Benthonellania lozoueti Amati & Giulio & Oliverio 2022, n. sp.
Creators: name: Amati, Bruno
name: Giulio, Andrea Di
name: Oliverio, Marco
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Rissoidae
Benthonellania
Benthonellania lozoueti

description: Benthonellania lozoueti n. sp.
(Figs 21; 22 E-I; 25F; 26N; Tables 1; 2)
urn:lsid:zoobank.org:act: 3D02DD07-801C-4BE4-ABE3-F5D4FF4EAD2F
TYPE MATERIAL. — Holotype. Marquesas • 1 dd (height 4.33 mm, width 2.66 mm, Figs 21 A-C, 22E-I); Fatu Hiva, MUSORSTOM 9 Stn DR1244; 10°28’S, 138°42’W; 1.IX.1997; 1015-1020 m depth; MNHN-IM-2000-37701
Paratypes • 10 dd; same locality data as holotype • 6 dd; MNHN- IM-2000-37703; Fatu Hiva, Stn DR 1247; 10°34’S, 138°42’W; 1.IX.1997; 1150-1250 m depth; MNHN-IM-2000-37702.
OTHER MATERIAL EXAMINED. — Marquesas • 3 dd; Eiao, MUSORSTOM 9 Stn CP 1278; 7°52’S, 140°39’W; 5.IX.1997; 1000 m depth; MNHN • 1 dd; Eiao, MUSORSTOM 9 Stn DW 1275; 7°53’S, 140°38’W; 5.IX.1997; 627 m depth; MNHN.
TYPE LOCALITY. — Marquesas, Fatu Hiva, MUSORSTOM 9 Stn DR1244; 10°28’S, 138°42’W; 1.IX.1997; 1015-1020 m depth.
DISTRIBUTION AND SYMPATRY. — The species is at present known from the South Pacific Ocean, at Marquesas (Eiao Island and Fatu Hiva Island), with only empty shells collected in 627-1250 m depth (Fig. 25F).
Benthonellania lozoueti n. sp. is sympatric with Benthonella boucheti n. sp. at the Marquesas (Fatu Hiva Island); with Benthonellania megan n. sp. at the Marquesas (Fatu Hiva Island) (Table 2).
ETYMOLOGY. — This species is named after Pierre Lozouet (MNHN, Paris) for his contribution to Malacology, including his work on Benthonella and Benthonellania.
DESCRIPTION OF HOLOTYPE
Shell (Figs 21 A-C; 22E-I)
Large for the genus, height 3.86 mm, width 2.6 mm, height/ width ratio 1.484, pretty solid, ovate-conical.
Protoconch (Fig. 22 F-H)
Multispiral, of 2 whorls, height 0.35 mm, nucleus diameter 0.10 mm, first half whorl diameter 0.175 mm, maximum diameter 0.412 mm; protoconch I with only microtubercles, some spirally arranged (Fig. 22G), protoconch II with three zig-zag spiral cordlets on upper part; inferiorly a fourth spiral cord. In the second half of the whorl, numerous microstructures often welded between them (Fig. 22F, H). Protoconchteleoconch boundary barely visible.
Teleoconch
Of 4 convex whorls, suture canaliculate, crowned by small tubercles at tips of axial ribs, highlighted by a subsutural spiral groove. Height last whorl 2.8 mm. height/height last whorl ratio 1.378. Axial sculpture of 26 curved and opisthocline ribs on last whorl, narrower than interspaces, gradually vanishing towards the base. Spiral sculpture of 7 (last one barely visible) weak fine cordlets on the base, uppermost one, suprasutural, visible on all whorls. Weak bulges at intersections with axial ribs. Microsculpture of only growth striae (Fig. 22I). Umbilical chink present. Aperture pyriform, large, height 1.75 mm, height/height aperture ratio 2.205, peristome continuous, outer lip broken. Columella arcuate, simple.
Colour
Coloration of teleoconch translucent white, protoconch whitish.
Operculum and soft parts
Unknown.
VARIABILITY
Species not very variable (See Table 1 and Appendix 13).
REMARKS
All the examined specimens have a broken peristome (presence/absence of lip thickening not observable).
B. lozoueti n. sp. differs from B. tuamotu n. sp. by the presence of weak thickenings at the intersections of the spiral cordlets with the axial ribs, absent in B. tuamotu n. sp.; B. lozoueti n. sp. has a slightly convex base vs slightly concave in B. tuamotu n. sp. and on average has more numerous and finer axial ribs (22.4 vs 17.5 in B. tuamotu n. sp.).
description: Published as part of Amati, Bruno, Giulio, Andrea Di & Oliverio, Marco, 2022, Deep-water Rissoidae of the genera Benthonella Dall, 1889 and Benthonellania Lozouet, 1990 (Gastropoda, Caenogastropoda, Rissooidea) from French Polynesia, pp. 335-389 in Zoosystema 44 (12) on pages 370-373, DOI: 10.5252/zoosystema2022v44a12, http://zenodo.org/record/6794846