The new genus Habeastrum, with two new species (Gastropoda, Diplommatinidae) in Mato Grosso do Sul caves, Brazil Author Simone, Luiz Ricardo L. text Zootaxa 2019 2019-01-07 4543 2 287 290 journal article 27702 10.11646/zootaxa.4543.2.7 c5d46c52-27c5-4b8d-a9d3-b4b3ff22de8f 1175-5326 2617833 0CDAB733-EA1B-4793-873D-609CC50F83B4 Habeastrum parafusum new species ( Figures 1 A–J) urn:lsid:zoobank.org:act: 6CA1A8C0-4891-4F7C-B1C1-489B9E1B89F7 . Types. holotype MZSP 134301 ( Fig. 1A ). Paratypes : MZSP 135584 , 7 figured shells , MZSP 135585 , 15 shells , MNRJ, 2 shells, USNM, 2 shells all from type locality. Type locality. BRAZIL . Mato Grosso do Sul , Bonito , Gruta Pitangueiras , 21°06’37”S 56°34’52”W ( Trajano & Gnaspini col., 16.vii.1992 ) . Diagnosis. Shell with about 7 whorls, 3–4 whorls preceding aperture increasing relatively less in diameter. Description. Shell turriform, narrowly conical, almost cylindrical. First three whorls slightly sharper pointed, profile angle ~40°; gradually becoming more cylindrical in 4–5 remaining whorls, with inflation relatively small, outline angle ~20° ( Figs 1 A–G). Total of about 7 whorls. Protoconch 0.39 mm wide, smooth, except for minute radial wrinkles, translucent ( Figs 1H , 10); occupying about 43% of shell width, about 15% of shell length. Teleoconch up to 6 whorls, sometimes with narrow profile ( Figs 1B, F ), sometimes slightly wider ( Figs 1A, C ), sometimes intermediate ( Figs 1D, E, G ). Teleoconch sculpture as for genus (Fig. H), with about 65 axial cords on penultimate whorl. Suture deep, whorl profile rounded. Aperture rounded, not deviating from whorl profile, slightly prosocline ( Figs 1D, G, I ); minimally deformed by penultimate whorl; occupying about 44% of shell width, about 25% of shell length. Umbilicus deep, narrow, occupying about 12% of inferior shell area ( Fig. 1I ). Distribution. Known only from the type locality, possibly endemic. Habitat. In soil in caves (no living specimen found). Measurements (length and width in mm): Holotype 1.4 mm by 0.8 mm ( Fig. 1A ); Paratypes MZSP 135584: #2: 1.7 mm by 0.8 mm ( Fig. 1B ); #3, 1.6 mm by 0.9 mm ( Fig. 1C ); #4, 1.6 mm by 0.8 mm ( Fig. 1D ); #5, 1.4 mm by 0.7 mm ( Fig. 1E ); #6, 1.1 mm by 0.7 mm ( Fig. 1F ); #7, 1.2 mm by 0.7 mm ( Fig. 1G ). Etymology. The specific epithet refers to the general appearance of the shell, resembling a screw, “ parafuso ” in Portuguese, arbitrarily Latinized with the neutral termination.