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To Link and Cite This Article: Doi: 10.5710/AMGH.20.04.2020.3329 Submitted: December 19th, 2019 – Accepted: April 20th, 2020 – Published online: April 27th, 2020 To link and cite this article: doi: 10.5710/AMGH.20.04.2020.3329 1 NEW DATA ON THE DIVERSITY OF NOTOUNGULATA (MAMMALIA) FROM 2 THE FRAY BENTOS FORMATION (LATE OLIGOCENE) IN CORRIENTES 3 PROVINCE, ARGENTINA 4 NUEVOS DATOS SOBRE LA DIVERSIDAD DE NOTOUNGULATA (MAMMALIA) 5 DE LA FORMACIÓN FRAY BENTOS (OLIGOCENO TARDÍO) EN LA PROVINCIA 6 DE CORRIENTES, ARGENTINA 7 ESPERANZA CERDEÑO1, GABRIELA I. SCHMIDT2, ÁNGEL R. MIÑO-BOILINI3 8 AND ALFREDO E. ZURITA3 9 1Paleobiología y Paleoecología, Instituto Argentino de Nivología, Glaciología y Ciencias 10 Ambientales (IANIGLA), Centro Científico Tecnológico-CONICET-Mendoza. Avenida 11 Ruiz leal s/n, M5500 Mendoza, Argentina. [email protected] 12 2Laboratorio de Paleontología de Vertebrados, Centro de Investigación Científica y de 13 Transferencia Tecnológica a la Producción (CICYTTP-CONICET)-Prov. ER-UADER, 14 España 149, E3105BWA, Diamante, Entre Ríos, Argentina. [email protected] 15 3Centro de Ecología Aplicada del Litoral (CECOAL-CONICET) y Universidad Nacional 16 del Nordeste. Ruta 5, Km 2,5, cc 128, 3400, Argentina. [email protected], 17 [email protected] 18 39 pages (text+references); 3 figures; 6 tables. 19 Proposed header: CERDEÑO ET AL.: LATE OLIGOCENE NOTOUNGULATA FROM 20 CORRIENTES 21 Short description: Notoungulate remains from the Deseadan Fray Bentos Formation in 22 Corrientes Province are revised and taxonomically updated. 23 Corresponding author: Esperanza Cerdeño, [email protected] 1 24 25 Abstract. We revise the mammal fossils from the Fray Bentos Formation previously 26 assigned to Notoungulata, as well as some new remains recovered from levels cropping out 27 in Corrientes Province (Argentina). In some cases, previous determinations have been 28 completed to the species level, but others have been substantially modified, identifying 29 different families. At present, identified taxa are: “Prohegetotherium” schiaffinoi 30 (Hegetotheriidae), an undetermined interatheriid that is hypothesized as representing the 31 upper teeth of Eopachyrucos ranchoverdensis, and Argyrohyrax proavus (Interatheriidae), 32 cf. Archaeohyrax suniensis (Archaeohyracidae), cf. Mendozahippus fierensis 33 (“Notohippidae”), a Leontiniidae indet., and some undetermined Notoungulata. The 34 presence of Leontiniidae is based on the specimen CTES-PZ 7871, but those previously 35 assigned to this family are herein discarded as such and reinterpreted (notohippid and 36 undetermined taxon). The Mesotheriidae are discarded among the revised materials, but 37 they are present in the Fray Bentos Formation in Corrientes Province with Trachytherus 38 spegazzinianus (= Ameghinotherium curuzucuatiense). The revised sample presents 39 affinities with the fauna from the type locality of the Fray Bentos Formation, in Uruguay, 40 and the Deseadan assemblages from Quebrada Fiera (Mendoza Province, Argentina), 41 Patagonia (Argentina), and Salla (Bolivia). These similarities are important from a 42 paleobiogeographic point of view, especially by the recognition of cf. M. fierensis, a 43 species only known from Mendoza up to now. Only the finding of new material from Fray 44 Bentos Formation in Corrientes Province will allow us to corroborate these tentative 45 determinations and a possible eastward extension of up-to-now exclusive taxa from 46 Quebrada Fiera. 47 Key words. Native ungulates. Cenozoic. Deseadan. Corrientes. Argentina. South America. 2 48 Resumen. NUEVOS DATOS SOBRE LA DIVERSIDAD DE NOTOUNGULATA 49 (MAMMALIA) DE LA FORMACIÓN FRAY BENTOS (OLIGOCENO TARDÍO) EN 50 LA PROVINCIA DE CORRIENTES, ARGENTINA. Se revisan los restos atribuidos 51 previamente a distintos taxones de notoungulados procedentes de la Formación Fray Bentos 52 que aflora en la provincia de Corrientes (Argentina). En unos casos, se ha completado la 53 determinación taxonómica hasta el nivel de especie, pero en otros se ha modificado 54 radicalmente, adjudicando los restos a familias diferentes de las consideradas previamente. 55 Los notoungulados presentes son: “Prohegetotherium” schiaffinoi (Hegetotheriidae), un 56 interatérido indeterminado para el que se plantea la hipótesis de que representa los 57 premolares superiores de Eopachyrucos ranchoverdensis, y Argyrohyrax proavus 58 (Interatheriidae), cf. Archaeohyrax suniensis (Archaeohyracidae), cf. Mendozahippus 59 fierensis (“Notohippidae”), un Leontiniidae indet. y varios ejemplares indeterminados. La 60 presencia de Leontiniidae se basa en el espécimen CTES-PZ 7871, pero se descartan y 61 reinterpretan (notohípido y taxón indeterminado) los atribuidos previamente a esta familia. 62 Los Mesotheriidae no se reconocen entre el material revisado, pero están presentes en la 63 Formación Fray Bentos en la provincia de Corrientes con Trachytherus spegazzinianus (= 64 Ameghinotherium curuzucuatiense). La muestra revisada presenta semejanzas con la fauna 65 de la localidad tipo de la Formación Fray Bentos, en Uruguay, y con las asociaciones 66 deseadenses de Quebrada Fiera (provincia de Mendoza, Argentina), Patagonia (Argentina) 67 y Salla (Bolivia). Estas similitudes tienen gran importancia paleobiogeográfica, 68 especialmente por el reconocimiento de cf. M. fierensis, conocido hasta ahora únicamente 69 en Mendoza. Solo la obtención de nuevos materiales de la Formación Fray Bentos en 70 Corrientes permitirá corroborar las determinaciones tentativas y la posible extensión hacia 71 el este de taxones hasta ahora exclusivos de Quebrada Fiera. 3 72 Palabras clave. Ungulados nativos. Cenozoico. Deseadense. Corrientes. Argentina. 73 América del Sur. 4 74 75 THE FRAY BENTOS FORMATION was defined by Harrington (1956) in Uruguay, where it 76 crops out along the Uruguay River, from Colonia to the Brazilian boundary, with a 77 thickness of 15–18 m (Ubilla, 2004). This unit is mainly composed of continental fine to 78 medium sandstones, silts, sometimes calcretes and conglomerates, mainly reddish grey to 79 reddish brown; they are principally of fluvial origin, and only partially eolian (Ubilla, 80 2004). From a climatic point of view, these sediments were deposited under warm and dry 81 conditions (Ferrando & Dasa, 1974). In the current territory of Argentina, the Fray Bentos 82 Formation has been also recognized in the provinces of Corrientes and Entre Ríos (Herbst 83 and Santa Cruz, 1999), where this unit is composed of very fine sandstones to silts, with 84 clay to calcareous-clay cements (Herbst, 1980: 309). In turn, Álvarez (1978) and Herbst 85 (1980) differentiated two sections: the lower "sedimentos calcáreos de Curuzú Cuatiá" 86 (calcareous sediments of Curuzú Cuatiá) and the upper section composed of reddish 87 limestone-sands. Nevertheless, most fossils lack a precise stratigraphic provenance and 88 only a general datum is provided in old labels and publications (e.g., Río Corrientes; see 89 below for each taxon). Some were collected in sediment removals during public works, and 90 even the most recently recovered material lack precise data, as they have been occasional 91 findings in a quarry. 92 Fossil mammals from the Fray Bentos Formation in Corrientes and Entre Ríos 93 provinces (Fig. 1) are represented by xenarthrans, native ungulates, and rodents, previously 94 studied and mentioned by Podestá (1899), Álvarez (1978), Bond et al. (1998), Reguero 95 (1999), Carlini et al. (2007), and Zurita et al. (2016). The age of this formation has been 96 restricted to the late Oligocene, Deseadan South American Land Mammal Age— 97 SALMA—(Ubilla, 2004; Perea et al., 2014). 5 98 The Deseadan SALMA represents an important temporal interval in the South 99 American mammal evolution, with the appearance of some groups of xenarthrans, 100 notoungulates, litopterns, and marsupials (Dozo et al., 2014; Woodburne et al., 2014; and 101 references therein) and a great diversity of caviomorph rodents (Vucetich et al., 2015); it is 102 also the epoch with the last appearance of different groups of mammals such as pyrotheres, 103 Trachytheriinae mesotheriids, or archaeohyracids (Woodburne et al., 2014; Croft, 2016). 104 Deseadan fossil-bearing sediments in Argentina are mainly known in Patagonia (Chubut 105 and Santa Cruz provinces), but they are also represented in Entre Ríos, Corrientes, and 106 Mendoza provinces (e.g., Bond et al., 1998; Cerdeño & Vera, 2017; and references 107 therein). Outside Argentina, Deseadan faunas are known from Bolivia, Brazil, Uruguay, 108 and Peru (e.g., see Shockey et al., 2016). 109 The purpose of this contribution is to revise the specimens of Notoungulata 110 exhumed from the Fray Bentos Formation in Corrientes Province, updating their taxonomic 111 status after comparisons with presently known Deseadan faunas. The fossil-bearing 112 localities are located in the SE of the province, and are reduced in extension, including Río 113 Corrientes, Arroyo María Grande, Arroyo Ávalos, and south of Curuzú Cuatiá, all of them 114 in the Curuzú Cuatiá Department (Álvarez, 1978). 115 Institutional abbreviations. MACN A, Museo Argentino de Ciencias Naturales “B. 116 Rivadavia”, Ameghino Collection, Buenos Aires, Argentina; MAMC, Museo de 117 Arqueología de Canelones, Canelones, Uruguay; MCNAM-PV, Museo de Ciencias 118 Naturales y Antropológicas “J. C. Moyano”, colección Paleontología de Vertebrados, 119 Mendoza, Argentina; MLP, Museo de La Plata, colección Paleontología de Vertebrados, 120 La Plata, Argentina; MNHN-BOL-V, Museo Nacional de Historia Natural-Vertebrados,
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