Cyclophorus siamensis (Sowerby I, 1850)

Nantarat, Nattawadee, Sutcharit, Chirasak, Tongkerd, Piyoros, Ablett, Jonathan, Naggs, Fred & Panha, Somsak, 2014, An annotated catalogue of type specimens of the land snail genus Cyclophorus Monfort, 1810 (Caenogastropoda, Cyclophoridae) in the Natural History Museum, London, ZooKeys 411, pp. 1-56 : 22

Cyclophorus siamensis (Sowerby I, 1850)

Cyclostoma siamense Sowerby I, 1850: 158, pl. 31a, figs 292, 293. Pfeiffer 1854a: 323, pl. 42, figs 5, 6.

Cyclophorus siamensis - Reeve 1861: sp. 19. Kobelt 1902: 132.

Cyclophorus khasiensis Nevill, 1878: 273 ('new replacement name’).

Type locality.

Siam [Thailand].

Type material.

lLectotype (design. n.), NHMUK 20130088/1 ( Fig. 20A; D =51.2 mm, H=40.0 mm, W=5), paralectotype NHMUK 20130088/2 (1 shell; Fig. 20B; D =49.8 mm, H=39.5 mm, W=5).

Remarks.

The original description as well as those in Pfeiffer (1854a: 323) are particularly accurate, both showing the dark banding pattern and varix on the last whorl, and both figures appear to be from the same specimen. The NHM collections contain two shells from the Cuming collection with original labels stated the taxon name, type locality and "f. 292, 293". The specimen which corresponds to the illustrations in Sowerby I (1850) and Pfeiffer (1854a) is here designated as the lectotype.

Nevill (1878: 273) stated that Cyclostoma siamensis Sowerby I, 1850 occur in Khasi Hills, India not in Siam. Nevill considered this is an inappropriate taxon name, and Cyclophorus khasiensis Nevill, 1878 was nominated as a new replacement name based on specimens from the Godwin-Austen collection. This is however an unjustified replacement name, and therefore a junior objective synonym of Cyclostoma siamensis Sowerby I, 1850 ( ICZN 1999: Arts 18, 72.7). The specimens of Cyclophorus khasiensis in the Godwin-Austen collection have no nomenclatural status.

It should be noted that Kobelt (1902) attributed the date of publication of this species in error as “1843”. For the correct dates of publication for "Thesaurus Conchyliorum" see Petit (2009: 32).

Figures

Figure 20. Types of Cyclophorus species. A, B Cyclophorus siamensis (Sowerby I, 1850) A lectotype NHMUK 20130088 / 1, and B paralectotype NHMUK 20130088 / 2.