Melanella anapetes Souza, Pimenta, and Barros 2021
- Dataset
- Revision of the deep-sea Eulimidae (Gastropoda, Caenogastropoda) from off Northeast Brazil
- Rank
- SPECIES
- Published in
- Souza, Leonardo Santos De, Pimenta, Alexandre Dias, Barros, José Carlos Nascimento De (2021): Revision of the deep-sea Eulimidae (Gastropoda, Caenogastropoda) from off Northeast Brazil. Zootaxa 4927 (4): 451-504, DOI: 10.11646/zootaxa.4927.4.1
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Caenogastropoda
- family
- Eulimidae
- genus
- Melanella
- species
- Melanella anapetes
description
(Figure 16 A – G)
description
Description (Holotype). Shell conical, elongated, apex obtuse, reaching 8 whorls, 4.4 mm long, 1.2 mm wide. Larval shell conical, smooth, transition to teleoconch indistinct. Teleoconch whorls convex; suture well demarcated, sloping; surface smooth; incremental scars slightly demarcated, appearing in irregular intervals. Last whorl almost 60 % of the shell length; base rounded, elongated. Aperture high and narrow, pear shaped, acute posteriorly and rounded anteriorly; outer lip thin, prosocline, sinuous, projecting gradually from the suture and reaching the maximum projection in the middle of the height; inner lip sinuous, slightly twisted, sloping and well demarcated. Not umbilicate. Shell vitreous. Measurements. Holotype MNRJ 35269 †, 8 whorls, SL = 4.4 mm; BWL = 2.5 mm; AL = 1.6 mm; SW = 1.2 mm; AW = 0.8 mm.
discussion
Remarks. The slightly twisted columella resembles species of Haliella Monterosato, 1878, but the latter genus usually comprises species with cylindrical shell and a blunt apex (Bouchet & Warén 1986: 338). We prefer to include this species in Melanella because of its conical shape (Figure 16 A, B), including that of the protoconch (Figure 16 D). Melanella anapetes sp. nov. has a broad aperture (Figure 16 E) like M. hians (Figure 9 J), but it is less expanded laterally and the former species is much smaller (holotype: 8 whorls, SL = 4.4 mm, SW = 1.2 mm v s. syntype of M. hians NHMUK 1887.2.9.1588: 10 whorls, SL = 10.1 mm, SW 3.3 mm). Melanella anapetes sp. nov. resembles M. adiastalta sp. nov. (Figure 15 A – G) in the outline of the outer lip, but has a more elongated shell shape (ratio SW / SL = 0.28 vs. 0.37 in M. adiastalta sp. nov.) and aperture (ratio AW / AL = 0.5 vs. 0.6). Melanella anapetes sp. nov. differs from M. doederleini (Figure 11 A – I) and M. sarissa (Figure 12 A – L) by the more elongated aperture (ratio AW / AL = 0.5, 0.7 and 0.6, respectively). Geographical distribution. Brazil: Alagoas and Bahia. Bathymetric distribution. From 510 to 720 m.
etymology
Etymology. From anapetes Gr., which means wide open, expanded; relative to the elongated aperture of the species.
materials_examined
Type material. Holotype MNRJ 35269 † (Figure 16 A – G). Paratype: Brazil: Off Bahia state, REVIZEE Nordeste (11 ° 35 ′ 30 ″ S 37 ° 12 ′ 18 ″ W, 510 m), 30 / x / 2000: MNRJ 35281 † [1 dd]. Type locality. Brazil: Off Alagoas, REVIZEE Nordeste (10 ° 06 ′ 35 ″ S 35 ° 46 ′ 41 ″ W, 720 m), coll. RV Natureza, 16 / xii / 2001.