Dyakia mindainensis (Bock, 1881)
“This form shows but six whorls. There are several similar forms like N. janus, Chemn., N. hugonis, Pfr., and N. amphidroma, . Martens, that may prove to be all one species.” (Aldrich, 1889)
“One fine specimen, larger than the type described by Bock, measuring 38 instead of 30 mill., but agreeing with it in every other respect.” (Schepman, 1896)
Bock (1881) original descriptions on Helix mindaiensis – “Shell very slightly umbilicated, sinistral, convexly conoid, semitransparent, of a reddish brown colour, with a white-tipped lip. Spire conical, with slightly convex, sculptured with finely granulated radiating striae, regularly increasing; the last acutely keeled. Aperture oblique, lunate. Peristome sharp, slightly thickened; upper margin short, oblique, the basal (seen from beneath) rather sinuous.”
Dohrn (1881) original descriptions on Nanina sarawakana – “T. perforata, sinistrorsa, acute carinata, depresse turbinata, pellucida, albido-cornea, ad peripheriam rufo-fusco bifasciata; spira convexo conoidea, apice obtusula; anfr. 6 subplani, lente accrescentes, primi 2 vix striati, ceteri confertim et subtiliter decussati, ultimus infra carinam distinctius striatus, nitens; apert. diagonalis, oblique securiformis; perist. simplex, rectum, margine columellari circa perforationem protracto.”
Tryon (1886) descriptions on Nanina mindaiensis – “Narrowly umbilicated, semitransparent; reddish brown, with a white-tipped lip; whorls 6, with finely granulated radiating striae, the last whorl acutely keeled.”
Helix mindaiensis – “Greatest diam. 30 millim., axis 13 millim.” (Bock, 1881); Nanina sarawakana – “Diam. maj. 19, min. 17, alt. 8 mm.” (Dohrn, 1881); Nanina mindaiensis – “Diam. 30, alt. axis 13 mill.” (Tryon, 1886)
Type locality – Dyakia mindaiensis “Mindai, Amontai district” (Bock, 1881); Nanina sarawakana “insula Borneo: Sarawak” (Dohrn, 1881)
Other localities – “Kusan and Penggiron districts in South-eastern Borneo” leg. W. Doherty (Aldrich, 1889); “Cavern on Mount Liang Koeboeng, 800 m” Büttikofer/Mar. 1894 (Schepman, 1896)