Butseloglis montisalbani Freudenthal, 2004

Lu, Xiaoyu, Costeur, Loïc, Hugueney, Marguerite & Maridet, Olivier, 2021, New data on early Oligocene dormice (Rodentia, Gliridae) from southern Europe: phylogeny and diversification of the family, Journal of Systematic Palaeontology 19 (3), pp. 169-189 : 174

Butseloglis montisalbani Freudenthal, 2004 ( Fig. 4A–I)

Type locality. Montalb́an 1D (MP23).

Holotype. Departamento de las Ciencias de la Tierra, University of Zaragoza , MLB1D 1050, left M1.

Specimens and measurements from Montalb́an 1D. UCBL-FSL_218025 to 218033 and 218071, for measurements see Table 1 and Supplemental material, Appendix 2 ( Fig. 4A–I).

Description of the new specimens from Montalb́an 1D. In upper molars, the anteroloph and posteroloph are free lingually and labially. The anterotrope and posterotrope are absent. The protocone is anterior to the metacone. DP 4s are triangular. Only the weak centroloph is visible in DP 4. P4s display an oval shape with a well-developed precentroloph. Both M1s and M2s are rectangular. The anteroloph of M1 is shorter than that of M2. The precentroloph and postcentroloph are present in M1 and M2. The precentroloph is always developed, but the postcentroloph is sometimes weak. There is a strong reduction in M3 posteriorly. The state of the centrolophs is the same as M1/M2. The metaloph bends posterolabially but the posteroloph remains free.

In lower molars, the anterotropid is absent. The anterolophid becomes longer through m1 to m3. The metalophid is free lingually and labially, curved posteriorly only in m1. The centrolophid is long and free, without the precentrotropid and postcentrotropid nearby. A very weak posterotropid is only present in a few m2s.

Remarks. Butseloglis montisalbani was originally described as the type species of Schizogliravus , itself a junior synonym of Butseloglis . This species was not found in St-Martin-de-Castillon C. The type materials from Montalb́an 1D have been fully described by Freudenthal (2004). The new specimens from Montalb́an 1D are characterized by two equally important centrolophs which are always present in the upper molars; the centrolophid is frequently present, but not well developed; the mesolophid is well developed together with a weakly developed posterotropid. Our specimens consequently show no significant difference with the population described by Freudenthal (2004).