Apatodemus degiulii n. gen. et sp. (Rodentia, Muridae), a hitherto undescribed endemite from the Terre Rosse of Gargano (Late Miocene, Southeastern Italy)

Federico Masini, Colombero, Andrea Savorelli

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Abstract

The taxonomy of the murid that had been ascribed to the genus Apodemus from the late Miocene insular faunal assemblages of Gargano(Southeastern Italy) is revised. Morphological and odontometric analyses of important new dental characters were undertaken. Ourinvestigations revealed substantial morphological differences from Apodemus. The rodent is therefore assigned to a new genus andspecies, Apatodemus degiulii. The new species is characterised by a combination of advanced and primitive characters: moderatelybrachyodont teeth, t7 present in all M1–2s, elongated and distally located t1 in M1, t1 often twinned in M1–2, and narrow labialcingulid in lower molars associated to a well-developed tma. The genus Apatodemus actually includes two distinct species of differentage. A. degiulii is the oldest and is described here in detail. The other one, for the moment, is referred to as Apatodemus sp.: a morecomprehensive description of it will be presented in a future publication. Apatodemus sp. is a highly modified, endemic species, whereasA. degiulii is slightly endemized. Despite the features of Apatodemus degiulii render difficult to asses its closest continental ancestor,the species likely originated from some south-eastern European stock, in agreement with paleo-geographical reconstructions suggestingperiodic connections of the Abruzzo-Apulian paleobioprovince with the Balkan mainland. The age when the ancestor of Apatodemusreached the Apulia Platform is still unclear. However, some lines of evidence suggest a probable arrival at the time of the MN13 unit(latest Miocene).
Original languageEnglish
Pages (from-to)25-49
Number of pages25
JournalPALAEONTOGRAPHICA ABTEILUNG A PALÄOZOOLOGIE, STRATIGRAPHIE
Volume306
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • Stratigraphy
  • Palaeontology

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