Borealestes mussetti, Sigogneau-Russell, 2003

Sigogneau-Russell, Denise, 2003, Docodonts from the British Mesozoic, Acta Palaeontologica Polonica 48 (3), pp. 357-374 : 358

Borealestes mussetti sp. nov.

Fig. 2C, D .

Holotype: MNHN J.495, right lower molar.

Derivation of the name: mussetti , to acknowledge the major participation of Dr. Frances Mussett in the accumulation of the Kirtlington fauna.

Molariforms.—BMNH J.1 (right posterior fragment), J.239 (right), J.319 (right), J.389 (right posterior fragment), J.401 (right posterior fragment), J.835 (right posterior fragment), J.836 (right),?J.66 (left posterior fragment),?J.224, (left anterior fragment),?J.394 (left posterior fragment),?J.809 (left anterior fragment).

Distribution.—Clay band, Kirtlington mammal bed in Forest Marble; upper Bathonian.

Diagnosis.—Lower molars differ from those of B.serendipitus by being slightly larger; antero−basal crest very weak and horizontally oriented, or even absent. Mesio−lingual cusp slightly more developed. Presence of antero−main crest; hence lingual face of main cusp with two parts, one being parallel to long axis of the tooth. Presence of anterior lingual cingulid. Posterior groove deeper.

Figures

Fig. 2. A. Borealestes serendipitus, left M3 of the holotype left lower jaw UBGM 20570, in lingual (A1), labial (A2), and occlusal (A3) views. B. Borealestes serendipitus, left lower molar BMNH J.791 in lingual (B1), labial (B2), anterior (B3), posterior (B4), and occlusal (B5) views. C. Borealestes mussetti sp. nov. holotype right lower molar BMNH J. 495 in lingual (C1), labial (C2), anterior (C3), posterior (C4), and occlusal (C5) views. D. Borealestes mussetti sp. nov. right lower molar BMNH J. 836 in lingual (D1), labial (D2), anterior (D3), posterior (D4), and occlusal (D5) views. Scale bar 1 mm.