Ontogeny and miniaturization of Alvarezsauridae (Dinosauria, Theropoda)

  • Alexander Averianov Zoological Institute, Russian Academy of Sciences, Universitetskaya nab., 1, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0001-5948-0799
  • Pavel Skutschas Department of Vertebrate Zoology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0001-8093-2905
  • Alexey Lopatin Borissiak Paleontological Institute, Russian Academy of Sciences, ul. Profsoyuznaya, 123, Moscow, 117647, Russian Federation https://orcid.org/0000-0003-1913-0537


The ontogenetic status of the known specimens of alvarezsaurid theropod dinosaurs is revised. We present histological data that the holotype of Parvicursor remotus from the Upper Cretaceous Barungoyot Formation of Mongolia is not an adult individual, as previously thought, but a juvenile less than one year old. The miniaturization took place only in the Late Cretaceous Asiatic Parvicursorinae, whereas the Late Cretaceous South American non-parvicursorine alvarezsaurids were large animals. The miniaturization occurred by shifting ossification to earlier ontogenetic stages, in particular, by the closure of the neurocentral sutures on the presacral vertebrae of juvenile animals. There is no morphological support for the myrmecophagy in the alvarezsaurids and a shift to a myrmecophagous ecological niche does not explain the need for miniaturization.


Dinosauria, Theropoda, Alvarezsauridae, ontogeny, miniaturization


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How to Cite
Averianov, A., Skutschas, P., & Lopatin, A. (2023). Ontogeny and miniaturization of Alvarezsauridae (Dinosauria, Theropoda). Biological Communications, 68(2), 65–73. https://doi.org/10.21638/spbu03.2023.201
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