First Potwarmus from the Miocene of Saudi Arabia and the early phylogeny of murines (Rodentia: Muroidea) Author Antoñanzas, Raquel López text Zoological Journal of the Linnean Society 2009 2009-07-31 156 3 664 679 http://dx.doi.org/10.1111/j.1096-3642.2008.00494.x journal article 3167 10.1111/j.1096-3642.2008.00494.x d59ef689-6666-421e-8e46-c3fa65865db4 0024-4082 4687752 ‘ MYOCRICETODON ’ LIUI QIU, ZHENG & ZHANG, 2004 This species was erected on the basis of five isolated teeth from locality 12, Lantian County, Shaanxi Province , China . This locality documents the earliest fauna of the Bahe Formation ( Zhaoqun, Flynn & Qiu, 2005 ), which corresponds with an age of about 11 Mya ( Kaakinen et al. , 2005 ). The holotype ( V14036 ) is a right M1 ( Qiu et al. , 2004 : fig. 4). This species groups close to Antemus (see below), the most primitive definite murine, and has, therefore, no close relationship with Myocricetodon cherifiensis . It should definitely receive a new generic designation. The M1 of ‘ Myocricetodon ’ liui has a more anteriorly located and stronger enterostyle than AJ7. On the M2 of ‘ M. ’ liui , the lingual anterior cingulum is weaker than on AJ11 and AJ12, and the metacone is connected to the anterior side of the hypocone by a metaloph. On the Arabian specimens the metaloph is absent. The morphology of the m1 of ‘ M. ’ liui is very different from that of AJ 13 in having a well-developed anteroconid and a complete longitudinal crest.