Cyclophorus sp. 1

Cyclophorus sp. 1

Conchological description. Medium-sized Cyclophorus species, overall shell shape rounded, aperture typically circular. Shell height 23.1 to 26.5 mm (mean = 25.0 mm), shell breadth 28.7 to 31.9 mm (mean = 29.9 mm). Number of whorls 5.25. Early whorls with or without bluish colouration. Shape of body whorl uncompressed or slightly compressed; rounded or well-rounded. Lip reflected and simple. Lip colour yellow. Wing-shaped projection at columellar margin present and not pronounced, absent, or present and pronounced. Peripheral band dark brown or absent. Colour pattern generally variable. Typical elements of pattern above position of peripheral band: spiral lines, spiral bands and zig-zag stripes in different shades of brown. Typical elements of pattern below position of peripheral band: spiral lines, spiral bands and transverse lines in darker shades of brown.

Displayed specimens. VNM073 ( Fig 13a View Fig 13 ), soft body in ethanol (previously in formalin) and dry shell; NHMUK 20180448 (ethanol-preserved frozen tissue sample NHMUK Barcode 014041342); GenBank accession numbers MN153341 (COI), MN153390 (16S), MN153437 (28S); male individual; shell height 24.6 mm, shell breadth 28.7 mm, number of whorls 5.25. VNM074 ( Fig 13b View Fig 13 ), soft body in ethanol (previously in formalin) and dry shell; NHMUK 20180447 (ethanol-preserved frozen tissue sample NHMUK Barcode 014041341); GenBank accession numbers MN153342 (COI), MN153391 (16S), MN153438 (28S); male individual; shell height 25.5 mm, shell breadth 29.5 mm, number of whorls approx. 5.25 (pieces of first whorl missing). VNM075 ( Fig 13c View Fig 13 ), soft body in ethanol (previously in formalin) and dry shell; NHMUK 20180452 (ethanol-preserved frozen tissue sample NHMUK Barcode 014041343); GenBank accession numbers MN153343 (COI), MN153392 (16S), MN153439 (28S); female individual; shell height 26.5 mm, shell breadth 30.7 mm, number of whorls approx. 5.25 (pieces of first whorl missing).

Locality and sampling data. VNM073, VNM074, VNM075: Vietnam, Hoa Binh, Cao Duong commune, bought at market stall (20.72542˚, 105.64899˚), collected nearby according to the merchant; purchased on 26 May 2016; purchased by Tu Van Do, Takahiro Hirano & Takumi Saito.

Diagnosis. Cyclophorus sp. 1 can be differentiated from all herein characterised Cyclophorus species based on DNA sequence data. Diagnostic nucleotide substitutions of the cytochrome c oxidase subunit I (COI) gene: 55:A, 94:A, 97:G, 412:G, 511:G (numbers indicate the position in the studied COI fragment).

Remarks. This species is so far undescribed. As the studied material of Cyclophorus sp. 1 has been bought on a market, the species’ exact distribution remains unknown.