Habeastrum parafusum, Simone, 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
DOI	https://doi.org/10.5281/zenodo.5941067
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 2024-11-27 18:52:52)
scientific name	Habeastrum parafusum
status	sp. nov.

Treatment

Habeastrum parafusum View in CoL 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.