Abstract
All species of fossil marsupials belonging to the genus Hyperdidelphys Ameghino , 1904 (Didelphidae, Didelphinae, Didelphini) are analyzed and rediagnosed: H. inexpectata (Ameghino, 1889), H. pawula (Rovereto, 1914), H. pattersoni (Reig, 1952) and the new species H. dimartinoi. The biochron of this genus spans from the Late Miocene (Huayquerian StageIAge) to the Late Pliocene (Chapadmalalan StageIAge); al1 records referable to species of Hyperdidelphys come from central and northwestern Argentine localities. Hyperdidelphys and Lutreolina conform a monophyletic group among the Didelphini, being Lutreolina the plesiomorphic sister group of Hyperdidelphys. H. pattersoni is the sister group of a clade including two monophyletic groups: H. pawula on one side, and H. inexpectata + H. dimartinoi sp. nov. on the other. Several taxa previously referred to this genus are discussed and excluded from it: (1) «Hyperdidelphys brachyodonta» (Reig, 1952) is a junior synonym of Didelphis crucialis Ameghino,1904; (2) «Hyperdidelphys biforata» (Ameghino, 1904) is a species of Lutreolina (L. biforata n. comb.), and (3) «Paradidelphys nodosa» Ameghino, 1904 is a junior synonym of Thylophorops perplana (Ameghino, 1904) n. combo The biostratigraphic significance of the species of Hyperdidelphys in the Late Cenozoic of Southern South America remains unelear: their record in Neogene levels is unfrequent, the identification of two of the four species ( H. parvula and H. inexpectata) is complex on the basis of known materials, and the biochrones of three of them are not restricted but inelude relatively wide time spans. Carnivorous adaptations of species of Hyperdidelphys correlate with the decline of Sparassodont marsupials in late Miocene-Pliocene times, a process that was previous to the arrival in South America of inmigrant placental carnivores of Holarctic origin by the stablishment of the intercontinental Panamanian land bridge.
Highlights
E (Huayquerian StageIAge) to the Late Pliocene (Chapadmalalan StageIAge); al1 records referable to species of Hyperdidelphys come from central and northwestern Argentine localities
1904; (2) «Hyperdidelphys biforata» (Ameghino, 1904) is a species of Lutreolina (L. biforata n. comb.), and (3) «Paradidelphys nodosa» Ameghino, 1904 is a junior synonym of Thylophorops perplana (Ameghino, 1904) n. combo The biostratigraphic significance of the species of Hyperdidelphys in the Late Cenozoic of Southern South America remains unelear: their record in Neogene levels is unfrequent, the identification of two of the four species (H. parvula and H. inexpectata) is complex on the basis of known materials, and the biochrones of three of them are not restricted but inelude relatively wide time spans
Carnivorous adaptations of species of Hyperdidelphys correlate with the decline of Sparassodont marsupials in late Miocene-Pliocene times, a process that was previous to the arrival in South America of inmigrant placental carnivores of Holarctic origin by the stablishment of the intercontinental Panamanian land bridge
Summary
Se analizan y diagnostican nuevamente todas las especies de marsupiales fósiles asignable~al género Hyperdidelphys Ameghino, 1904 (Didelphidae, Didelphinae, Didelphini): H. inexpectata (Ameghino, 1889),H. pawula (Rovereto, 1914), H. pattersoni (Reig, 1952) y la nueva especie H. dimartinoi. Las adaptaciones carnívoras de las especies de Hyperdidelphys se corresponden con un proceso general de declinación de los marsupiales Sparassodonta hacia el Mioceno tardío y Plioceno de América del Sur, un proceso que precedió a la llegada de los carnívoros placentarios inmigrantes de origen holártico a partir del establecimiento del puente panameño entre ambas Américas. Palabras clave: Hyperdidelphys, Didelphidae, Marsupialia, América del Sur, Neógeno, Edades Huayqueriense, Montehermosense y Chapadmalalense
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