Project 3673: G. A. de Souza, M. B. Soares, A. S. Brum, M. Zucolotto, J. Sayao, L. C. Weinschutz, A. W. A. Kellner. 2020. Growth dynamics and osteohistology of the Brazilian noasaurid Vespersaurus paranaensis Langer et al., 2019 (Theropoda: Abelisauroidea). PeerJ. (In Press)
Specimen: † Vespersaurus paranaensis (CP/V:4130)
View: Cross section of tibia


Although the knowledge of bone histology of non-avian theropods has advanced considerably in recent decades, data about the bone tissue patterns, growth dynamics, and ontogeny of some taxa such as abelisauroids are still limited. Here we describe the bone microstructure and growth dynamics of the Brazilian noasaurine Vespersaurus paranaensis using five femora and eight tibiae and quantify the annual growth marks through retrocalculation of missing ones to estimate ontogenetic ages. The femoral series comprises four femoral histological classes (FHC I-IV), varying from two annuli or LAGs to seven LAGs. Femora show that sexual maturity was achieved around the seventh to tenth year of life, whereas the tibiae suggest it was earlier (around three to five years old). Tibiae represent three histological classes (THC I-III) displaying from three to nine LAGs. Two tibiae (THC III) exhibit an external fundamental system indicating that these specimens reached full skeletal size. The heterogeneous maturity observed in Vespersaurus hind limb bones could result from differential allometry scaling between femora and tibiae length with the body length. The predominant parallel-fibered bone matrix suggests that Vespersaurus grew more slowly than most theropods, including other abelisauroids, in a pattern shared with the noasaurines Masiakasaurus knopfleri from Madagascar and CPPLIP 1490 from Brazil. This deviation from the typical theropod growth pattern may be mainly correlated with small body size, but also may related to resource limitation imposed by the arid climate prevailing in Gondwana during Cretaceous. Moreover, given the ecological and phylogenetic similarities among these taxa, such features would probably be apomorphic within Noasauridae.

Project DOI: 10.7934/P3673,
This project contains
  • 16 Media
  • 1 Taxon
  • 13 Specimens
Total size of project's media files: 155.05M

Download Project SDD File
Currently Viewing:
MorphoBank Project 3673

    Authors' Institutions

    • Universidade Federal do Rio De Janeiro (UFRJ)


    member name taxa specimens media media
    Geovane Souza
    Project Administrator
    Last logged in 08/25/20
    Marina Soares
    Last logged in Never

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views153
    Project overview39
    Media views79Media search (27 views); M687028 (7 views); M687030 (3 views); M687032 (3 views); M687033 (3 views); M687034 (3 views); M687035 (3 views); M687036 (3 views); M687037 (3 views); M687038 (3 views); M687039 (3 views); M687040 (3 views); M687041 (3 views); M687042 (3 views); M687333 (3 views); M687334 (3 views); M687335 (3 views);
    Taxon list6
    Specimen list19
    Views for media list5

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project3
    Project downloads2
    Media downloads1M687028 (1 download);