|mhorn||Дата: Thursday, 04.09.2014, 16:57 | Сообщение # 1|
|Fuchs D. (2014) First evidence of Mastigophora (Cephalopoda: Coleoidea) from the early Callovian of La Voulte-sur-Rhône (France) // Göttinger Contributions to Geosciences. Vol.77. P. 21-27. |
A 3-dimensionally preserved coleoid cephalopod from the Lower Callovian La Voulte-sur-Rhône lagerstätte is described. The comparison with Mastigophora brevipinnis from the Upper Callovian Oxford Clay of Christian Malford (U.K.) revealed remarkable similarities in their soft part morphologies. The shared presence of conspicuously short arms, one pair of near-terminal and ear-shaped fins, and an unusual thickening of the anterior mantle margin led the author to determine the specimen under investigation as Mastigophora aff. brevipinnis. The presence of uniserial and ringless suckers in Mastigophora aff. brevipinnis support a phylogenetic relationship with the Vampyropoda rather than with the Decabrachia. The previously discussed presence or non-presence of tentacles in Mastigophora is re-evaluated.
Middle Jurassic - Lower Cretaceous ammonites & aptychi