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Allodaposuchus
''Allodaposuchus'' is an extinct genus of crocodylians that includes four species that lived in what is now southern Europe during the Campanian and Maastrichtian stages of the Late Cretaceous. Until recently classified as a non-crocodylian crocodylomorph, it is now placed as one of the earliest true crocodylians by most phylogenetic studies. ''Allodaposuchus'' is one of the most common Late Cretaceous crocodylomorphs from Europe, with fossils known from Spain, Romania, and France.
== Description ==
Like many other Cretaceous crocodylomorphs, ''Allodaposuchus'' has a relatively small body size compared to living crocodylians. The largest known specimen of ''Allodaposuchus'' belongs to an individual that was probably around long. Although the shape varies between species, in general ''Allodaposuchus'' has a short, flattened, and rounded skull. ''Allodaposuchus precedens'' has a brevirostrine or "short-snouted" skull with a snout about the same length as the skull table (the region of the skull behind the eye sockets) and ''A. subjuniperus'' has a mesorostrine or "middle-snouted" skull with a snout that is longer than the skull table.〔 The main feature that distinguishes ''Allodaposuchus'' species from other related crocodylomorphs is the orientation of a groove at the back of the skull called the cranioquadrate passage; unlike the cranioquadrate passages of other crocodylomorphs, which are only visible at the back of the skull, the cranioquadrate passage of ''Allodaposuchus'' is visible when the skull is viewed from the side.
At least one species of ''Allodaposuchus'', ''A. hulki'', may have adaptations that would have allowed it to live on land for extended periods of time. ''A. hulki'' has large sinuses in its skull that are not seen in any other crocodylian living or extinct and may have aided it in hearing out of water, as well as lightening the skull. Moreover, ''A. hulki'' has well-developed muscle attachments on its scapula, humerus, and ulna bones that would have allowed the forelimbs to have been held in a semi-erect stance suitable for walking over land. Remains of ''A. hulki'' come from interbedded sandstones and marls that, based on the presence of charophyte algae, likely formed in ephemeral ponds in a large floodplain far from permanent bodies of water like lakes or rivers. ''A. hulki'' may therefore have spent much of its time out of water, travelling between these ponds for food.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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