Globularia cf. catanlilensis ( Weaver, 1931 )

Ferrari, S. Mariel, 2013, New Early Jurassic gastropods from west-central Patagonia, Argentina, Acta Palaeontologica Polonica 58 (3), pp. 579-593 : 587-588

Globularia cf. catanlilensis ( Weaver, 1931)

Figs. 3H , 4A–C .

1934 Natica aff. catanlilensis ; Feruglio 1934: 49, pl. 5: 2a, b, 3a, b. 1942 Natica catanlilensis ; Wahnish 1942: 61, pl. 2: 1a, b.

Material.— MPEF−PI 4110 to 4119, MLP 18512 and 18513; fragmentary and re−crystallized teleoconchs. LO 29 site from Lomas Occidentales locality; LT s and LT 1 sites from Cerro La Trampa locality, Chubut province, Argentina, Mulanguiñeu Formation , Upper Pliensbachian–Lower Toarcian, Lower Jurassic .

Dimensions.—See Table 2. Description.—Dextral, anomphalous, globular, naticiform, low spired and medium to large sized shell. The protoconch is not preserved. The teleoconch comprises five whorls; the last teleoconch whorl is much higher than the spire. Last whorl aproximately as high as wide. The spire is blunt, acute; the upper portion of the whorls is flat with a sutural ramp of 4 mm wide, becoming strongly convex toward the lower portion. Sutures are deeply incised. The shell is smooth or lacks a well developed ornament; some specimens have weak spiral keels on last teleoconch whorl, and growth lines are not developed. The base is strongly convex and the aperture oval; the aperture has a narrow adapical end becoming wider toward the abapical end. The outer lip is convex, and the inner lip concave with an embedded callus. Umbilical characters are absent.

Remarks.—The globular, naticiform, low spired and convex shell, smooth or with weak spiral keels, and the closed umbilical area suggest an assignment to Globularia .

http://dx.doi.org/10.4202/app.2011.0090

The material here analyzed agrees with the descriptions of Natica catanlilensis ( Weaver 1931: 378, pl. 42: 277–278) from the Early Jurassic of Neuquén province ( Argentina), with Natica aff. catanlilensis ( Feruglio 1934: 49, pl. 5: 2a, b, 3a, b) and with Natica catanlilensis ( Wahnish 1942: 61, pl. 2: 1a, b), the last two recorded from the Early Jurassic of Chubut province, Argentina. Here, I decide to include the material described by these authors into the genus Globularia (see above), and to keep the open nomenclature suggested by Feruglio (1934), until more and better preserved material is available.

Globularia khadirensis Szabó and Jaitly (2004: 18 , pl. 2: 17–19, 22, 23) from the Bathonian (Middle Jurassic) of India resembles G. cf. catanlilensis ; but the former species has a larger shell, with a more step−like sutural ramp, an axial furrow bordering the inner lip and a false umbilicus. The material described by Szabó and Jaitly (2004: 18, pl. 2: 11–13) as Globularia michelini (d’Archiac, 1843) from the Callovian (Middle Jurassic) of India differs from the Patagonian species in having a parietal lip forming a narrow callus on the base, and a slightly reflected columellar lip. Globularia hemisphaerica (Roemer, 1836) ( Cox 1965: 166, pl. 28: 9) from the Upper Jurassic of Kenya differs from the species here described in having a more globular shell, with a lower and more convex spire; the last teleoconch whorl is larger and more convex; moreover, it has weak collabral lines. Globularia phasianelloides (d’Orbigny, 1852) ( Cox 1965: 166, pl. 29: 1a, b) from the Oxfordian–Kimmeridgian (Upper Jurassic) of Kenya has a higher spire than the Chubutean species, with slightly convex whorls. Globularia hennigi Cox (1965: 167 , pl. 28: 5a–c) from the Upper Jurassic of Kenya differs from G. cf. catanlilensis in being smaller and having prosocline growth lines. Ampullospira quennelli Cox (1965: 165 , pl. 29: 2 a–c, 3a–c) from the Callovian (Middle Jurassic) of Tanzania is very similar to the species here described; however, the spire whorls of the African species are more convex and it has a concave sutural edge as well as and slightly opisthocline growth lines. Natica proxima Hudleston, 1882 (1877–1896: 260, pl. 20: 7) from the Middle Jurassic of England differs from the Patagonian species in having a distinctive umbilical area with a callus developed in the inner lip. Natica adducta Phillips, 1829 (Hudleston 1877–1896: 257, pl. 20: 3) from the Middle Jurassic of England resembles G. cf. catanlilensis ; but the European species is smaller than the Chubutean species and has fine growth lines on the shell surface.

Stratigraphic and geographic range.— Early Jurassic; Andean region of Argentina, Neuquén and Chubut provinces .

Figures

Fig. 3. Early Jurassic gastropods from Lomas Occidentales fossil locality. A–D. Pseudomelania feruglioi sp. nov. A. MPEF−PI 4090, paratype, adult teleoconch in lateral views (A1, A2). B. MPEF−PI 4091, paratype, adult teleoconch in lateral view. C. MPEF−PI 4096, juvenile teleoconch in lateral view. D. MPEF−PI 4089, paratype, adult teleoconch in apertural views (D1, D2). E. Pseudomelania sp. adult teleoconch in lateral views (E1, E2), basal views showing ornament details (E3, E4). F, G. Anulifera chubutensis sp. nov. F. SEGEMAR 25000 (MPEF−PI 4107), holotype, teleoconch in lateral (F1) and apertural (F2) views. G. SEGEMAR 25001 (MPEF−PI 4108), fragmentary teleoconch in lateral views (G1, G2). H. Globularia aff. catanlilensis (Weaver, 1931). MPEF−PI 4110, teleoconch in lateral (H1) and apertural (H2) views. Scale bars: A–E 3 mm, F–H, 10 mm.

Fig. 4. Early Jurassic gastropods from Lomas Occidentales and Cerro La Trampa fossiliferous localities.A–C. Globularia cf. catanlilensis (Weaver, 1931). A. MPEF−PI 4112; teleoconch in lateral (A1, A2) and apertural (A3) views. B. MPEF−PI 4114; teleoconch in lateral (B1, B2) and latero−apical (B3) views. C. MPEF−PI 4116, teleoconch in lateral views (C1, C2). D. Globularia sp. MPEF−PI 4119; teleoconch in lateral (D1) and apertural (D2) views. E. Naricopsina? sp.; MPEF−PI 3560, teleoconch in latero−apical views (E1, E2). F. Nerinea? sp. 1. MPEF−PI 4123, fragmentary teleoconch in lateral views (F1, F2). G–I. Nerinea? sp. 2. G. MPEF−PI 4124, fragmentary teleoconch in lateral view. H. MPEF−PI 4125, fragmentary teleoconch in lateral view. I. MPEF−PI 4126, fragment of last teleoconch whorl in lateral view. Scale bars: A–D 10 mm, E–I 3 mm.