New Australian Taxa
Open-access, online, rapid taxonomy
This is an unpublished draft. Please do not distribute.
BULUNGU MUIRHEADAE Travouillon et al. 2013
New material—UCR 21816, right P1; UCR 21814, right P3; UCR 21808, left M1; UCR 21809, left M2; 648-662, left M2 broken and digested; UCR 21875, left m3; UCR 21804, left p3; UCR 22012, right m2; UCR 21810, right m3; UCR 21813, left m3; UCR 21811, left m1; UCR 21815, right m3 talonid; UCR 21812, right m3.
Age and Stratigraphy—All new specimens (except UCR 21875 and UCR 21804) are from the type locality, Tedford Locality (Site 2), site code RV 7230, Lake Palankarinna, Etadunna Formation, Ditjimanka LF, Zone B. UCR 21875 and UCR 21804 are from Steve’s Site, RV-8447, Lake Palankarinna, Etadunna Formation, Ditjimanka LF, Zone B.
See Travouillon et al. 2013.
The majority of the new specimens represent parts that were already described by Travouillon et al. 2013, except for the p3, P1 and P3, the morphology of which was previously unknown and which is described here.
Lower Dentition— In lateral view, the p3 is ovoid in occlusal view, longer than it is wide, and crescent-shaped. The main cuspid is tall and anteriorly positioned, above the anterior root. The main cuspid is slightly curved lingually at its tip. A small anterior cuspid is present just anterior to the main cuspid. These two cuspids at not connected by any crests. Posterior to the main cuspid, a short posterior cuspid is present above the posterior root. A well defined crest connects the main cuspid to the posterior cuspid.
Upper Dentition— The P1 is a simple tooth with a single cusp on the centre of the crown. In occlusal view, it is ovoid, longer than it is wide. No crests are present on the crown. The roots are long and wide, and extend the length and width of the tooth below the crown. The P3 is much larger than the P1, and has three distinct cusps on its crown. The anteriormost cusp is small and rounded,with a thin bladed shelf associated with it, bordering the lingual and buccal sides of the crown, and level with the anterior half of the anterior root. The main cusp is tall and wide, centrally positioned on the crown. A crest connects the main cusp to the posterior cusp, descending the steep posterior slope of the main cusp. The posterior cusp is much smaller than the main cusp but larger than the anterior cusp. A thin bladed shelf is also associated with the posterior cusp, and surrounds the posterior half of the crown both lingually and buccally.
Figure 3. Bulungu muirheadae, UCR 21804, left p3 (A, buccal view; B, lingual view; C, occlusal view); UCR 21816, right P1 (D, buccal view; E, lingual view; F, occlusal view); UCR 21814, right P3 (G, lingual view; H, buccal view; I, occlusal view). Scale bar equals 2mm.