Carenzia carinata (Jeffreys 1877) Jeffreys 1877
- Dataset
- Seguenziidae (Gastropoda: Vetigastropoda) from SE Brazil collected by the Marion Dufresne (MD 55) expedition
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Seguenziida
- family
- Seguenziidae
- genus
- Carenzia
- species
- Carenzia carinata
description
Description: Shell small, broadly conical (nearly twice as wide as tall), strongly keeled, relatively thickwalled. Color homogeneous white to cream. Protoconch (~ 1 whorl) rounded, bulging, with pitted surface; transition visible as orthocline suture. Teleoconch smooth, except for strong spiral cord at periphery forming distinct keel and usually weaker median spiral cord on each whorl; both cords may bear rounded nodules, especially on last two whorls; nodules expanding axially toward adjacent cords, forming faint axial ribs, particularly on first two whorls. Basal portion of body whorl usually smooth, except for 1 – 2 very thin spiral threads near peripheral keel, and faint axial growth lines. Upper portion of whorls (above median cord) convex, and lower portion concave, resulting in a step-like profile. Suture shallow, but well-marked. Aperture quadrangular, acuminate toward peripheral keel, with strong columellar tooth. Umbilicus wide (1 / 4 – 1 / 5 of shell diameter), deep; umbilical periphery usually rounded and smooth, except for small nodules near the peristome. Measurements (in mm): 4 ¾ – 6 ¼ whorls, H = 1.8 ± 0.1, D = 3.1 ± 0.9, h = 0.75 ± 0.1, d = 1.0 ± 0.1.
discussion
Remarks: This species was reported by Clarke (1961) from the southeastern Atlantic, but this record was considered doubtful by subsequent authors (Laubier & Bouchet 1976; Quinn 1983 a). The new records expand the range of this species more than 1,000 km southward, from NE to SE Brazil.
distribution
Distribution: Amphi-Atlantic distribution, from the northern end of the Mid-Atlantic Ridge to the Canary Islands and from Florida, USA to the northeastern Brazilian coast; 732 – 2311 m depth (Quinn 1983 a; Rios 2009; Rosenberg et al. 2009). New occurrence: Southeastern Brazil, from Espírito Santo to Rio de Janeiro, 790 – 3450 m depth.
materials_examined
Material examined: Brazil: Espírito Santo: off São Mateus, continental slope of Abrolhos, 18 ° 59 ’ S 37 ° 47 ’ W, 1540 – 1550 m, MNHN, 34 shells, MZSP 116278, 15 shells (MD 55, sta. DC 70, 26 / v / 1987); 19 ° 00 ’ S 37 ° 48 ’ W, 950 – 1050 m, MNHN, 6 shells, (MD 55, sta. DC 72, 27 / v / 1987); 19 ° 01 ’ S 37 ° 47 ’ W, 1500 – 1575 m, MNHN, 1 shell, (MD 55, sta. CB 79, 28 / v / 1987); 19 ° 08 ’ S 37 ° 34 ’ W, 3450 m, MNHN, 2 shells, MZSP 116276, 1 shell (MD 55, sta. DS 66, 25 / v / 1987); 19 ° 40 ’ S 37 ° 48 ’ W, 790 – 940 m, MNHN, 17 shells, MZSP 116275, 9 shells (MD 55, sta. CB 77, 27 / v / 1987); Rio de Janeiro: E of Cabo de São Tomé, 21 ° 25 ’ S 39 ° 56 ’ W, 1400 – 1420 m, MNHN, 5 shells, MZSP 116277, 4 shells (MD 55, sta. DS 05, 09 / v / 1987); E of Cabo Frio, 22 ° 50 ’ S 40 ° 15 ’ W, 1835 – 1872 m, MNHN, 1 shell, (MD 55, sta. SY 03, 09 / v / 1987); S of Cabo Frio, 24 ° 12 ’ S 42 ° 15 ’ W, 1555 m, MNHN, 2 shells, (MD 55, sta. CB 108, 02 / vi / 1987).
materials_examined
Type locality: Valorous station 13, North Atlantic; 56 ° 01 ’ N 34 ° 42 ’ W, 1263 m (Quinn 1983 a).