Hypselostoma everetti E. A. Smith, 1896

Hypselostoma everetti E. A. Smith, 1896

Figs 111 T View Figure 111 , 136 View Figure 136 , 137 View Figure 137 , 140 View Figure 140

Hypselostoma everetti Smith, 1896: 148, Plate 10, fig. 9–9 b. View in CoL

Hypselostoma dohertyi Fulton, 1899: 215, pl. 11, fig. 17. syn. nov. View in CoL

Gyliauchen everetti — Pilsbry 1917: 218–219, pl. 37, figs 4, 6, 10.

Gyliauchen dohertyi — Pilsbry 1917: 219–220, pl. 37, figs 7–9.

Gyliotrachela everetti View in CoL — van Benthem Jutting 1950: 45; Vermeulen and Whitten 1998: 80–81, fig. 64.

Gyliotrachela dohertyi — van Benthem Jutting 1950: 45; Zilch 1984: 165.

Type material examined.

Indonesia • syntype of H. everetti ; NHMUK 1896.5. 17.1–6; syntype of H. dohertyi ; SMF 4586 / 1.

Additional material examined.

Indonesia • 2 shells; Kalao island , Celebes; SMF 227446 About SMF • 2 shells; Kalao island , T. H. Aldrich coll.; UF 00112280 . • 1 shell; Timor island , 1 km W. Baucau; 18. Aug. 1971; F. G. Thompson leg.; locality code FGT-1729 ; UF 210107 .

Type localities.

“ Kalao island ”, Indonesia ( H. everetti ); “ Tenimber I ”, (= Tanimbar islands, Indonesia) ( H. dohertyi ).

Differential diagnosis.

This species differs from other congeners by the presence of strong keel (almost like a shoulder) positioned slightly above the centre of the periphery and a very wide umbilicus.

Distribution.

This species is known from Timor island, Kalao island, Sulawesi, Java, Bali, Lesser Sunda islands and Tanimbar islands (latter is the type locality of H. dohertyi ).

Remarks.

During examination of the type material, we found no clear differences between H. everetti and H. dohertyi . The differences mentioned by Fulton (1899) in the original description include the narrower shell, less detached aperture, “ not perspectively umbilicated ” shell and that the shell is “ more closely coiled below ”. The umbilicus appears very slightly narrower in H. dohertyi but this falls within the intraspecific variability. Other characters mentioned are also very similar between the two species and also fall within the intraspecific variability, which is especially true for the level of the detachment of the last whorl.