Aclis corniculata Souza & Araújo & Pimenta 2024, sp. nov.
Creators: name: Souza, Leonardo Santos De
name: Araújo, Tarciso Almeida De
name: Pimenta, Alexandre Dias
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Eulimidae
Aclis
Aclis corniculata

description: Aclis corniculata sp. nov.
Fig. 10
Type material: Holotype. MNRJ 33425 [†]; R/ V Ocean Stalwart coll., 17/vii/2009.
Paratypes. Brazil: Rio de Janeiro state: HAB 17 sta. E2. MNRJ 34073 [1†].
Type locality. Brazil: Rio de Janeiro state; Campos Basin, HAB11 sta. E2 (22°06′52″, 40°39′06″, 53 m).
Material examined. The types and: Brazil: Rio de Janeiro state: HAB 11 sta. E2; MNRJ 16934 [1†]; São Paulo state: off São Sebastião Island; 24°12′45″S, 44°59 ″W, 79 m; R/ V Professor Wladimir Besnard col., xi/1997; MNRJ 36009 [2†]; MZSP 89179 [1†].
Etymology. The epithet means horn-shaped, a Latin singular adjective in the nominative case and refers to the shell shape.
Description. Shell tall, subcylindrical, reaching about 2.9 mm long, 0.9 mm wide, eight whorls. Protoconch globose, subcylindrical, nucleus elevated, about 1.75 whorls, surface smooth. Teleoconch with convex whorls, surface glossy presenting faint microscopical spiral striae and strong incremental scars with irregular intervals. Body whorl about half the total length, base rounded; aperture short, elliptical in shape, about 65% of body whorl length, slightly expanded laterally, rounded anteriorly, acute posteriorly; outer lip thin, almost orthocline, slightly advanced at distal area; inner lip thin, reflected. Umbilicus lacking.
Measurements. Holotype, MNRJ 33425: 7 whorls; SL= 2.9 mm; BWL= 1.3 mm; AL= 0.7 mm; SW= 0.9 mm; AW= 0.5 mm. Paratype, MNRJ 34073: 7 whorls; SL= 2.9 mm; BWL= 1.5 mm; AL= 0.6 mm; SW= 0.7 mm; AW= 0.4 mm. MNRJ 36009: 7 whorls; SL= 2.6 mm; BWL= 1.1 mm; AL= 0.6 mm; SW= 0.8 mm; AW= 0.4 mm.
Remarks. Aclis corniculata sp. nov. is noticeably different from most of his congeners because this newly described species has a subcylindrical shape, lack of spiral keels, a small aperture and straight outer lip. Other specific features can be mentioned to distinguish the present species.
Aclis corniculata sp. nov. differs from A. sarissa (Figs 2–3) by the more acute spire angle, narrower and shorter aperture, narrower umbilical fissure, straighter outer lip and by having no trace of spiral keels.
Aclis corniculata sp. nov. differs from A. pulchra sp. nov. (Figs 7–8) by having a narrower aperture anteriorly, lacking a flattened expansion, and an orthocline or slightly prosocline outer lip, which is strongly opisthocline in A. pulchra sp. nov. Moreover, A. corniculata has a small umbilical fissure while A. pulchra sp. nov. has a broader umbilicus.
Geographic Distribution. Brazil: Rio de Janeiro, São Paulo. From 53 m to 79 m.
description: Published as part of Souza, Leonardo Santos De, Araújo, Tarciso Almeida De & Pimenta, Alexandre Dias, 2024, Taxonomic review of Aclis Lóven, 1846 (Gastropoda, Eulimidae) from Brazil with notes on other congeners from the western Atlantic and Saint Helena, pp. 451-499 in Zootaxa 5433 (4) on page 469, DOI: 10.11646/zootaxa.5433.4.1, http://zenodo.org/record/10954420