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New Mammal from the Early Eocene of Morocco Exemplifying Unexpected Early Diversity of Proboscideans

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New Mammal from the Early Eocene of Morocco Exemplifying Unexpected Early Diversity of Proboscideans New mammal from the Early Eocene of Morocco exemplifying unexpected early diversity of Proboscideans E. Gheerbrant1, J. Sudre2, H. Cappetta2, M. Iarochène3, M. Amaghzaz4, B. Bouya4 1Laboratoire de Paléontologie (UMR 8569 du CNRS), Muséum National d'Histoire Naturelle, Paris, France 2Laboratoire de Paléontologie (UMR 5554 du CNRS), Université Montpellier II, Montpellier Cedex 05, France 3Collections Paléontologiques du Service Géologique du Maroc, Direction de la Géologie, Ministère de l'Energie et des Mines, Rabat-Instituts, Maroc 4Office Chérifien des Phosphates, Service Géologique de Khouribga, Khouribga, Maroc SUMMARY: We report a new primitive proboscidean from the basal Eocene phosphatic beds of the Ouled Abdoun Basin, Morocco, which is both the earliest large placental mammal known in Africa and one of the earliest known proboscideans with Phosphatherium from the same locality. This discovery evidences an unexpected precocious diversity of proboscideans in Africa. Since the description in 1996 of the earliest ers, we report a new primitive proboscidean known proboscidean Phosphatherium escuilliei from the same early Ypresian phosphatic beds from the phosphatic beds of the Ouled Abdoun yielding P. escuilliei. Its early Ypresian age is Basin, Morocco, new data have been collected supported by the selachian taxa identified in the on the mammals from this locality. An impor- matrix of the specimens. tant new material exemplifies several new taxa This species, studied and described as a new of archaic ungulates (“condylarths”) and early genus and species by Gheerbrant et al. (in proboscideans and hyracoideans (Gheerbrant et prep.), is characterized by its large size close to al. 2001 a,b). It adds especially significant data Numidotherium koholense Jaeger 1986 from on the small Phosphatherium (Gheerbrant et al. the early/middle Eocene of El Kohol, Algeria. 1996, 1998), for which we now know the skull This is indeed the oldest known large mammal and the lower dentition. Recent field studies, from Africa and one of the oldest known pro- especially the recognition of the fossiliferous boscideans with P. escuilliei. level yielding mammals in the phosphatic local The new Ouled Abdoun proboscidean is series and our selachians samples in this level, known mainly by the lower dentition docu- indicate an earliest Ypresian age, in accordance mented by two well preserved dentaries bear- with the classical stratigraphy established in the ing the jugal teeth. The molars are character- Ouled Abdoun basin by Arambourg (1952). ized by a bilophodont and true lophodont pat- The Thanetian selachian taxa previously identi- tern, very close to Numidotherium and Bary- fied in the matrix of the holotype of P. escuilliei therium ones. The new taxon is closer to these (see Gheerbrant et al. 1996, 1998) are actually genera and more advanced than Phosphatheri- reworked from the underlying phosphate level um in several noticeable features (lower jaw (level 2 of the local stratigraphical terminology). with high articular condyle and horizontal Among this new Ouled Abdoun mammal ma- ramus, premolars molarized, P/4 sub-bilo- terial, mostly recovered from local fossil deal- phodont and large size), but it is also very 637 The World of Elephants - International Congress, Rome 2001 primitive in several striking features known in REFERENCES Phosphatherium, such as, the short anterior dentition which lacks diastema and retains two Arambourg, C. 1952. Les vertébrés fossiles des additional anterior teeth in front of P/2 (C/1 gisements de phosphates (Maroc - Algérie - and I/3 or P/1 and C/1 according to the pre- Tunisie). Notes et Mémoires du Service served alveoli). This is indeed a distinctive Géologique du Maroc 92: 1-372. primitive brevirostrine large-sized pro- Gheerbrant, E., Sudre, J. & Cappetta, H. 1996. boscidean. With the help of the program Hen- A Palaeocene proboscidean from Morocco. nig86, a parsimony analysis of the features of Nature 383: 68-71. the new taxon with respect to other primitive Gheerbrant, E., Sudre, J., Cappetta, H. & Big- lophodont proboscideans supports its interme- not, G. 1998. Phosphatherium escuilliei du diate phylogenetic position between the basal Thanétien du bassin des Ouled Abdoun small Phosphatherium and the large, more de- (Maroc), plus ancien proboscidien (Mam- rived Numidotherium and Barytherium. Be- malia) d'Afrique. Geobios 30 2: 247-269. cause of several shared derived features, the Gheerbrant, E., Sudre, J., Iarochène, M. & new taxon would be a closer candidate to the Moumni, A. 2001a. First ascertained direct ancestry of Numidotherium than Phos- African “condylarth” mammals (primitive phatherium would be (hypothesis of Gheer- ungulates: cf. Bulbulodentata & cf. brant et al. 1996, 1998). However it appears al- Phenacodonta) from the Earliest Ypresian ready specialized with respect to N. koholense of the Ouled Abdoun Basin, Morocco. in some features, such as more molarized low- Journal of Vertebrate Paleontology 21: er premolars. The new Ouled Abdoun pro- 107-117. boscidean may represent the same basal radia- Gheerbrant, E., Sudre, J. & Iarochène, M. tion of “Barytherioidea” with Numidotherium, 2001b. New data on earliest African ungu- but its familial position (Numidotheriidae?) re- lates. 61st Annual Meeting, Bozeman, Mon- mains uncertain. The discovery of such a large tana, October 3-6, 2001, Abstract. Journal and derived proboscidean with respect to Phos- of Vertebrate Paleontology, in press. phatherium in the same old African beds points Gheerbrant, E., Sudre, J., Cappetta, H., out an unsuspected early diversity of pro- Iarochène, M., Amaghzaz, M. & Bouya, B. boscideans. It supports for the order Pro- in prep. Earliest large mammal from Africa boscidea (traditional concept, i.e. excluding (Ypresian, Morocco): Evidence of unex- Anthracobunidae) an African origin and its old pected early diversity of proboscideans. age, with at least late Paleocene roots. Acta Palaeontologica Polonica, submitted. 638.
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