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A new genus and species of Muridae (Rodentia) from the Quaternary deposits of the Denizli Basin, South-western Turkey

Hüseyin Erten

Plain Language Abstract

The Muridae (rodent mice) is a mammal family, which lives on all continents except Antarctic. Today, it has over 700 species around the world. Extrarius orhuni gen. nov. and sp. is different from all genera of this family because of the neoenterostyle on the occlusal surface of its upper first molar. This feature has been observed as an intraspecific variation in a few species since the Miocene. However, Extrarius orhuni gen. nov. and sp. is the first fossil group that shows this feature in all upper first molars, therefore, it is described as a new genus. As Darwin suggests, variation is a major focus of evolution because large morphological differences found among species stem from intraspecific variation processes. Accordingly, description of Extrarius orhuni gen. nov. and sp. as a new genus is significant in this respect.

Resumen en Español

Un nuevo género y especie de Muridae (Rodentia) de los depósitos cuaternarios de la Cuenca Denizli, Suroeste de Turquía

Se describe un nuevo género y especie de Muridae, Extrarius orhuni gen. et sp. nov. de los depósitos terrestres cuaternarios de la cuenca Denizli (suroeste de Turquía). El neoenterostilo, con forma de isla circular, en la parte lingual del M1, y la completa estefanodontia muestran una combinación única de caracteres apomórficos. Estos fósiles iniciales proporcionan un punto de partida; posteriores estudios seguramente proporcionarán más detalles sobre los orígenes de este taxón y su relación con otros taxones en una región más amplia.

Palabras clave: Muridae; Nuevo género; Nueva especie; Cuaternario; Denizli; Turquía

Traducción: Enrique Peñalver (Sociedad Española de Paleontología)

Résumé en Français

Une nouvelle espèce dans un nouveau genre de Muridae (Rodentia) des dépôts quaternaires du bassin de Denizli, sud-ouest de la Turquie

Ce papier décrit un nouveau genre et une nouvelle espèce de Muridae, Extrarius orhuni gen. et sp. nov., provenant des dépôts terrestres quaternaires du bassin de Denizli (sud-ouest de la Turquie). Le néoentérostyle en forme d'île circulaire dans la partie linguale de la M1 et la stéphanodonie complète indiquent une combinaison unique de caractères apomorphes. Ces premiers fossiles fournissent un point de départ et des études additionnelles fourniront à coup sûr plus de détails sur les origines de ce taxon et ses relations avec d'autres taxons dans la région.

Mots-clés : Muridae ; nouveau genre ; nouvelle espèce ; Quaternaire ; Denizli ; Turquie

Translator: Antoine Souron

Deutsche Zusammenfassung

Eine neue Gattung und Art der Muridae (Rodentia) aus den quartären Ablagerungen der Denizli Beckens, Südwest-Türkei

Diese Abhandlung beschreibt eine neue Gattung und Art der Muridae, Extrarius orhuni gen. nov. und sp. aus den terrestrischen quartären Ablagerungen des Denizli Beckens (Südwest-Türkei). Das runde inselförmige Neoenterostyl des lingualen Teils des M1 und die komplette Stephanodontie zeigen eine einzigartige Kombination apomorpher Merkmale. Diese ursprünglichen Fossilien stellen eine Ausgangssituation dar und weiterführende Untersuchungen werden sicherlich mehr Details zu den Ursprüngen dieses Taxons und seiner Verwandtschaftsbeziehungen zu anderen Taxa in der Region insgesamt liefern.

Schlüsselwörter: Muridae; neue Gattung; neue Art; Quartär; Denizli; Türkei

Translator: Eva Gebauer

Arabic

Translator: Ashraf M.T. Elewa

 

 

authorHüseyin Erten. Department of Geological Engineering, Pamukkale University, 20017 Kınıklı-Denizli, Turkey. This email address is being protected from spambots. You need JavaScript enabled to view it.

Hüseyin Erten graduated from Pamukkale University, Department of Geological Engineering, Turkey in 1999 and received his PhD in 2013. He has been working at Pamukkale University, Turkey since 1999. His interests are focused on Neogene and Quaternary aged small and large fossil mammals. 

 

FIGURE 1. 1, Location of the Denizli Basin in western Turkey (modified from Bozkurt, 2003); 2, Geological map of the Denizli Basin modified from Erten et al. (2014) with the position of Gökpınar locality.

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FIGURE 2. Dental terminology of murid upper and lower molars (after Lazzari et. al., 2010).

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FIGURE 3. Occlusal views of Extrarius orhuni nov. gen. and sp from Gökpınar (GOP). 1, left M1 (GOP-5001); 2, right M1 (GOP-5002); 3, right M1 (GOP-5003); 4, left M2 (GOP-5004); 5, left M2 (GOP-5005); 6, left m1 (GOP-5006); 7, right m2 (GOP-5007); 8, right m2 (GOP-5008).

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FIGURE 4. Comparison of the species that have neoenterostyle in upper first molars. 1, Gökpınar locality (GOP-5001); 2, Orientalomys cf. similis from Pliocene aged Ertemte in Inner Mongolia, China (Storch 1987, plate 3); 3, Leilaomys zhidingi from Late Miocene aged Yunnan Province, China (Storch and Ni 2002, figure 2.6); 4, Progonomys clauzoni from Late Miocene, eastern France (Lazzari et. al., 2010, figure 1.1). The length of teeth has been made the same in order to facilitate morphological comparison and to draw attention to differences in shape.

figure4 

 

TABLE 1. Material and measurements of Extrarius orhuni nov. gen. and sp. from Gökpınar locality (GOP).

Specimen number Molar Length Width
GOP -5001 M1 2.07 1.28
GOP-5002 M1 2.09 1.30
GOP-5003 M1 - 1.26
GOP-5004 M2 1.26 1.18
GOP -5005 M2 1.30 1.20
GOP -5006 m1 1.72 1.03
GOP -5007 m2 1.12 1.02
GOP -5008 m2 1.10 1.00