Sergio Bogan

First fossil record of amiid fishes (Halecomorphi, Amiiformes, Amiidae) from the Late Cretaceous of Uberaba, Minas Gerais State, Brazil

Martinelli, A.G., Bogan, S., Agnolin, F.L., Ribeiro, L.C.B., Cavellani, C.L., Ferraz, M.L.F. & Teixeira, V.P.A., iFirst article. First fossil record of amiid fishes (Halecomorphi, Amiiformes, Amiidae) from the Late Cretaceous of Uberaba, Minas Gerais State, Brazil. Alcheringa, 1–9. ISSN 0311-5518. The first fossil amiid fishes (Halecomorphi, Amiiformes) from the Late Cretaceous Marília Formation (Bauru Group) at Uberaba County, Triângulo Mineiro region (Minas Gerais State, Brazil), are described. The material includes some partial maxillae, a dermopterotic, a cleithrum, several vertebral centra and teeth. Features such as the absence of a supramaxillary notch on the dorsal edge of the maxilla, a wide and deep pit on the maxilla for the articulation of the premaxilla, anterior portion of the maxilla with a sub-circular cross-section, teeth with acrodine cup with strong mesial and distal keels, among others, permit confident referral of the material to the Subfamily Vidalamiine (Amiidae), previously recognized in Lower Cretaceous strata of northeasthern Brazil. These specimens constitute the first Late Cretaceous record of this group in Brazil and one of the few in South America. Agustín G. Martinelli [agustín_martinelli@yahoo.com.ar], Centro de Pesquisas Paleontológicas Llewellyn Ivor Price, Complexo Cultural e Científico Peirópolis (CCCP/UFTM), BR-262, Km 784, Bairro Peirópolis, Uberaba, Minas Gerais, Brazil; Sergio Bogan [sergiobogan@yahoo.com.ar], Fundación de Historia Natural ‘Félix de Azara’, Departamento de Ciencias Naturales y Antropología, CEBBAD—Universidad Maimónides, Hidalgo 775 piso 7 (1405BDB), Buenos Aires, Argentina. Federico Agnolín* [fedeagnolin@yahoo.com.ar], Sección Paleontología de Vertebrados, Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Av. Ángel Gallardo 470 (C1405BDB), Buenos Aires, Argentina. Luiz Carlos Borges Ribeiro [lcbrmg@terra.com.br], Camila Lourencini Cavellani [camila@patge.uftm.edu.br], Mara Lúcia da Fonseca Ferraz [mara@patge.uftm.edu.br] and Vicente de Paula Antunes Teixeira [vicente@patge.uftm.edu.br], Centro de Pesquisas Paleontológicas Llewellyn Ivor Price, Complexo Cultural e Científico Peirópolis (CCCP/UFTM), BR-262, Km 784, Bairro Peirópolis, Uberaba, Minas Gerais, Brazil. *Also affiliated with: Fundación de Historia Natural ‘Félix de Azara’, Departamento de Ciencias Naturales y Antropología, CEBBAD—Universidad Maimónides, Valentín Virasoro 732 (C1405BDB), Buenos Aires, Argentina. Received 15.4.2012; revised 11.6.2012; accepted 20.6.2012.

Primera ictiofauna marina del Cretácico Superior (Formación Jaguel, Maastrichtiano) de la provincia de Río Negro, Argentina

Se describe un conjunto de dientes fosiles que proceden de sedimentos marinos de la Formacion Jaguel (Maastrichtiano), de la localidad de Bajo Trapalco, provincia de Rio Negro, Patagonia, Argentina. La ictiofauna aqui descripta es la primera para la Formacion y se compone de unos seis taxones diferentes de Chondrichthyes (Serratolamna serrata, Squalicorax pristodontus, Cretalamna appendiculata, Carcharias sp., Odontaspis sp. y cf. Pseudohypolophus mcnultyi) y dos Teleostei del genero Enchodus (aff. E. ferox y aff. E. gladiolus). Serratolamna serrata es el taxon mejor representado del conjunto, y constituye la cita mas austral conocida en la distribucion de esta especie y el primer registro fosil para Argentina. Los registros de Enchodus, Squalicorax pristodontus y cf. Pseudohypolophus mcnultyi, representan las primeras descripciones de estos taxones para Argentina. Todos los taxones descriptos constituyen un ensamblaje de especies que caracterizan las paleoictiofaunas de los mares del Cretacico Superior de distintas partes del globo, aportando novedosa informacion para la comprension de las ictiofaunas Mesozoicas del cono sur sudamericano.

Descripción de una nueva especie de bagre marino fósil (Teleostei, Siluriformes, Ariidae) del Mioceno de la provincia de Río Negro, Argentina

En este trabajo se describen dos craneos de la familia Ariidae procedentes del miembro Saladar de la Formacion Gran Bajo del Gualicho, ubicados en las Salinas del Gualicho, provincia de Rio Negro, Argentina. La edad de los depositos del Miembro Saladar se remonta al Mioceno Temprano alto/Mioceno Medio bajo. Los materiales son asignados a una nueva especie extinta del genero viviente Genidens. Este nuevo taxon se distingue de todas las especies actuales por presentar un proceso supraoccipital muy corto, ancho y redondeado, extraescapular subcircular y mesetmoides amplios con una conspicua escotadura mesial, frontales practicamente planos en vista lateral y margen lateral de los huesos esfenoticos rectilineo. Genidens sp. nov., representa el registro mas antiguo para el genero y constituiria una especie de aspecto similar a las formas actuales del genero. sp. nov., representa el registro mas antiguo para el genero y constituiria una especie de aspecto similar a las formas actuales del genero.

Primer registro fósil de la familia Trichomycteridae (Teleostei: Siluriformes; Plioceno) en la Formación Monte Hermoso, Argentina

First fossil record for the family Trichomycteridae (Teleostei: Siluriformes; Pliocene) in the Monte Hermoso Formation, Argentina. Some fossil remains referable to the siluriform family Trichomycteridae are described in this paper. These specimens exhibit a combination of characters that allow to include them within the subfamily Trichomycterinae. These elements consist on an opercular and interopercular of the same individual, collected in Lower-Middle Pliocene beds of the Monte Hermoso Formation, at the Farola de Monte Hermoso locality, Buenos Aires province, Argentina. This record constitutes the first fossil remains reported for the family, and one of the few paleoichthyological records for the Monte Hermoso Formation.

A new lungfish (Dipnoi) from the Late Triassic of South America

http://zoobank.org/urn:lsid:zoobank.org:pub:69F156B4-1A84-4C98-86C3-4FE4626024AC Citation for this article: Agnolín, F. L., S. Bogan, F. Brissón Egli, F. E. Novas, M. P. Isasi, C. Marsicano, A. Zavattieri, and A. Mancuso. 2016. A new lungfish (Dipnoi) from the Late Triassic of South America. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2017.1245665.

New selachian records from the Upper Cretaceous of southern Patagonia: paleobiogeographical implications and the description of a new taxon

ABSTRACT We describe isolated shark teeth collected in levels of the Calafate Formation (Maastrichtian, Late Cretaceous) on the southeast coast of Argentino Lake, Calafate City, Santa Cruz Province, Argentina. The teeth belong to the hexanchiform Notidanodon dentatus, a new species of the squaliform Protosqualus, and an indeterminate species of the echinorhiniform genus Echinorhinus. The record of Notidanodon constitutes the first in South America. The report of Notidanodon associated with plesiosaur remains is in accordance with previous records from around the world. Protosqualus argentinensis, nov. sp., which is the first record of the genus in South America, is characterized by having teeth with a apicobasally tall root and serrated cutting edges, among other features. Echinorhinus sp. constitutes one of the oldest records of this genus on the continent and one of the few Mesozoic records worldwide. This shark association is clearly distinct from coeval selachian faunas from northern Patagonia, which exhibit clear Tethyan influences. Instead, it shows some similarities to other high-latitude selachian faunas, including Australia, New Zealand, and Antarctica. It is possible that the Cretaceous selachian assemblages of Patagonia may be separated into two different associations: northern Patagonian faunas are related to more temperate associations of lower paleolatitudes, whereas those of southern Patagonia are closer to other southern localities.

Primer registro de Synbranchiformes (Teleostei) para el Holoceno temprano de Argentina

First record of Symbranchiformes (Teleostei) from the early Holocene of Argentina. In this contribution we present and describe the remains of the bony fish cf. Synbranchus, exhumed from fossiliferous levels of the Rio Bermejo Formation, Mansilla, southeastern Formosa province, Argentina. These materials constitute the only fish remains exhumed in this area, and they were found in association with extinct mammals which are characteristic of the Late Pleistocene and Early Holocene. Until now, only few fossil remains of Synbranchidae were known in South America. The earliest records come from the lowermost section of the Upper Pleistocene (“Belgranense”) from the Pampean region, Buenos Aires, Argentina. The materials coming from the Rio Bermejo Formation represent the first fossil record of a Synbranchidae cf. Synbranchus from the Early Holocene.

First fossil records of silversides (Teleostei: Atheriniformes) from the Middle Pleistocene of Buenos Aires province, Argentina

First fossil records of silversides (Teleostei: Atheriniformes) from the Middle Pleistocene of Buenos Aires province, Argentina. This paper presents the fossil remains of silversides recovered in sedimentary sequences corresponding to Centinela del Mar district Bonaerian Stage-Age (Middle Pleistocene), Buenos Aires province, Argentina. The few only previously described fossil silversides are restricted to three Chilean and Argentinean Miocene localities. The silversides studied here present several diagnostic osteological characters that allow us to refer the remains to the genus Odontesthes. These records give us new data on the composition of the pleistocenic ictiofaunas of Argentina, besides representing the first fossil records of silversides from the Pampean region.

Stranded humpback whale (Megaptera novaeangliae) (Cetacea: Balaenopteridae) in Paraná River Delta, Buenos Aires Province, Argentina. Comments on the occurrence of marine mammals in the La Plata River Basin

The humpback whale ( Megaptera novaeangliae ) is distributed among most oceans and seas of the globe (except Mediterranean Sea). These whales migrate from feeding regions in the Antarctic waters to breeding areas in tropical and subtropical seas. Here we report the stranding of a female young humpback whale, which was founded dead in the vicinity of the Talavera Island, in the Parana River Delta, Buenos Aires Province, Argentina. From the analysis of mitochondrial cytochrome c oxidase subunit I gene sequences, two novel haplotypes were found, totalizing four haplotypes described for the species. In the La Plata River Basin this species was found only twice at the end of the XIX century. Thus, the new finding constitutes an important addition to the list of cetaceans that occurs in Uruguay, Parana and La Plata Rivers.

Nuevo Percichthyidae (Teleostei, Percoidei) del Plioceno temprano de la provincia de Buenos Aires (Argentina) y sus implicancias biogeográficas

Fil: Agnolin, Federico. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina. Fundacion de Historia Natural Felix de Azara; Argentina