The Abruzzo-Apulian (Central and Southeastern Italy) fossil fauna, new challenges for paleontologists and paleobiogeographers

The Abruzzo-Apulian Platform was an endemic Neogene paleobioprovince. Its relics can be found at the south-east of the Italian Peninsula. Geological and paleontological traces of this past land crop out both in the central Apennines, Maiella (Scontrone fossiliferous site), as well as in the Gargano Promontory.The Scontrone paleofauna -Scontrone is placed on the southern borderline of the Abruzzo National Park, Central-Southern Apennine. The bone-bearing sediments are coastaltidal-flat calcarenites stratigraphically dated to the Lower Tortonian. They yielded remains of terrestrial mammals, which include the bizarre ruminant Hoplitomeryx and the giant insectivore Deinogalerix, of a large terrestrial bird, and of large crocodilians and chelonians. At present, Hoplitomeryx, Deinogalerix and the crocodilians represent the elements in common with the Gargano community. The fauna is endemic and quite unbalanced. Six species of Hoplitomeryx have been described until now, but other species are adding to the list as new specimens are being freed from the calcarenites. Deinogalerix seems also represented by more than a single species. No mammal carnivores nor small mammals were found until now.The Gargano paleofauna - A very diversified endemic fauna is contained in soil deposits (Terre Rosse) that fill an extensive karst system at the north-western slopes of Mount Gargano (Southern Italy). The fossil assemblages include both large and small mammals, birds, reptiles, and amphibians, and are highly unbalanced. The small mammal component is mainly made of rodents, lagomorphs, and insectivores. Larger mammalian taxa are less abundant and are represented by Hoplitomericidae, Deinogalerix. And the sea otter Paralutra garganensis. The fissure fillings have been arranged in a biochronological sequence based on their different faunal composition and evolutionary degree. During the time period documented by the fissure deposits the faunal diversity changed and several taxa underwent significant evolutionary modifications, giving rise to numerous adaptive radiations. Taxa weakly- or non-modified compared to their continental counterparts characterize the oldest assemblages. They likely represent the youngest dispersal phase from the mainland into the insular domain, suggesting a polyphasic origin of the community.Evidence of apparently the oldest faunal settlement in Gargano was found in the recently discovered fissure M013. It contains remains of a new murid, which is manifestly the ancestor of Mikrotia (the endemic and widespread murid of the Terre Rosse), together with those of a new Cricetodontinae, which resembles primitive early Miocene representatives. These occurrences, in addition to the absence of Apodemus and Prolagus, two ubiquitous taxa of the Terre Rosse fillings, confirm that the assemblages are the result of a set of successive bioevents.The age and paleogeography of Scontrone and Gargano: the Abruzzo-Apulian domain - The Early Tortonian age of the Scontrone fauna is unequivocally proven not only by solid geologic evidence, but also by the Hoplitomeryx representatives, which are comparatively more primitive than their Gargano counterparts. The same might apply to the Deinogalerix specimens from the two localities, but analyses are still under way to check this aspect. The Gargano fissure fillings are tentatively dated to the Late Miocene on the basis of paleontological inferences, namely the occurrence of Apodemus, which is supposed to be not older than MN12 in the European mainland. The Gargano’s younger age possibly reflects the fact tha