Melanella anapetes, Souza & Pimenta & Barros, 2021

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), pp. 451-504 : 480-482

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Melanella anapetes

sp. nov.

Melanella anapetes sp. nov.

( Figure 16 View FIGURE 16 A–G)

Type material. Holotype MNRJ 35269 View Materials † ( Figure 16 View 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 View Materials † [1 dd] GoogleMaps .

Type locality. Brazil: Off Alagoas, REVIZEE Nordeste (10°06′35″S 35°46′41″W, 720 m), coll. RV Natureza, 16/xii/2001 GoogleMaps .

Etymology. From anapetes Gr. , which means wide open, expanded; relative to the elongated aperture of the species.

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.

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 16A, B View FIGURE 16 ), including that of the protoconch ( Figure 16D View FIGURE 16 ).

Melanella anapetes sp. nov. has a broad aperture ( Figure 16E View FIGURE 16 ) like M. hians ( Figure 9J View FIGURE 9 ), 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 View 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 View FIGURE 11 A–I) and M. sarissa ( Figure 12 View 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.