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

publication ID

https://doi.org/10.11646/zootaxa.4927.4.1

publication LSID

lsid:zoobank.org:pub:AED51D9E-1751-4010-A8E1-B72AE428821A

DOI

https://doi.org/10.5281/zenodo.4542949

persistent identifier

https://treatment.plazi.org/id/90A622EA-9131-4BB6-8AAC-6187B4071FD8

taxon LSID

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

treatment provided by

Plazi

scientific name

Eulima cracentis
status

sp. nov.

Eulima cracentis sp. nov.

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

( Figure 7 View FIGURE 7 A–I)

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

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

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 View 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 View FIGURE 7 ), 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 View FIGURE 5 A–E) and E. psila ( Figure 6 View 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.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Caenogastropoda

Family

Eulimidae

Genus

Eulima