Sticteulima cabrali, 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 : 487-489

Sticteulima cabrali sp. nov.

urn:lsid:zoobank.org:act:84C6DFD0-FD21-4784-A28E-8EF10C922A65

( Figure 20 A–H)

Type material. Holotype MNRJ 23195 † ( Figure 20A ) ; Paratypes: from type locality, MNRJ 35194 † [2] ( Figure 20 B–H) .

Type locality. Brazil: Off Rio Grande do Norte, REVIZEE Nordeste (04°51′40″S 35°08′01″O, 384 m), coll. RV Natureza, 24/xi/2001 .

Etymology. named after Enílson Cabral of the Research and Management Center of Fishing Resources of the Northeast Coast (CEPENE/IBAMA) for his personal efforts in the collections of sediment from the continental slope off Northeast Brazil.

Description (Holotype). Shell conical, straight, reaching about 2.7 mm long, 1.2 mm wide. Larval shell vitreous, with a brownish spiral band at the suture, conical, 3.4 whorls, 380 µm wide, smooth, transition to teleoconch marked by an almost indistinct incremental scar. Teleoconch with about 4.5 whorls, outline slightly convex; suture almost indistinct, sloping slowly; subsutural zone indistinct; surface slightly sculptured by axial lines; incremental scars demarcated, appearing at irregular intervals. Last whorl about 55% of the shell length; base rounded. Aperture wide, pear shaped, acute posteriorly and rounded anteriorly; outer lip thin, opisthocline, sinuous, slightly retracting near the suture and projecting in the uppermost third; inner lip slightly sinuous, sloping, reflected and well demarcated. Small umbilical chink present. Shell vitreous, with irregular brownish patches.

Measurements. Holotype MNRJ 23195†, 8 whorls, SL= 2.7 mm; BWL= 1.5 mm; AL= 1.1 mm; SW= 1.2 mm; AW= 0.7 mm. Paratype MNRJ 35194, 8 whorls, SL= 2.9 mm; BWL= 1.5 mm; AL= 1.1 mm; SW= 1.2 mm; AW= 0.7 mm.

Remarks. Sticteulima cabrali sp. nov. ( Figure 20 A–H) differs from most of its congeners mainly by the presence of microsculpture of axial lines on the teleoconch ( Figure 20D ). Furthermore, it differs from S. lata by having more convex teleoconch whorls; from S. richteri and S. wareni by the different color pattern, presenting irregular brownish patches on the shell ( Figure 20A ) in spite of a well-defined brownish spiral band like in S. richteri or a solid brown shell like in S. wareni ; from S. fuscescens by the faster increasing diameter, reaching a greater width and by the smooth surface of the protoconch ( Figure 20G, H ), while S. fuscescens has strong opisthocline axial lines in the protoconch.

Sticteulima cabrali sp. nov. resembles two other species currently in Eulima : E. chaunax Watson, 1883 , only known from the type locality in Puerto Rico, and E. fuscozonata , from off Spain and Portugal. Sticteulima cabrali sp. nov. differs from both by the presence of a microsculpture on the teleoconch, while the others are smooth. Furthermore, S. cabrali sp. nov. has a colored shell while E. chaunax is whitish, and is proportionally smaller (holotype: SL= 2.7 mm vs. syntype of E. chaunax NHMUK 1887.2.9.1584: SL= 3.8 mm; both with 8–9 whorls); and E. fuscozonata has no umbilicus.

Geographical distribution. Only known from the type locality.

Bathymetric distribution. 384 m.

Figures

FIGURE 20. A–H. Sticteulima cabrali sp. nov. A. Holotype, MNRJ 23195. B–H. Paratype, MNRJ 35194. D. Detail of teleoconch sculpture. G. Detail of protoconch, frontal view. H. Detail of protoconch, apical view. Scale bars: A–C= 1.0 mm; D= 50 µm; E, F= 200 µm; G, H= 100 µm.