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Diplodocoidea is a superfamily of sauropod dinosaurs, which included some of the longest animals of all time, including slender giants like Supersaurus, Diplodocus, Apatosaurus, and Amphicoelias. Most had very long necks and long, whip-like tails; however, one family (the dicraeosaurids ) are the only known sauropods to have re-evolved a short ...
[32] [35] Amphicoelias was traditionally considered a diplodocid due to its similar anatomy, but phylogenetic studies showed it to be a more basal member of the Diplodocoidea. [32] The relationships of species within Diplodocidae has also been subject to frequent revision.
[54] [55] Diplodocoidea comprises the diplodocids, as well as the dicraeosaurids, rebbachisaurids, Suuwassea, [52] [53] Amphicoelias [55] possibly Haplocanthosaurus, [56] and/or the nemegtosaurids. [57] The clade is the sister group to Macronaria (camarasaurids, brachiosaurids and titanosaurians). [56] [57]
Diplodocoidea is defined as all neosauropods more closely related to Diplodocus longus than Saltasaurus loricatus. The group is named after Diplodocus, its best known member. Other prominent dinosaurs contained in this clade include Apatosaurus, Supersaurus, and Brontosaurus. Diplodocoids are distinguished by a unique head shape, which displays ...
Articles relating to the Diplodocoidea, a superfamily of sauropod dinosaurs, which included some of the longest animals of all time, including slender giants like Supersaurus, Diplodocus, Apatosaurus, and Amphicoelias.
Galeamopus is a genus of herbivorous diplodocid sauropod dinosaurs.It contains two known species: Galeamopus hayi, known from the Late Jurassic lower Morrison Formation (Kimmeridgian age, about 155 million years ago) of Wyoming, United States, and Galeamopus pabsti, known from the Late Jurassic fossils from Wyoming and Colorado.
In their 2024 description of the taxon, van der Linden and colleagues refrained from including a phylogenetic analysis, stating that the description is part of an ongoing project to investigate the systematics of the much broader clade Diplodocoidea. They mention that a collaborative phylogeny will be published in the future, which will include ...
Although all authorities agree that the rebbachisaurids are members of the superfamily Diplodocoidea, they lack the bifid (divided) cervical neural spines that characterise the diplodocids and dicraeosaurids, and for this reason are considered more primitive than the latter two groups. It is not yet known whether they share the distinctive whip ...