Finding of Systrophia (S.) argentina n. comb. in the Argentine Precordillera a century and a half after its description (Mollusca: Gastropoda: Scolodontoidea)

Sergio Miquel

doi:10.22179/revmacn.22.677

Abstract

Systrophia (Systrophia) argentina (Strobel, 1874) n. comb. is here re-described 150 years after its discovery. The specimens were found in the Argentine Precordillera (Quebrada San Isidro, Mendoza province, Argentina), at 2.000 m, near the typical locality of the species, here restricted to the Angostura or garganta (gullet) of Villa Vicencio and Casa de Piedra. This snail has a shell of medium size, planispiral, with six whorls; radula with central plate tricuspid, and latero-marginal teeth aculeate, formula: 13 – C – 13; genital tracts very long; vagina short, spermathecal duct reaching the distal extreme of the vagina, near the atrium; penial sheath long, with some circumvolutions, penis occupying most of the penial sheath, deferent duct penetrating laterally at the base of the penis, epiphallus with a retractor muscle adhered to its extreme, large and quadrangular gland attached to the penial sheath; atrium very short. S. (S.) argentina is the only species of the genus Systrophia L. Pfeiffer, 1855 so far found in Argentina.

Highlights

In 1868, Pellegrino Strobel wrote his first comments about the continental mollusks of the Argentine Precordillera of Mendoza province
The specimens were housed in the Invertebrates Division of the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (MACN-In), Buenos Aires, Argentina
Planispiral, 5- 6 whorls, protoconch with almost 2 whorls; radula with teeth aculeate, formula: 13 – C – 13; vagina and atrium short; spermathecal duct reaching the distal extreme of the vagina; penial sheath with some circumvolutions; penis occupying most of the penial sheath; large and quadrangular gland (“penial gland”) attached to the distal extreme of the penial sheath

Summary

Introduction

In 1868, Pellegrino Strobel wrote his first comments about the continental mollusks of the Argentine Precordillera of Mendoza province. A few years later, in the same area, the author described a new species of Scolodontidae H.B. Baker, 1925, Hyalina (Ammonoceras) argentina Strobel, 1874, classified as Streptaxidae Gray, 1860.

Results

Conclusion