Macrorhizodus praecursor ( Leriche, 1905 ), 1864

Zouhri, Samir, Gingerich, Philip D., Khalloufi, Bouziane, Bourdon, Estelle, Adnet, Sylvain, Jouve, Stéphane, Elboudali, Najia, Amane, Ayoub, Rage, Jean-Claude & Tabuce, Rodolphe, 2021, Middle Eocene vertebrate fauna from the Aridal Formation, Sabkha of Gueran, southwestern Morocco, Geodiversitas 43 (5), pp. 121-150 : 125

Macrorhizodus praecursor ( Leriche, 1905)

EXAMINED MATERIAL. — Hundreds of isolated teeth, figured material includes FSAC Bouj-327, 328, 329 and 330.

DESCRIPTION

The more abundant complete and well-preserved teeth ( Fig. 2 H-K) recovered in both localities (Locality I, Garouaz, Iddir and Laazri) belong to the lamnid Macrorhizodus praecursor . Central cusp is especially triangular in anterolateral files (e.g., Fig. 2J ) with a flat labial face and a little convex lingual face.

REMARKS

This species, representing an extinct pelagic mako shark, is very abundant in all middle and late Eocene localities and distributed worldwide in the marine realm.

Figures

FIG. 2. — Elasmobranchii Lamniformes teeth remains from Sabkha of Gueran collected around Archaeocete whale carcasses: A-C, Otodus (Carcharocles) cf. sokolowi: A, FSAC Bouj-320 lateral upper tooth in (A1) labial and (A2) lingual views; B, FSAC Bouj-321 anterior lower tooth in labial view; C, FSAC Bouj-322 lateral lower tooth in labial view; D, E, Otodus (Carcharocles) sp.: D, FSAC Bouj-323 antero-lateral tooth in (D1) labial and (D2) lingual views; E, FSAC Bouj-324 lateral tooth (E1) labial and (E2) lingual views; F, G, “Carcharias” koerti; F, FSAC Bouj-325 anterolateral upper tooth in (F1) labial and (F2) lingual views; G, FSAC Bouj-326 anterior tooth of juvenile (G1) labial and (G2) lingual views; H-K, Macrorhizodus praecursor: H, FSAC Bouj-327 anterior lower tooth (H1) labial and (H2) lingual views; I, FSAC Bouj-328 anterior upper tooth in (I1) labial and (I2) lingual views; J, FSAC Bouj-329 lateral upper tooth in (J1) labial and (J2) lingual views; K, FSAC Bouj-330 lateral lower tooth (K1) labial and (K2) lingual views. Scale bars: 10 mm.