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 neck, presumably an adaptation for feeding low to the ground. This adaptation was taken to the extreme in the highly specialized sauropod Brachytrachelopan. A study of snout shape and dental microwear in diplodocoids showed that the square snouts, large proportion of pits, and fine subparallel scratches in Apatosaurus, Diplodocus, Nigersaurus, and Rebbachisaurus suggest ground-height nonselective browsing; the narrow snouts of Dicraeosaurus, Suuwassea, and Tornieria and the coarse scratches and gouges on the teeth of Dicraeosaurus suggest mid-height selective browsing in those taxa.[2] This taxon is also noteworthy because diplodocoid sauropods had the highest tooth replacement rates of any vertebrates, as exemplified by Nigersaurus, which had new teeth erupting every 30 days.[3]

Temporal range: Middle JurassicLate Cretaceous, 174–93 Ma Possible Turonian Record [1]
Skeletons of Apatosaurus and Diplodocus
Holotype skeletons of Diplodocus carnegii and Apatosaurus louisae, Carnegie Museum of Natural History
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Sauropodomorpha
Clade: Sauropoda
Clade: Neosauropoda
Superfamily: Diplodocoidea
Marsh, 1884
Type species
Diplodocus longus
Marsh, 1878

Most diplodocoids belong to Diplodocimorpha, a name first used by Calvo & Salgado (1995), who defined it as "Rebbachisaurus tessonei sp. nov., Diplodocidae, and all descendants of their common ancestor." The group was not used often, and was synonymized with Diplodocoidea as the groups were often found to have the same content. In 2005, Mike P. Taylor and Darren Naish reviewed diplodocoid phylogeny and taxonomy, and realized that Diplodocimorpha could not be synonymized with Diplodocoidea. Whereas the former was defined node-based, the latter was branch-based.[4] Haplocanthosaurus and possibly Amphicoelias are non-diplodocimorph diplodocoids.[5]

Taxonomy edit

The below taxonomy follows the study of Emanuel Tschopp, Octavio Mateus and Roger Benson, 2015:[6]

The phylogenetics of Diplodocoidea were reviewed in 2015 with a specimen-level phylogenetic analysis, as well as a species-level analysis. Their cladistic analysis is shown below.[6]


Haplocanthosaurus priscus  


Zapalasaurus bonapartei


Cathartesaura anaerobica

Limaysaurus tessonei


Nigersaurus taqueti  

Demandasaurus darwini


Dyslocosaurus polyonychius

Suuwassea emilieae

Dystrophaeus viaemalae

Brachytrachelopan mesai  

Tharosaurus indicus  

Amargasaurus cazaui  

Dicraeosaurus hansemanni  


Amphicoelias altus


?Apatosaurinae gen. et sp. nov.

Apatosaurus ajax  

Apatosaurus louisae  

Brontosaurus excelsus  

Brontosaurus yahnahpin

Brontosaurus parvus  


?Diplodocinae gen. et sp. nov.

Tornieria africana

Supersaurus lourinhanensis

Supersaurus vivianae  

Leinkupal laticauda

Galeamopus hayi

Diplodocus carnegiei  

Diplodocus hallorum

Kaatedocus siberi

Barosaurus lentus

References edit

  1. ^ Averianov, Alexander; Sues, Hans-Dieter (2021). "First rebbachisaurid sauropod dinosaur from Asia". PLOS ONE. 16 (2): e0246620. doi:10.1371/journal.pone.0246620. PMC 7904184. PMID 33626060.
  2. ^ John A. Whitlock (6 April 2011) Inferences of Diplodocoid (Sauropoda: Dinosauria) Feeding Behavior from Snout Shape and Microwear Analyses
  3. ^ Sereno, PC; Wilson, JA; Witmer, LM; Whitlock, JA; Maga, A; et al. (2007). "Structural Extremes in a Cretaceous Dinosaur". PLOS ONE. 2 (11): e1230. doi:10.1371/journal.pone.0001230. PMC 2077925. PMID 18030355.
  4. ^ Taylor, M.P.; Naish, D. (2005). "The phylogenetic taxonomy of Diplodocoidea (Dinosauria: Sauropoda)" (PDF). PaleoBios. 25 (2): 1–7.
  5. ^ Mannion, Philip D.; Tschopp, Emanuel; Whitlock, John A. (2021-06-16). "Anatomy and systematics of the diplodocoid Amphicoelias altus supports high sauropod dinosaur diversity in the Upper Jurassic Morrison Formation of the USA". Royal Society Open Science. 8 (6): 210377. doi:10.1098/rsos.210377. ISSN 2054-5703.
  6. ^ a b Tschopp, E.; Mateus, O.; Benson, R.B.J. (2015). "A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda)". PeerJ. 3: e857. doi:10.7717/peerj.857. PMC 4393826. PMID 25870766.{{cite journal}}: CS1 maint: unflagged free DOI (link)