Hypselostoma tertiusfrater Gojšina & Páll-Gergely, 2025

Hypselostoma tertiusfrater Gojšina & Páll-Gergely nom. nov.

Figs 224 J View Figure 224 , 238 View Figure 238 , 239 View Figure 239

Boysidia (Dasypupa) salpinx Thompson & Dance, 1983: 106–107, figs 2–8. View in CoL

Boysidia salpinx View in CoL — Dumrongrojwattana and Assawawattagee 2018: 216; Marzuki et al. 2021: 103–104, figs 45 E, 50 B; Inkhavilay and Sutcharit 2024: 441, fig. 1 D.

Type material examined.

Malaysia • holotype; UF 35944 • 33 paratypes; from the type locality; UF 36281 / 2, used for SEM by F. G. Thompson, destroyed; UF 35946 / 31 .

Additional material examined.

Malaysia • 3 shells; Borneo, Sarawak, 4 th Div., Niah Caves Nat. Park , near Painted Cave ; Aug. 2002; coll. PGB • 24 shells; Borneo, Sarawak, SE portion, Bau area , Gunong Kapor, entrance to main cave; UF 35945 • 397 shells; Borneo, Sabah, ca 20 km upstream from Simatuoh, E side of Sapulut R., Batu Punggul ; 16. May 1988; D. K. Dorman leg; locality code DKD- 91, UF 196670 • 190 shells; Borneo, Sarawak, Fourth division, Niah Caves National park, summit of Gunong Subis, SE Batu Niah ; 03°48'N, 113°46′E; 29 Apr. 1988; D. K. Dorman leg.; locality code DKD- 77, UF 196488 GoogleMaps • 15 shells; same data as previous; UF 196487 GoogleMaps • 1 shell; Borneo, Sabah, ca 20 km upstream from Simatuoh, E side of Sapulut R., Batu Punggul ; 04°38.8'N, 116°36.7'E; 16. May 1988; D. K. Dorman leg.; locality code DKD- 90, UF 196667 GoogleMaps • 91 shells; same data as previous; locality code DKD-091 ; UF 196669 GoogleMaps • 26 shells; Borneo, Sarawak, SW portion, S of Serian, E side Gunong Selabor, main entrance Lobang Batu cave ; UF 35948 • 25 shells; Borneo , Sarawak, SW portion S side Gunong Selabor, S of Serian; UF 35947 • 3 shells; Sabah, ca. 25 km W Kunak, Baturong Caves ; 04°37'N, 118°09'E; 12. Jun. 1988; David K. Dorman leg.; locality code DKD-102 ; UF 196829 GoogleMaps .

Type locality.

“ Gunong Subis, limestone massif about 40 mi SW of Mira, Niah area, Fourth Div., Sarawak, Borneo, 03°51'N, 113°45'E ”.

Differential diagnosis.

This species is clearly different from the two congeners from Borneo ( H. paini and H. procerum ) by its depressed-conical shell (vs conical) and a wider umbilicus.

Etymology.

The specific epithet is made of tertius meaning third and frater meaning brother, given the fact that this is one of three Hypselostoma species described from Borneo.

Distribution.

This species in known from Sarawak and Sabah, Borneo.

Remarks.

Boysidia salpinx F. G. Thompson & Dance, 1983 is moved to the genus Hypselostoma herein, and thus, becomes a secondary homonym of Hypselostoma salpinx ( van Benthem Jutting, 1961) . Therefore, Hypselostoma tertiusfrater nom. nov. is proposed as a replacement name.