Theriosuchus is an extinct genus of atoposaurid mesoeucrocodylian from the Late Jurassic of Europe, the Early Cretaceous of Asia and the Late Cretaceous of Romania. The five species are T. pusillus from England (Owen, 1879), T. ibericus from Spain (Brinkmann, 1992), T. guimarotae from Portugal (Schwarz & Salisbury, 2005), T. sympiestodon from Romania (Jeremy E. Martin, Márton Rabi & Zoltán Csiki, 2010) and T. grandinaris from Berriasian-Barremian of Thailand (Lauprasert et al., 2011).

 Theriosuchus was a common terrestrial mesoeucrocodylian in Europe during the Cretaceous. Fossils belonging to the genus are abundant at several European sites. It was one of the few basal mesoeucrocodylians to exist in Laurasia during the Late Cretaceous, a time when many basal forms such as notosuchians and araripesuchids were present in Gondwana. Some other basal mesoeucrocodylians present in Europe at this time were Doratodon and Ischyrochampsa.

 There is a 58-million-year gap in the fossil record of the genus that spans between the last occurrence of Early Cretaceous species and the appearance of the Late Cretaceous T. sympiestodon. Described in 2010, T. sympiestodon was found in the Haţeg Basin of Romania. During the Late Cretaceous, this area was part of Haţeg Island, which was part of an archipelago that spanned the Tethys Ocean.

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Tags: Вымершие рептилии, Мел, архозавроморфы, архозавры, атопозавриды, диапсиды, крокодиломорфы, круротарзы, мезоэукрокодилии, неозухии, равизухии

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 Montsecosuchus is an extinct genus of atoposaurid crocodylomorph. It is the replacement generic name for Alligatorium depereti, which was described in 1915 from the Montsec Lithographic Limestone quarry of Spain. Fossils found from this locality are from the Early Cretaceous, being Upper Berriasian-Lower Valanginian in age. While many publications concerning atoposaurids after 1915 have included mentions of A. depereti, none have offered a redescription or revision of the species, even though some recognized that there were great differences between it and other members of the genus. It was noted in these publications that the skull of A. depereti was shorter in relation to body length than any other species of Alligatorium (being less than half of the presacral length), and that this may have been evidence for the genetic distinction of the species, although no replacement name was proposed. However, better preparation of the holotype specimen MGB 512, a nearly complete articulated skeleton embedded in a limestone matrix now housed in the Museo de Geología del Ayuntameinto de Barcelona, allowed for a revision of the species in 1990 in which the name Montsecosuchus was first used.

 Montsecosuchus differs in several ways from other atoposaurids such as Alligatorium, Alligatorellus, and Theriosuchus. Several characteristics of the skull including the presence of an ungrooved parietal-squamosal suture and a caudally projecting retroarticular process distinguish Montsecosuchus from these genera. Both Montsecosuchus and Alligatorellus possess three sacral vertebrae: this may be a shared synapomorphy of the two genera. The shortness of the radius is an autapomorphy of the genus that is not seen in any other atoposaurid, although it is common in more derived crocodylomorphs.

 Atoposauridae is a family of crocodile-like archosaurs. Members of the family have been found from France, Spain, Portugal, Romania, Germany, Kazakhstan, the United Kingdom, the United States, Cameroon, and Thailand.

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Tags: Вымершие рептилии, Мел, архозавроморфы, архозавры, атопозавриды, диапсиды, крокодиломорфы, круротарзы, мезоэукрокодилии, неозухии, равизухии

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