Metalycaeus nipponensis (Reinhardt, 1877)

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/DBAF3D82-E6E1-599E-B088-F873F51AD93A
treatment provided by	ZooKeys by Pensoft (2020-10-29 22:48:38, last updated 2024-11-25 21:42:09)
scientific name	Metalycaeus nipponensis (Reinhardt, 1877)
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Metalycaeus nipponensis (Reinhardt, 1877) Fig. 31A View Figure 31

Alycaeus Nipponensis Reinhardt, 1877: 68.

Alycaeus nipponensis - Pilsbry 1900: 381.

Alycaeus melanopoma Pilsbry, 1900: 382.

Alycaeus (Chamalycaeus) nipponensis - Kobelt 1902: 360.

Alycaeus (Metalycaeus) melanopoma - Kobelt 1902: 378.

Chamalycaeus (Chamalycaeus) nipponensis - Zilch 1957: 144, pl. 5, fig. 16.

Chamalycaeus nipponensis - Azuma 1982: 11, pl. 4, fig. 35; Minato 1988: 13.

Chamalycaeus (Metalycaeus) nipponensis - Egorov 2013: 37, figs 67a, b.

Metalycaeus nipponensis - Páll-Gergely et al. 2017: 73, figs 46A-C; Páll-Gergely and Asami 2017: 4.

Type locality.

“Kioto”.

Material examined.

Hakone Mts, Japan, leg. Schmacker, ANSP 78815 (lectotype of A. melanopoma , designated by Baker 1964, photographs examined); Japan, Yedo, Doenitz l., coll. Reinhardt, SMF 185407 (labelled as ‘typus’); 東京都 (Tōkyō-to), 多摩市 (Tama-shi), 蓮光寺聖跡記念館境内 (Renkō-ji Seiseki Kinenkan keidai) [Tama City, Tokyo Metropolitan Prefecture], NSMT-Mo 79102 (91 shells).

Remarks.

Protoconch elevated, its last 0.5 whorl with spiral lines; ribbing on R2 is quite variable; there are 14-22, usually elevated and distinct ribs. In some specimens the ribs are relatively irregular, and they seemingly join to each other near the tube. This is, however, rather due to the fact that the shells are weathered (despite the fact that they were collected alive), because the elevated ribs are destroyed and appear lower. R1 with clearly visible, fine spiral striation.

In the examined sample, 91 specimens had an operculum, and of those 53 of them had the outer black circle present. In case of 27 specimens the outer circle was entirely missing, and in 11 cases only small fragments of the rings remained.

References

Azuma, M, 1982. Colored Illustrations of the Land Snails of Japan. Hoikusha, Osaka, [xv +] 333 pp. [pls 1-64]

Baker, B, 1964. Type land snails in the Academy of Natural Sciences of Philadelphia Part III. Limnophile and Thalassophile Pulmonata Part IV. land and fresh-water Prosobranchia. Proceedings of the Academy of Natural Sciences of Philadelphia 116: 149 - 193

Egorov, RV, 2013. Treasure of Russian Shells. Supplement 3. A review of the genera of the terrestrial pectinibranch molluscs (synopsis mainly based on published data). Part III. Littoriniformes: Liareidae, Pupinidae, Diplommatinidae, Alycaeidae, Cochlostomidae. R. Egorov, Moscow

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

Minato, H, 1988. A systematic and bibliographic list of the Japanese land snails. H. Minato, Shirahama X

Pall-Gergely, B, Hunyadi, A, Đỗ, ĐS, Naggs, F, Asami, T, 2017. Revision of the Alycaeidae of China, Laos and Vietnam (Gastropoda: Cyclophoroidea) I: The genera Dicharax and Metalycaeus. Zootaxa 4331 (1): 1 - 124, DOI: https://doi.org/10.11646/zootaxa.4331.1.1

Pall-Gergely, B, Asami, T, 2017. A new species of Metalycaeus hitherto undistinguished from M. vinctus (Pilsbry, 1902). Venus 75 (1-4): 1 - 16

Pilsbry, HA, 1900. Notices of new Japanese land shells. Proceedings of the Academy of Natural Sciences of Philadelphia, 52: 381 - 384, https://www.biodiversitylibrary.org/page/24694261

Zilch, A, 1957. Die Typen und Typoide des Natur-Museums Senckenberg, 20: Mollusca, Cyclophoridae, Alycaeinae. Archiv fuer Molluskenkunde 86(4/6): 141-150.

Figures

Figure 31. Type species of alycaeid genus-group taxa A Alycaeus melanopoma Pilsbry, 1900 (synonym of Chamalycaeus nipponensis (Reinhardt, 1877 )), lectotype (ANSP 78815; type species of Metalycaeus); B Metalycaeus magnificus (Godwin-Austen, 1914), syntype (NHMUK 1903.7.1.3115; type species of Raptomphalus). Photographs: downloaded from the website of ANSP (A), Harold Taylor (B).