Amphidromus jacobsoni

Amphidromus jacobsoni
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Camaenidae
Genus:	Amphidromus
Species:	A. jacobsoni
Binomial name
Amphidromus jacobsoni Laidlaw, 1954
Synonyms
Amphidromus stevenabbasorumThach, 2021 junior subjective synonym Amphidromus sumatranus f. jacobsoniLaidlaw, 1954 superseded rank Amphidromus sumatranus jacobsoniLaidlaw, 1954 superseded rank

Amphidromus jacobsoni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Camaenidae. ^[1]

Description

The length of the shell attains 28 mm, its diameter 16.5 mm.

The whitish-brown coloration of the upper whorls transitions to a pale beige on the lower whorls. Beginning on the third whorl, a series of radial bars of darker beige appears, faintly interrupted at their midpoint and continuing to the posterior of the aperture on the body whorl. On the last two whorls, these bars tend to bifurcate from below, with a square spot of more intense color situated at the base of each fork. These spots form a spiral series around the periphery of the body whorl and, above the aperture, rest on a narrow, spiral band of dark beige that fades as it extends to the posterior of the shell. The umbilical area presents a beige hue. The underlying ground color is consistently bright yellow. ^[2]

Distribution

This species is found in Simeulue Island, Indonesia. ^[3]

References

1. Amphidromus jacobsoni Laidlaw, 1954 . 27 April 2025. Retrieved through: World Register of Marine Species .
2. Laidlaw, F.F. (1954). "Notes on species of the genus Amphidromus (Mollusca: Pulmonata: Pleurodontidae) from island laying off the west coast of Sumatra, with description of new races based on collections made by Dr E. Jacobson in 1913". Zoologische Mededelingen. 33: 80. This article incorporates text from this source, which is in the public domain .
3. "Amphidromus jacobsoni – Malacology-Asia.com" . Retrieved 2019-01-15.

• Thach, N. N. (2021). New shells of South Asia and Taiwan, China, Tanzania. Seashells*Freshwater*Land snails. With 116 new species and subspecies and rejected synonyms, accepted species. 48HRBooks Company, Akron, Ohio, USA. 202 pp.
• Wang, Y.-X. [Yong-Xing]. (2024). Descriptions of two new land snails of the genus Amphidromus Albers, 1850 (Gastropoda: Camaenidae) from Indonesia. Novapex. 25(1): 33-37.