Gen.indet.

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 : 132

Gen. et sp. indet .

EXAMINED MATERIAL. — FSAC-Bouj-358 ( Fig. 5F ), fragment of toothed bone .

DESCRIPTION

The bone supports two subcomplete and four broken teeth, with very reduced interspace. Teeth are labiolingually compressed, with sharp and convex edges and acute apex. The base of the external surface of the tooth shows a small median depression. The pulpar cavity is full. The lingual surface of the bone is smooth. The labial side is concave but less preserved.

REMARKS

The tooth morphology and its position in the bone are very similar to scombroid remains found in the Priabonian beds of Ad-Dakhla ( Zouhri et al. 2017). Comparable teeth are retrieved in the extant Acanthocybium Gill, 1862 , and in the fossils Aramichthys Signeux, 1959 from the Eocene of Syria and Scomberodon , Neocybium and Palaeocybium Monsch, 2004 from the Eocene of Belgium and England ( Leriche 1905, 1910; Signeux 1959; Monsch 2004). Comparable isolated teeth from the Ypresian Phosphate basins of Morocco were referred to Scomberodon dumonti by Arambourg (1952, Cybium dumonti in the text).

Figures

FIG. 5. — Actinopterygii and Testudines from the Sabkha of Gueran: A-G, Actinopterygii: Cylindracanthus sp., FSAC Bouj-356, rostrum in (A1) lateral and (A2) transversal views; B-E, Percomorpha indet.: B, FSAC Bouj-369,vertebra in (B1) lateral and (B2) transversal views; C, FSAC Bouj-363, vertebra in (C1) lateral and (C2) transversal views; D, FSAC Bouj-370, basioccipital in left lateral view; E, FSAC Bouj-371, fin spine in anterior view; F, Scombridae indet., FSAC Bouj-358, incomplete jawbone in labial view; G, Siluriformes indet., FSAC Bouj-372, right pectoral spine in anterior view; H-P, Testudines: H-L, Cheloniidae indet., FSAC Bouj-109,fragmentary costal in (H1) lateral transection, (H2) ventral, (H3) dorsal and (H4) medial transection views; I, FSAC Bouj-352,fragmentary lateral process of right hyoplastron in (I1) ventral and (I2) dorsal views; J, FSAC Bouj-351, subcomplete right hypoplastron in (J1) ventral and (J2) dorsal views; K, FSAC Bouj- 353, fragment of dermal plate, unlocated on the carapace, in dorsal view; L, FSAC Bouj-354, fragment of dermal plate, unlocated on the shell in (L1, L2) both faces; M, Dermochelyidae indet., FSAC Bouj-350, lateral pubic process of right pubis in (M1) ventral and (M2) dorsal views; N,? Podocnemidoidea indet., FSAC Bouj-196, fragment of right hypoplastron in (N1) dorsal and (N2) ventral views; O, Indeterminata (? Podocnemidoidea indet.), FSAC Bouj-95, fragment of dermal plate of carapace in (O1) dorsal and (O2) ventral views; P, Gueran turtles, pieces of the four fragments of Figure 5I, J, L and M, as preserved in view of conjunction in situ. Scale bars: 20 mm.