• Source: Geosaurinae

Geosaurinae is a subfamily of metriorhynchid crocodyliforms from the Middle Jurassic to the Early Cretaceous (Bathonian - Aptian) of Europe, North America and South America. Named by Richard Lydekker, in 1889, it contains the metriorhynchids Suchodus, Purranisaurus, Neptunidraco, Tyrannoneustes, Torvoneustes, Dakosaurus, Geosaurus and Plesiosuchus. The last five taxa form a tribe within Geosaurinae, the Geosaurini. Geosaurinae is one of two subfamilies of Metriorhynchidae, the other being Metriorhynchinae.
These marine reptiles were widespread during the Late Jurassic and Early Cretaceous, their fossilized remains are being frequently found on various places around the world.




Phylogeny



Geosaurinae is a stem-based taxon defined in the PhyloCode in 2024 as the largest clade within Metriorhynchidae containing Geosaurus giganteus, but not Rhacheosaurus gracilis, Metriorhynchus brevirostris, and Gracilineustes leedsi. The derived tribe Geosaurini was named by Lydekker in 1889, and it is a node-based taxon defined in the PhyloCode by Mark T. Young and colleagues in 2024 as the smallest clade within Metriorhynchidae containing Tyrannoneustes lythrodectikos, Geosaurus giganteus, Torvoneustes carpenteri, and Dakosaurus maximus. There are many subclades within Geosaurini, namely Dakosaurina, Geosaurina, Plesiosuchina, and the lineage containing Torvoneustes and relatives. Geosaurina contains the genera Geosaurus and Ieldraan and defined in the PhyloCode as "the largest clade within Metriorhynchidae containing Geosaurus giganteus, but not Metriorhynchus brevirostris, Plesiosuchus manselii, Torvoneustes carpenteri, and Dakosaurus maximus". The clade Plesiosuchina contains Plesiosuchus and Suchodus and is defined in the PhyloCode as "the largest clade within Metriorhynchidae containing Plesiosuchus manselii, but not Metriorhynchus brevirostris, Geosaurus giganteus, Torvoneustes carpenteri, and Dakosaurus maximus". Most recently, the clade Dakosaurina was formally named and defined in the PhyloCode by Mark T. Young and colleagues in 2024 as "the largest clade within Metriorhynchidae containing Dakosaurus maximus, but not Metriorhynchus brevirostris, Geosaurus giganteus, Plesiosuchus manselii, and Torvoneustes carpenteri. The cladogram below follows the topology from a 2020 analysis by Young et al.




References

Kata Kunci Pencarian:

• Machimosaurus
• Geosaurinae
• Metriorhynchidae
• Dakosaurus
• Metriorhynchoidea
• Metriorhynchus
• Purranisaurus
• Plesiosuchus
• Tyrannoneustes
• Metriorhynchinae
• Enalioetes