Chamalycaeus (?) armillatus (Benson, 1856)

Pall-Gergely, Barna, Sajan, Sheikh, Tripathy, Basudev, Meng, Kaibaryer, Asami, Takahiro & Ablett, Jonathan D., 2020, Genus-level revision of the Alycaeidae (Gastropoda, Cyclophoroidea), with an annotated species catalogue, ZooKeys 981, pp. 1-220 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.981.53583
publication LSID	lsid:zoobank.org:pub:5194AAC8-6B8A-473F-8A41-470A60182A0B
persistent identifier	https://treatment.plazi.org/id/8F791FD6-A80D-53C1-8E27-3EDF3A867692
treatment provided by	ZooKeys by Pensoft (2020-10-29 22:48:38, last updated 2024-11-25 21:42:09)
scientific name	Chamalycaeus (?) armillatus (Benson, 1856)
status

Treatment

Alycaeus armillatus Benson, 1856: 227.

Alycaeus armillatus - Reeve 1878: pl. 5, species 38; Godwin-Austen 1914: 406, pl. 151, figs 3, 3a.

Alycaeus (Dicharax) armillatus - Kobelt 1902: 365; Gude 1921: 236-237.

Type locality.

"ad Thyet-Mio cum præcedente (= A. sculptilis)".

Material examined.

UMZC 102995 (holotype [single specimen mentioned in the original description]).

Remarks.

Protoconch low, no spiral striation visible.

The specimen largely matches Benson’s original description, and therefore we consider it to be the holotype. The photographs of that specimen show some signs of spiral striation. However, those striae may be part of the lower shell layers, and not raised threads as in other Chamalycaeus species. Consequently, the spiral striae on the holotype of A. armillatus may not be homologous with the ones in Chamalycaeus species; we would need fresh shells to confirm this. For the time being, we refer to this species as Chamalycaeus (?) armillatus .

The shells labelled as A. armillatus in the NHM (Thayet-myo, Pegu, coll. Blanford, NHMUK 1906.4.4.71, 6 shells) belong to another (probably undescribed) Chamalycaeus species based on the shorter R3, the shallower constriction between R2 and R3, and the smaller distance between the inner and outer peristomes.

References

Gude, GK, 1921. The Fauna of British India including Ceylon and Burma. Mollusca. III. Land operculates (Cyclophoridae, Truncatellidae, Assimineidae, Helicinidae). Taylor and Francis, London, DOI: https://doi.org/10.5962/bhl.title.12890

Kobelt, W, 1902. Das Tierreich. Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen. In Verbindung mit der Deutschen Zoologischen Gesellschaft herausgegeben von der Koeniglich Preussischen Akademie der Wissenschaften zu Berlin. Mollusca: Cyclophoridae. R. Friedlaender und Sohn, Berlin, https://biodiversitylibrary.org/page/1000211

Reeve, LA, 1878. Monograph of the genus Alycaeus. In: Reeve LA (Ed.) Conchologica Iconica: or, Illustrations of the Shells of Molluscous Animals. Reeve and Co., London, 20: 13 pp. [+ 6 pls] https://www.biodiversitylibrary.org/page/8230573