Sur la présence d'un ancètre probable des Oiseaux dans le Muschelkalk supérieur de Catalogne (Espagne). Note préliminaire

Abstract

A small reptile from the upper Musclielkalk levels in the area of híotitral, near Alcover, province of Tarragona, is provisionally described in this paper. This reptile has a series of characteristics specially in the skull, which enable us to consider it as a proto-bird and for which we suggest the new denomination of: " Crosesaurus aviceps, nov. gen. nov. sp.". Firstly \ve give the main characteristics of the different groups of proto-birds which are, in general, recognizable by their footprints in the Keuper of Stormberg (Lesotho).