Leptinaria spec.

Miquel, Sergio E. & Jaime, Giselle L., 2018, Subulinidae snails from northern Argentina with description of a new species of Nannobeliscus Weyrauch, add _ journal _ name _ here 41 (1), pp. 1-7 : 6

Leptinaria spec.

Figs 1 , 10, 11

Description

Shell small, less than 4 mm, conical, perforate, solid; shell with 5 convex whorls of rapid growth with sculpture of strong axial ribs (around 45 in last whorl), disposed in regular intervals in all whorls, somewhat separated with visible growth lines between them; last whorl occupies more than 50 % of total length; sutures marked; aperture slightly oblique and oval; outer lip thin; columella not truncate with oblique and weak fold; columellar margin reflected and turning over the small and not perspective umbilicus; yellowish periostracum; protoconch smooth of two whorls.

Measurements (in mm): MACN-In 39.380: 3.65 × 2.10 mm; aperture: 1.95 × 1.45 mm; whorls: 4 1 / 2. MACN-In 39.381: 3.80 × 2.20 mm; aperture: 1.80 × 1.30 mm; 5 whorls.

Distribution in Argentina: Jujuy and Misiones provinces.

Comparisons. Similar species to Leptinaria spec. have been reported in many areas of America. Leptinaria mamoreensis Baker, 1926 from Venezuela and Brazil, differs in the lack of columellar fold and the existence of arcquated upper angle in the outer lip, weakly reflected to the aperture (Baker 1927, Simone 2006); from Honduras is known Leptinaria mexicana utilensis Pilsbry, 1907 differing in bigger size and sculpture of irregular and tight axial ribs. The samples MACN-In 371 and MACN-In 8.848-1 were determined by Hylton Scott – in schedula – as Subulina bacterionides , although published as Leptinaria bacterionides (Hylton Scott, 1948) , species recorded in Bolivia and in the north of Argentina ( Fig. 1 ), of similar aspect to Nannobeliscus mariaisabelae . L. bacterionides shows an internal columellar fold that gives truncate appearance, and radular formula is 14+ 6 +1 +6 + 14 (Fig. 9).

Material examined ( dry): ARGENTINA: MACN-In 39.380, Iguazú National Park, Misiones, Col. M. J. Ramírez, 8-15-II-1995, 1 ex.; MACN-In 39.381, Calilegua National Park , Jujuy, Leg. L. Pereira, 30-XI-1986, Col. A. Rodrigues Capítulo, 1 ex.; L. bacterionides : NHMUK Reg. 1854.12.4.88, Laguna, Bolivia, Lectotype (photograph).

Figures

Fig. 1. Distribution of Nannobeliscus mariaisabelae spec. nov. (%), Leptinaria spec. (×) and L. bacterionides (d’Orb., 1835) (&).