R234 AMEGHINIANA 48 (4) Suplemento 2011–RESÚMENES González-Rodríguez, K., and Schultze, H.-P. 2010. A fossil agonid (Actinopterygii, Teleostei Percomorphacea) from the Albian-Cenomanian of Mexico. In: K. González-Rodríguez and G. Arratia, (Comps.), Fifth International Meeting on Mesozoic Fishes. Global Diversity and Evolution. Museo del Desierto, Saltillo, Coahuila, México. Abstract Book and Field Guides, p. 50. “PHOLIDOPHORUS” ARGENTINUS DOLGOPOL DE SAEZ ,1939, AN ASPIDORHYNCHIDAE (ACTINOPTERYGII, ASPI- DORHYNCHIFORMES) FROM THE VACA MUERTA FORMATION (UPPER JURASSIC) OF NEUQUÉN PROVINCE, AR- GENTINA SOLEDAD GOUIRIC-CAVALLI and ALBERTO LUIS CIONE División Paleontología Vertebrados. Museo de La Plata. Universidad Nacional de La Plata. Paseo del Bosque S/N W1900FWA. Argentina - CONICET. sgouiric@fcnym.unlp.edu.ar; acione@fcnym.unlp.edu.ar he order Pholidophoriformes Berg, 1940, was erected on the basis of several characters that are considered primitive or incorrect today. Consequently, “pholidophoriforms” are not considered monophyletic. he “pholidophoriforms” included numerous genera and species around the world that range in age from the Triassic to Cretaceous. he genus Pholidophorus Agassiz, 1832, was created to include two species from the Triassic of Seefeld in Austria. Characters used to deine the genus included caudal in with nearly equal lobes, large rhomboid scales, general body shape, vertebral patterns, etc. what caused that the genus became a “catch all” diagnosed by plesiomorphic or invalid traits. Recently, Arratia (2000) studied the phylogenetic relationships of certain specimens previously assigned to Pholidophoriformes and the deinition of the genus Pholidophorus. In this study, she analyzed, among other characters, the structure of the scales of several Late Jurassic specimens from Germany. he author found some important diferences in the type, ornamentation, and structure of the scales. Several pu- tative “Pholidoforiformes” were reported from Argentina: “?Pholidophorus” dentatus Rusconi, 1946, and “Pholidophorus” vallejensis Rusconi, 1947, from the Triassic continental deposits of the Potrerillos Formation in Mendoza Province; Pholidophorus argentinus Dolgopol de Saez, 1939, from the Jurassic marine deposits of the Vaca Muerta Formation in Neuquén Province, and several “pholidophorids” indet. from the Cretaceous continental deposits of the La Cantera Formation in San Luis Province. he diverse Jurassic marine ish fauna from Argentina is currently under study by the irst author. As part of this study the holotype of “Pholidophorus argentinus” (housed in the La Plata Museum; MLP 39-VI-30-4) is redescribed. It consists of a caudal skeleton and posterior portion of the body preserved mainly as an impression. he study is based on the type material and a cast of this specimen. he distal part of the caudal rays are lost, some of them are not very well pre- served, and many are broken and disarticulated. Dolgopol de Saez assigned this specimen to the genus Pholidophorus based on a combination of characters that were posteriorly revised by one of us (AC) concluding that this specimen does not present any diagnostic character to be recognized as diferent species or even to allow an assignment to the genus Pholidophorus, assigning it instead to Halecomorphi indet. Our results reveal that the combination of structures such as number of basal fulcra, number of principal and precurrent [= procurrent] caudal rays, patterns of ramiication of rays, form and type of scales among others) clearly resemble those of aspidorhynchiforms and consequently we interpret this specimen as an aspidorhynchiform. Agassiz, L. 1832. Untersuchungen iber die fossilen Fische der Lias-Formation. Jahrbuch fuer Mineralogie, Geognosie, Geologie und Petrefaktenkunde 3: 139-149. Arratia, G. 2000. New teleosten ishes from the Jurassic of southern Germany and the systematic problems concernig the “pholidophoriforms”. Paläontolo- gische Zeitschrift 74: 113-143. Dolgopol de Saez, M. 1939. Noticias sobre peces fósiles argentinos. Notas del Museo de La Plata 2: 423-432. Rusconi, C. 1946. Nuevos peces triásicos de Mendoza. Anales de la Sociedad Cientíica Argentina 141: 148-153. Rusconi, C. 1947. Mas peces triásicos de Mendoza. Anales de la Sociedad Cientíica Argentina 143: 21-24. MARINE FISHES FROM THE EL MINISTERIO QUARRY, LOS CATUTOS MEMBER (UPPER JURASSIC, VACA MUERTA FORMATION), NEUQUEN BASIN, ARGENTINA. A PRELIMINARY TAPHONOMIC APPROACH SOLEDAD GOUIRIC-CAVALLI, DANIEL ALFREDO CABRERA and ALBERTO LUIS CIONE División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque S/N W1900FWA La Plata, Argentina - CONICET. sgouiric@fcnym.unlp.edu.ar; dcabrera@fcnym.unlp.edu.ar; acione@fcnym.unlp.edu.ar Los Catutos Member is a stratigraphic set composed by lithographic limestones interbedded with marls (rhythmites). At El Minis- terio quarry (type locality of the Los Catutos Member) the deposits reach a maximum thickness of 70 m. They were deposited in an open and shallow sea (c. 30-50 m depth) during the middle to late Tithonian, and were assigned to a transitional-outer ramp. El Ministerio quarry is located near Zapala, Neuquén Province. It carries a rich fossil concentration in which, among the vertebrates, fishes are predominant. Marine reptiles are also found. Among macroinvertebrates, ammonoids are the most common taxa (five ammonites zones were recognized), among microinvertebrates, the planktonic ones (radiolarians and foraminifers) are predominant. Benthic organisms (e.g. echinoderms, ostracods, gastropods) are scarce. Diffuse bioturbation is present in some banks. Water con- ditions were inferred as warm-temperate, and the micritic/clastic input rate was high. The distance to the shoreline was 100 km, without evidence of reef development. In the present contribution, we analyze 61 specimens from the lithographic limestones of El Ministerio quarry. We found that pachycormiforms are predominant (43% of specimens), followed by semionotiforms (13%), and aspidorhynchids (13%). Only 10% are represented by halecomorphs (caturid-like), teleost-like and “pholidophorid”-like, and