Extrarius orhuni, Erten, 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 : 3-4

Extrarius orhuni sp. nov.

zoobank.org/ F6B0B5ED-51EC-4546-8A9E-BCDE161CCEDA

Type specimen, Type locality and Diagnosis. As for genus.

Derivatio nominis. In honour of my son; Orhun Erten.

Description of the Material

M1. There are three M 1 specimens (GOP 5001- 5002-5003) one of which (GOP 5003) is slightly worn and damaged on the back part ( Figure 3 ). One of the complete specimens (GOP 5001) has a complete stephanodonty (on the occlusal face all cups are connected by ridges, Cordy, 1976). t1, t2 and t3 have strong connections in all specimens. A connection in the form of a longitudinal crest exists between t1-t5 and t3-t5. Whereas a strong and garland-type of connection exists between t4-t5-t6-t9- t8 and t 7 in one of the specimens (GOP 5001), there exists no connection of t4-t 7 in the other two specimens ( Figure 3.2-3 ). t1 and t3 are almost symmetrical, like t4 and t6. A circular island shaped strong neoenterostyle exists in all specimens in the lingual parts of the teeth. The posteroloph is weak. There are three roots.

M2. There are two specimens, one of which (GOP 5005) is worn while the other (GOP 5004) is not. The t1 is oval, large and has a strong connection with t5. The t3, round, is smaller and lower than t1 and is connected to t5. A strong and garland-type of connection exists between t4-t5-t6-t9-t8 and t 7 in the worn specimen. There exists no connection of t4-t 7 in the other specimen.

m1. Only one m1 was found (GOP 5006). The tma is absent. The connection between the labial-lingual anteroconids is stronger than the connection between protoconid-metaconid. There is a weak connection between lingual anteroconid-metaconid, but no connection exists between labial anteroconid and protoconid. The hypoconid-entoconid connection is quite strong; the entoconid is linked to the metaconid by a thin ridge. The posteroconid is observed in the form of an oval island on the posterior part of the tooth. The c1 and c2 are connected to each other. There are two roots.

m2. There are two specimens (GOP 5007-5008). In both specimens, the anterior side is slightly wider than the posterior end. The anterolabial cuspid is large, oval and has a connection with the protoconid. There is no labial cingulum in our specimens. The posterior tubercule is shaped in the form of an enamel island, and it has a weak connection with the hypoconid. There are two roots.

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).