Extrarius, Erten, Hüseyin, 2017

Erten, Hüseyin, 2017, A new genus and species of Muridae (Rodentia) from the Quaternary deposits of the Denizli Basin, South-western Turkey, Palaeontologia Electronica 11 (1), pp. 1-7 : 3

Genus Extrarius gen. nov.

Figure 3.1 -8

zoobank.org/ D78F4C83-C2E5-4DBB-981C-C057EEF9F046

Type species. Extrarius orhuni sp. nov.

Type specimen. left M1 (GOP-5001)

Referred specimens. right M1 (GOP-5002), right M1 (GOP-5003), left M2 (GOP-5004), left M2 (GOP-5005), left m1 (GOP-5006), right m2 (GOP-5007), and right m2 (GOP-5008)

Type locality. Gökpınar , Denizli Basin Turkey. Tosunlar Formation, Quaternary

Derivatio nominis. From the Latin word ‘ Extrarius ’ meaning “external, outsider,” because of the presence of a neoenterostyle on M1, which is an apomorphic character.

Diagnosis. The occlusal surface exhibits complete stephanodonty. The cusps t1, t2 and t3 have strong connections on M1. A connection in the form of a longitudinal crest exists between t1-t5 and t3-t5. A strong and garland-type connection exists between t4-t5-t6-t9-t8 and t7 or t4-t7 connection is absent while the other cusps are strongly connected. A circular island shaped neoenterostyle is observed in the lingual part of the tooth. tma is absent on m1, and c1 and c2 are connected to each other ( Figure 3 ).

Figures

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).