorl is smooth, while the next three are densely covered with fine transverse ribs and spiral striations. The body whorl is inflated and more distinctly ribbed. Near the aperture, it is briefly but strongly constricted, slightly smooth, barely deflected, and fitted with a thin tube about two to three millimeters long, which is sometimes almost fully immersed.
The aperture is circular and moderately wide, surrounded by a simple, slightly expanded margin in young specimens, and bilabiate in adults. The inner lip extends outward, forming a tubiform, thickened structure, while the outer lip is dilated and thin. The operculum is solid, with a slightly convex, horny inner surface, submammillate at the center, and multi-spiral, featuring a transverse oval and eccentric muscular impression. The outer surface is calcareous, slightly concave, and irregularly wrinkled. [2]
Characteristics: The protoconch shows oblique striae. The broad central tooth of the radula contains five cusps with the central cusp blunt. This species is presumably closely related to Alycaeus conformis, due to the similarity in the protoconch sculpture.
The ovarium of the living specimen is wide with pointed anterior and blunt posterior end. The bursa copulatrix large, extends beyond ovarium posteriorly, opens at middle part of ovarium near its base, bursa has a thickened posterior portion. The seminal receptacle is small and oval. [3]
Distribution
editThis species occurs in Peninsular Malaysia.
References
edit- ^ Alycaeus gibbosulusStoliczka, 1872. 21 September 2024. Retrieved through: World Register of Marine Species.
- ^ Stoliczka, F. (1872). "On the land shells of Penang island, with descriptions of the animals and anatomical notes; part first, Cyclostomacea". The Journal of the Asiatic Society of Bengal, Part II. 41 (3): 268. Retrieved 21 September 2024.
This article incorporates text from this source, which is in the public domain.
- ^ Foon J.K. & Liew T.-S. (2017). "A review of the land snail genus Alycaeus (Gastropoda, Alycaeidae) in Peninsular Malaysia". Zookeys. 692: 1–81. This article incorporates text from this source, which is in the public domain.
External links
edit- de Morgan, J. (1885). "Note sur quelques espèces nouvelles de Mollusques terrestres recueillis dans la Péninsule malaise (mars-septembre 1884)". Le Naturaliste. 7 (9): 70.
- Páll-Gergely, B., Sajan, S., Tripathy, B., Meng, K., Asami, T. & Ablett, J.D. (2020). "Genus-level revision of the Alycaeidae (Gastropoda: Cyclophoroidea), with an annotated species catalog". Zookeys. 981: 29.
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