A new approach to the Late Miocene-Early Pliocene forms of the genus Apocricetus. Apocricetus alberti (Rodentia,Mammalia) from Venta del Moro (Cabriel Basin,Spain) |
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| Authors: | Samuel Mansino Francisco Javier Ruiz-Sánchez Matthijs Freudenthal Plinio Montoya |
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| Institution: | 1. Department of Geology, University of Valencia, Dr. Moliner s/n, 46100 Burjassot, Valencia, Spain;2. Valencian Museum of Natural History, L’Hort de Feliu, P.O. Box 8460, Alginet, 46018, Valencia, Spain;3. INCYT-UPSE, Universidad Estatal Península de Santa Elena, 7047, Santa Elena, Ecuador;4. Departamento de Estratigrafía y Paleontología, University of Granada, 18071 Granada, Spain;5. Netherlands Centre for Biodiversity, Naturalis, P.O. Box 9517, NL-2300 RA Leiden, The Netherlands |
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| Abstract: | The species of the genus Apocricetus are considered to form the phyletic lineage A. aff. plinii (MN11)–A. plinii–A. alberti–A. barrierei–A. angustidens (MN16). Along this lineage, gradual morphological and biometrical changes occur, but not all the species are represented by rich populations. The assemblage of Apocricetus alberti from Venta del Moro is by far the most abundant collection of this species. This population shows a great morphological variability in some characters like the morphology of the anteroconid and the anterolophulids in m1 and the shape of the anterolophule in M1, with morphotypes that resemble both older and younger populations of Apocricetus. Along the phyletic lineage of Apocricetus, a change in the shape of m3 occurs, from predominantly subtriangular forms in the oldest populations to predominantly subrectangular in the youngest. To quantify this feature we use the posterior width of the molar and the anterior width/posterior width ratio, proposing five morphological categories, from extremely triangular to subrectangular. |
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| Keywords: | Apocricetus Late Miocene Spain Venta del Moro Shape m3 |
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