Laevilitorina magellanica Gonzalez-Wevar & Rosenfeld
Creators: name: Rosenfeld, Sebastián
name: Segovia, Nicolás I
name: Maturana, Claudia S
name: Aldea, Cristián
name: Saucède, Thomas
name: Brickle, Paul
name: Spencer, Hamish G
name: Poulin, Elie
name: González-Wevar, Claudio A
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Littorinidae
Laevilitorina
Laevilitorina magellanica

description: Laevilitorina magellanicaGonzález-Wevar & Rosenfeld
sp.nov.
(Fig. 2)
Laevilitorina caliginosa – Ríos and Gerdes 1997: 51; Mutschke et al. 1998: 13; Ingólfsson 2005: 176; Rosenfeld et al. 2018: 9.
Laevilitorina caliginosa L1 – González-Wevar et al. 2022: 1527.
-75 -70 -65 -60 -55 Longitude
Zoobank registration: zoobank.org:act:BF37AA2E-2ADB-45F9-8EDA-6EAEA4B479A5.
Holotype: MNHNCL MOL-205424, ~ 25 km north of Punta Arenas (− 52.987406°S, − 70.812342°W), Strait of Magellan, Chile, 21 June 2015, collected by Claudio González-Wevar and Sebastián Rosenfeld.
Paratypes: MNHNCL MOL-205425; MNHNCL MOL-205426; MNHNCL MOL-205427; MNHNCL MOL-205428.
Description
Shell: Small (maximum height 4.03 mm), typical Laevilitorina morphology: fusiform with rounded to almost straight whorls, suture impressed, concave spire profile, apex blunt. Aperture rounded, slightly ovoid and ≤ 54% of total H (Fig. 2A–C). Macroscopic spiral and axial sculpture absent. Multiple fine growth lines over whole shell. Columella smooth, inner lip barely reflected over narrow and shallow umbilicus; outer lip thin, simple; no evidence of thickening. Colour variable: reddish to dark or olive brown, often with small white spots, irregular in size and position. Operculum corneous. Mature H 3.01– 4.06 mm (H/B = 1.25–1.53, SH = 1.77–2.01) (Supporting Information, Table S1).
External anatomy: Ventral area of foot orange, cephalic area black.
Radula: Rachidian: seven cusps, central cusp rounded, longest, in some cases with small denticles at end (Fig. 2D). First pair of flanking cusps pointed, about half size of central cusp; outer cusps smaller, also pointed. Lateral: six or seven cusps, main cusp more rounded with denticulate end, accompanied by two pointed outer cusps and three or four inner ones (Fig. 2E). Inner marginal: six or seven cusps, pointed and of similar size, except for broader main cusp, which terminates with denticulate end (Fig. 2F). Outer marginal: nine thin and pointed cusps.
Holotype dimensions: Length 3.19 mm, width 2.34 mm.
Depositories: Holotype MNHNCL MOL-205424. Museo Nacional de Historia Natural, Chile.
Type locality: Chabunco (52°59 ʹ 14.66″S, 70°48 ʹ 44.43″W), Strait of Magellan, Chile (Fig. 2G).
Habitat: Rocky intertidal shores of the central micro-basin of the Strait of Magellan. Laevilitorina magellanica is commonly found in rock crevices, underneath boulders and/or also on the beds of the mytilid Perumytilus purpuratus (Lamarck, 1819).
Materialstudied: FaroSanIsidro,StraitofMagellan(− 53.785572°S, − 70.973522°W), n = 30; Port Famine, Strait of Magellan (− 53.609464°S, − 70.931500°W), n = 80; Punta Carrera, Strait of Magellan (− 53.586367°S, − 70.923372°W), n = 50; Leñadura, Strait of Magellan (− 53.213428°S, − 70.938350°W), n = 50; Chabunco (− 52.987496°S, − 70.812342°W), n> 100; Possession Bay (− 52.232083°S, − 69.297419°W), n = 20 (Fig. 2G).
Etymology: The type locality of this species is the Strait of Magellan.
Remarks: In general, owing to the significant morphological plasticity recorded in the nominal species L. caliginosa (Reid 1989; Engl 2012), this new species was previously reported from the Strait of Magellan as L. caliginosa. Nevertheless, in terms of morphology, this new Laevilitorina species is characterized by its small size. In contrast to L. caliginosa and L. fueguina, which exceed 5 mm in shell height, the maximum size of L. magellanica does not exceed 4.10 mm. Moreover, L. magellanica differs from L. fueguina by having a larger spire size and slightly more convex whorls and differs from L. caliginosa by having a larger aperture length. Moreover, L. magellanica differs from other Antarctic and sub-Antarctic Laevilitorina in having denticles on the main cusps of the lateral and inner marginal teeth (Fig. 2E, F).
description: Published as part of Rosenfeld, Sebastián, Segovia, Nicolás I, Maturana, Claudia S, Aldea, Cristián, Saucède, Thomas, Brickle, Paul, Spencer, Hamish G, Poulin, Elie & González-Wevar, Claudio A, 2023, A revision of the higher latitude periwinkle species Laevilitorina caliginosa sensu lato, pp. 1-18 in Zoological Journal of the Linnean Society 202 (1) on pages 3-6, DOI: 10.1093/zoolinnean/zlad171, http://zenodo.org/record/14360770