Revision of the deep-sea Eulimidae (Gastropoda, Caenogastropoda) from off Northeast Brazil
Souza, Leonardo Santos De
Pimenta, Alexandre Dias
Barros, José Carlos Nascimento De
Zootaxa
2021
2021-02-16
4927
4
451
504
Souza & Pimenta & Barros, 2021
Souza & Pimenta & Barros
2021
[151,357,1194,1221]
Gastropoda
Eulimidae
Eulima
Animalia
Caenogastropoda
13
464
Mollusca
species
cracentis
sp. nov.
( Figure 7A–I)
Type material. Holotype MNRJ 35202† ( Figure 7A–C); Paratypes: MNRJ 23225† [1 dd], from the type locality; MNRJ 35216† [2 dd] ( Figure 7D–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. Typelocality. 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 mmlong, 1.6 mmwide. Larval shell with about 2.25 whorls, 380 µmwide, 430 µmin 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. HolotypeMNRJ 35202†, 7.25 whorls, SL= 5.9 mm; BWL= 3.6 mm; AL= 2.4 mm; SW= 1.6 mm; AW= 1.0 mm. ParatypeMNRJ 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 typesof 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 7A–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. bifasciatashows 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 5A–E) and E. psila( Figure 6A–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 Eulimacollected in Guadeloupeat 200 mresembles 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 mto 465 m.
3041480311
[334,790,1338,1365]
MNRJ
13
464
MNRJ 35202
1
holotype
3041480347
[802,1432,1338,1365]
MNRJ
13
464
MNRJ 23225
1
paratype
3041480371
[151,1432,1374,1403]
2001-11-10
MNRJ
206
-4.2505555
Nordeste
21
-37.210278
13
464
MNRJ 35216
1
Ceara
paratype
3041480401
[151,1303,1410,1439]
2001-12-18
MNRJ
452
-9.333333
Nordeste
21
-34.983334
13
464
MNRJ 35265
1
Alagoas
paratype
3041480316
2000-03-25
RV Natureza
Brazil
465
-8.701667
Nordeste
21
-34.735
Off
13
464
1
Pernambuco
holotype
3041480329
[524,933,655,681]
Brazil
Ceara
15
466
1
Ceara