Instituto de Fisiografía y Geología

Facultad de Ciencias Exactas, Ingeniería y Agrimensura

Universidad Nacional de Rosario

Pellegrini 250, 2000 Rosario, Argentina

Correo-e: ifg@fceia.unr.edu.ar

 

 

Boletín del Instituto de Fisiografía y Geología

ISSN 1666-115X

 

 

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Año 2018 - Volumen 88

 

 

The occipital region of late Pleistocene Mylodontidae of Argentina

 

Brambilla L. & Ibarra D.A.

 

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In deposits of the late Pleistocene of Argentina the remains of ground sloths (Xenarthra, Folivora) are frequently represented by crania in which only the posterior region is preserved. In this work we characterize the occipital region of late Pleistocene Mylodontidae to allow a taxonomic identification of fragmentary specimens of Lestodon armatus, Mylodon darwinii, Glossotherium robustum and Scelidotherium leptocephalum. The available juvenile specimens were also included in this study and the ontogenetic shape changes are described. Additionally, the signs in the occipital region that allow the identification of juvenile specimens are discussed. The mylodontids G. robustum and M. darwinii have a significant variability in the occipital region which could be explained by sexual differences, or well as a result of palaeoenvironmental changes that took place during the Lujanian.

 

Luciano Brambilla [lbrambilla@fbioyf.unr.edu.ar]: Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina & Facultad de Ciencias Exactas, Ingeniería y Agrimensura, UNR, Pellegrini 250, 2000 Rosario, Argentina.


Damián A. Ibarra: Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, Argentina.

 

 

A new species of the ammonite genus Physodoceras Hyatt (Aspidoceratidae) from the Hybonotum Zone (Lower Tithonian) of Southern Germany, with comments on the phylogeny of the genus

 

Scherzinger A., Parent H. & Schweigert G.

 

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We here introduce a new species of the aspidoceratid genus Physodoceras, P. widerai n. sp., the corresponding microconchs of which are represented by Sutneria eugyra Barthel. The Physodoceras succession of the upper Kimmeridgian (Pseudomutabilis to Beckeri zones) to Lower Tithonian (Hybonotum to Ciliata zones) is summarized. Lectotypes are designated for Perisphinctes casimirianus Fontannes, Aspidoceras episoides Fontannes, Ammonites hoplisus Oppel, and Ammonites aporus Oppel.


Armin Scherzinger [Armin.Scherzinger@t-online.de]: Maurenstraße 26, 78194 Immendingen-Hattingen, Germany.


Horacio Parent [parent@fceia.unr.edu.ar]: Laboratorio de Paleontología, IFG, FCEIA, Universidad Nacional de Rosario, Pellegrini 250, 2000 Rosario, Argentina.

 

Günter Schweigert [guenter.schweigert@smns-bw.de]: Staatliches Museum für Naturkunde, Rosenstein 1, 70191 Stuttgart, Germany.

 

 

 

Tithonian (Internispinosum Zone) ammonites from Cordón de Cuchillo Cura, Neuquén Basin, Argentina

 

Parent H., Garrido A.C., Scherzinger A. & Schweigert G.

 

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A small collection of ammonites from the outcrops of the Los Catutos Member (Vaca Muerta Formation) in Cuchillo Curá indicates a stratigraphic position in the upper Internispinosum Zone. This ammonite assemblage is composed of Cieneguiticeras aff. falculatum (Steuer), Lingulaticeras sp. A, Haploceratoidea indet. (lamellaptychus), Choicensisphinctes sp. A, Zapalia triplex (Zeiss & Leanza), Catutosphinctes cf. inflatus (Leanza), Catutosphinctes sp. A, Parodontoceras cf. calistoides (Behrendsen), Aspidoceras euomphalum (Steuer), Toulisphinctes cf. rafaeli (Oppel), and Windhauseniceras internispinsoum (Krantz).
The record of C. aff. falculatum in the studied outcrop extends the stratigraphic range of the genus, which thus spans from the lowermost Tithonian Picunleufuense Zone up to the upper Internispinosum Zone. P. cf. calistoides is the oldest known record for the genus Parodontoceras.

 

Horacio Parent [parent@fceia.unr.edu.ar]: Laboratorio de Paleontología, IFG, FCEIA, Universidad Nacional de Rosario, Pellegrini 250, 2000 Rosario, Argentina.


Alberto C. Garrido [albertocarlosgarrido@gmail.com]: Museo Provincial de Ciencias Naturales “Prof. Dr. Juan A. Olsacher”, Dirección Provincial de Minería, 8340 Zapala, Argentina | Departamento Geología y Petróleo, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, 8300 Neuquén, Argentina.
 

Armin Scherzinger [Armin.Scherzinger@t-online.de]: Maurenstraße 26, 78194 Immendingen-Hattingen, Germany.
 

Günter Schweigert [guenter.schweigert@smns-bw.de]: Staatliches Museum für Naturkunde, Rosenstein 1, 70191 Stuttgart, Germany.

 

 
 
 
 

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