Habeastrum parafusum, 2019

Simone, Luiz Ricardo L., 2019, The new genus Habeastrum, with two new species (Gastropoda, Diplommatinidae) in Mato Grosso do Sul caves, Brazil, Zootaxa 4543 (2), pp. 287-290 : 287-288

publication ID	https://doi.org/10.11646/zootaxa.4543.2.7
publication LSID	lsid:zoobank.org:pub:0CDAB733-EA1B-4793-873D-609CC50F83B4
persistent identifier	https://treatment.plazi.org/id/6CA1A8C0-4891-4F7C-B1C1-489B9E1B89F7
taxon LSID	lsid:zoobank.org:act:6CA1A8C0-4891-4F7C-B1C1-489B9E1B89F7
treatment provided by	Plazi (2019-03-30 06:46:11, last updated 2019-03-31 02:01:49)
scientific name	Habeastrum parafusum
status	new species

Treatment

Habeastrum parafusum new species ( Figures 1 View FIGURE 1 A–J)

urn:lsid:zoobank.org:act:6CA1A8C0-4891-4F7C-B1C1-489B9E1B89F7 .

Types. holotype MZSP 134301 View Materials ( Fig. 1A View FIGURE 1 ). Paratypes : MZSP 135584 View Materials , 7 View Materials figured shells , MZSP 135585 View Materials , 15 View Materials 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) GoogleMaps .

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 View FIGURE 1 A–G). Total of about 7 whorls. Protoconch 0.39 mm wide, smooth, except for minute radial wrinkles, translucent ( Figs 1H View FIGURE 1 , 10); occupying about 43% of shell width, about 15% of shell length. Teleoconch up to 6 whorls, sometimes with narrow profile ( Figs 1B, F View FIGURE 1 ), sometimes slightly wider ( Figs 1A, C View FIGURE 1 ), sometimes intermediate ( Figs 1D, E, G View FIGURE 1 ). 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 View FIGURE 1 ); 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 View FIGURE 1 ).

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 View FIGURE 1 ); Paratypes MZSP 135584: #2: 1.7 mm by 0.8 mm ( Fig. 1B View FIGURE 1 ); #3, 1.6 mm by 0.9 mm ( Fig. 1C View FIGURE 1 ); #4, 1.6 mm by 0.8 mm ( Fig. 1D View FIGURE 1 ); #5, 1.4 mm by 0.7 mm ( Fig. 1E View FIGURE 1 ); #6, 1.1 mm by 0.7 mm ( Fig. 1F View FIGURE 1 ); #7, 1.2 mm by 0.7 mm ( Fig. 1G View FIGURE 1 ).

Etymology. The specific epithet refers to the general appearance of the shell, resembling a screw, “ parafuso ” in Portuguese, arbitrarily Latinized with the neutral termination.

Figures

FIGURE 1. Habeastrum spp. shells. A–J. Habeastrum parafusum, n. sp. A. Holotype MZSP 134301, L 1.4 mm. B–J. Paratypes MZSP 135584, L 1.7 mm. C. L 1.6 mm. D. L 1.6 mm. E. L 1.4 mm. F. SEM, L 1.1 mm. G. L. 1.2 mm. H. same specimen, showing protoconch and first teleoconch whorls, SEM, scale = 0.1 mm. I. same specimen of F, scale = 0.1 mm. J. Young specimen, L 0.6 mm. K–R. H. omphalium n. sp. K–N. Holotype MZSP 135583, W 1.1 mm, L 1.6 mm. O–R. Paratypes MZSP 134324. O. L 1.0 mm. P. SEM, L 1.0 mm. Q–R. Scale = 0.1 mm.