Dicharax (?) spiracellum (A. Adams & Reeve, 1850)

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

Dicharax (?) spiracellum (A. Adams & Reeve, 1850)

Cyclostoma spiracellum A. Adams & Reeve, 1850: 56, pl. 14, fig. 1.

Alycaeus spiracellum - E. von Martens 1867: 150-151; Reeve 1878: pl. 4, species 33; Godwin-Austen 1889: 346, pl. 37, fig. 6.

Alycaeus (Dicharax) spiracellum - Kobelt 1902: 376.

Alycaeus kurodai Pilsbry & Y. Hirase 1908: 60, pl. 4, figs 1-4.

Alycaeus kurodae (sic) - Pilsbry 1926: 454.

Chamalycaeus (Metalycaeus) kurodai - Kwon and Habe 1979: 26.

Dicharax spiracellum Páll-Gergely 2019: 192, fig 1A-D. ( kurodai Pilsbry & Y. Hirase, 1908 is a synonym)

Type locality.

"Borneo, under decayed vegetable matter in the forests" ( spiracellum ), "Cheju (Quelpart) Island" ( kurodai ). Páll-Gergely (2019) emended the type locality of C. spiracellum to "probably Cheju Island, South Korea". See Remarks.

Material examined.

Borneo, 'Samarang pl. 14. F. 1' (in pencil), coll. Mrs Lombe Taylor, NHMUK 1874.12.11.233 (possible syntype); Borneo, NHMUK 1889.12.7.27 (1 shell); 済州島 (Seishūtō = Jeju Island), coll. Hirase (#275) NSMT-Mo 7593 (4 shells, labelled as A. kurodai ); ANSP 95742 (1 syntype of A. kurodai ) (photographs examined).

Remarks.

protoconch low, rather matte, with irregular fine wrinkles; R2 with ca. 24 low ribs; boundaries between ribs hardly visible; ribs situated very close to each other near tube; distance between ribs at edge of body whorl roughly a rib width; no spiral lines visible on R1.

Dicharax spiracellum (A. Adams & Reeve, 1850) was described from Borneo, based on shells from the expedition of HMS Samarang (1843-1846). Alycaeus kurodai Pilsbry & Y. Hirase, 1908, described from the Korean Cheju Island, is conchologically identical to Dicharax spiracellum and is a junior synonym of the former species ( Páll-Gergely 2019). The type specimens of Dicharax spiracellum were probably obtained when the Samarang visited Cheju Island, and the specimens were most likely mislabelled ( Páll-Gergely 2019). Therefore, the type locality of D. spiracellum was emended to "probably Cheju Island, South Korea" ( Páll-Gergely 2019).