Eulima cracentis, 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 : 464-466

Eulima cracentis sp. nov.

urn:lsid:zoobank.org:act:90A622EA-9131-4BB6-8AAC-6187B4071FD8

( Figure 7 A–I)

Type material. Holotype MNRJ 35202 † ( Figure 7 A–C) ; Paratypes: MNRJ 23225 † [1 dd], from the type locality ; MNRJ 35216 † [2 dd] ( Figure 7 D–I), off Ceará, REVIZEE Nordeste (04°15′02″S 37°12′37″W, 206 m), 10/xi/2001 ; MNRJ 35265 † [1 dd], off Alagoas, REVIZEE Nordeste (09°20′00″S 34°59′00″W, 452 m), 18/xii/2001 .

Type locality. Brasil: Off Pernambuco, REVIZEE Nordeste (08°42′06″S 34°44′06″W, 465 m), coll. RV Natureza, 25/iii/2000 .

Etymology. From the Latin cracens, meaning neat, graceful; relative to the appearance of the shell.

Description (Holotype). Shell conical, apex small and obtuse, reaching 5.9 mm long, 1.6 mm wide. Larval shell with about 2.25 whorls, 380 µm wide, 430 µm in height; smooth, transition to teleoconch marked by an almost indistinct incremental scar. Teleoconch with about 5 whorls, slightly sinuous outline, convexity confined to the lower region of each whorl; suture shallow, slightly impressed, sloping; subsutural zone about 1/4 of the height of the whorl; surface glossy and smooth; incremental scars weak, appearing at irregular intervals, frequent. Last whorl about 60% of the shell length; base elongated with slightly rounded outline. Aperture high, narrow, pear shaped, acute posteriorly and rounded anteriorly; outer lip thin, almost straight, opisthocline, slightly projecting near the suture and slightly retracting in the distal region; inner lip sinuous, sloping and well demarcated. Not umbilicate. Shell vitreous, or whitish, with a brownish spiral band at the suprasutural region of the teleoconch, last whorl with a duplicate spiral band in dorsal view.

Measurements. Holotype MNRJ 35202†, 7.25 whorls, SL= 5.9 mm; BWL= 3.6 mm; AL= 2.4 mm; SW= 1.6 mm; AW= 1.0 mm. Paratype MNRJ 35216†, 8 whorls, SL= 6.8 mm; BWL= 4.2 mm; AL= 2.7 mm; SW= 1.9 mm; AW= 1.3 mm.

Remarks. All types of the present species were destroyed; however, it has consistent shell features that allow the description as a new species, and the figures provided here are sufficient for its recognition.

Eulima cracentis sp. nov. presents brownish spiral bands on the teleoconch ( Figure 7 A–C), which is a common feature in the genus. Eulima cracentis sp. nov. can be distinguished from E. bifasciata , a shallow water species of the western Atlantic, by the presence of a single brownish spiral band on the teleoconch, except on the last whorl ( Figure 7C ), while E. bifasciata shows two brownish spiral bands per whorl (see Lamy & Pointier 2017: plate 88, figure 1a, b). Furthermore, E. cracentis sp. nov. has more convex teleoconch whorls and a more inflated body whorl.

Eulima cracentis sp. nov. can also be distinguished from E. ephamilla ( Figure 5 A–E) and E. psila ( Figure 6 A–M) by the presence of the brownish spiral band at the teleoconch, more convex teleoconch whorls and the relatively higher aperture in relation to the body whorl length (ratio AL/BWL= 0.67, 0.60 and 0.63, respectively). Furthermore, E. cracentis sp. nov. has a smaller number of protoconch whorls (2.25 vs. 3.5) and a wider protoconch (380 µm vs. 320 µm) than E. psila .

The shell figured by Lamy & Pointier (2017: plate 88, figure 4a–b) of an unnamed species of Eulima collected in Guadeloupe at 200 m resembles E. cracentis sp. nov., but has a narrower protoconch and teleoconch, and seems to have just a single spiral band on the body whorl.

Geographical distribution. Brazil: Ceará, Pernambuco, Alagoas .

Bathymetric distribution. From 206 m to 465 m.

Figures

FIGURE 5.A–E. Eulima ephamilla Watson, 1883.A, B. Lectotype (herein designated) of E. ephamilla, NHMUK 1887.2.9.1589; C. Paralectotype of E. ephamilla, NMW 1955.158.11088. D, E. Holotype of Eulima rectiuscula Dall, 1890, USNM 87343. F, G. Eulima incolor Bouchet & Warén, 1986: holotype, MNHN-IM-2000-5660. Scale bars: 1.0 mm. Credits: A–C, courtesy of NHMUK; D. courtesy of NMW; F, G, courtesy of MNHN-IM.

FIGURE 6. A–L. Eulima psila Watson, 1883.A. Lectotype (herein designated), NHMUK 1887.2.9.1585. B. IBUFRJ 15233. C. MNRJ 27968. D. MNRJ 35203. E. USNM 433360. F–I, K. MNRJ 25613. J. MNRJ 34490. L, M. MNRJ 16888. N, O. Eulima sp., from Challenger stn. 24, NMW 1955.158.00654. P, Q. Eulima grimaldii Bouchet & Warén, 1986: holotype, MNHN-IM 2000-5659. I. Operculum, external surface. J, K. Detail of protoconch, frontal view. L. Detail of protoconch, apical view. Scale bars:A–F, M–P= 1.0 mm; G, H= 500 µm; I–K= 200 µm; L= 100 µm. Credits:A, courtesy of NHMUK; M, N, courtesy of NMW; O, P, courtesy of MNHN-IM.

FIGURE 7. A–I. Eulima cracentis sp. nov. A–C. Holotype, MNRJ 35202. D–I. Paratype, MNRJ 35216. H. Detail of protoconch, frontal view. G. Detail of protoconch, apical view. Scale bars: A–E= 1.0 mm; F–G= 500 µm; H–I= 100 µm.