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The new rhynchonelliform brachiopod Chaniella pascuali n. gen. n. sp. is described from the lower Tremadocian Guayoc Chico Group of northwestern Argentina. Cladistic analysis shows that Chaniella is closest to the billingsellides Protambonites and Korinevskia. The particular combination of features of the new genus, in particular the presence of narrow lateral deltidial plates instead of a complete...
In this note we reassess the position of putative pedal phalanges of some South American noasaurid theropods (Abelisauroidea). Noasaurids were considered as to be distinctive abelisauroids with a peculiar “sickle claw” on the second toe of the foot, convergently developed with that of deinonychosaurians. Among noasaurids, the Argentinean species Noasaurus leali (latest Cretaceous) and Ligabueino andesi...
Panochthus subintermedius was originally named by Castellanos in 1933, without any diagnosis and no type material designated. In 1936, he briefly described and designated a holotype for this species (MACN-Pv 5130) and subsequently, in 1942, completed the description, but a diagnosis was still lacking. Some authors have considered this species as nomem nudum, but others have accepted its...
In this contribution we document the southernmost and probably the oldest record of the tribe Neuryurini (Glyptodontidae). The southernmost record of this tribe outside of Patagonia is Neuryurus sp. from Lujanian sediments (Luján Formation, late Pleistocene–early Holocene) at Quequén Grande River (Buenos Aires Province, Argentina). The first and only previous record of a specimen of the Neuryurini...
We report the discovery of an isolated avian carpometacarpus from the Upper Cretaceous Allen Formation (Campanian-Maastrichtian), Salitral Moreno, Río Negro Province, Argentina. This specimen is referred to cf. Neornithes because it presents a distinct but shallow infratrochlear fossa, a shortened ventral rim of the carpal trochlea that does not contact the base of the extensor process, and an extensor...
The Silurian genus Castellaroina and related leptostrophiids are reviewed and partially redescribed from the La Chilca, Los Espejos and Tambolar Formations of the Argentine Precordillera. The La Chilca Formation contains Eostropheodonta chilcaensis chilcaensis (Benedetto) and the new subspecies Eostropheodonta chilcaensis parvula of Rhuddanian and Aeronian–Telychian...
New species of Eoscarterellidae, Scytinopteridae, and Protopsyllidiidae are described from the Upper Triassic Potrerillos Formation, Cuyana Basin, Mendoza Province, Argentina. These specimens represent the first record of Eoscarterellidae and Sternorrhyncha in South America, as well as the first record of a scytinopterid hindwing from this continent. Their taxonomic positions are briefly discussed.
The extensive outcrops of the Late Jurassic–Early Cretaceous Vaca Muerta Formation black shales and marls in the Neuquén Basin have yielded very few bivalves, and these are not well known. The material described here was collected in central Neuquén, from late Tithonian calcareous levels within the black shales, between beds with Substeueroceras sp. and with Argentiniceras noduliferum (Steuer). The...
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