Aequiloboidea A new Early Jurassic ammonite superfamily of the Mediterranean Tethys

A comprehensive outline of the Jurassic ammonoid superfamily Aequilobordea is here presented this group is known from? Rhaetian-early Hettangran to early Pliensbachi in and it is exclusively found within the Mediteriane in Tethys (Austin in Alps Bavarian Prealps Tuscany Umbria Mirche and Abruzzi Apennines Morocco Tunisia western Hung try) On the basis of the available documentation it is composed by two families (Acquilobidie and Sinuiceratidae) to which live genera belong Acqilobus Bilotta (previously informally indicated as genus from Monte Bove ') Dudresnayiceras Rikus Simaccras Venturi and Fern and Sphenoacanthites Venturi Nannarone and Bilotta plus Xenoloboceras nov gen which position at the faintly level IN uncertain All of them share a peculiar combination of morph structural characters which was never observed in my form referable to known groups Due to the particularities presented by the Aequiloboidea and to the scarce documentation on the e tritest Jurassic in the Mediterranean regions it is currently impossible to demonstrate that this taxon originated within any of the already known Jurassic ammonoid orders (Phylloceratid and and Psiloceratida) An atleast partially Independent derivation cannot be excluded is suggested also by the results of a cladistic analysis (C) 2010 Elsevier Masson SAS All rights reserved