[dinosaur] Probelesodon and Massetognathus (Cynodontia) brain endocasts

Ben Creisler
[email protected]

A new paper:



Carolina A. Hoffmann, P. G. Rodrigues, M. B. Soares & M. B. de Andrade
(2019)
Brain endocast of two non-mammaliaform cynodonts from southern Brazil: an
ontogenetic and evolutionary approach.
Historical Biology (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_08912963.2019.1685512&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=BEejukrKEHIH7AyUBD6OgH1zDNDbhNGDfDGczxLbOj4&s=OTI-pA_NaZPO8l6FsmXPW3SPw9FOFws1OK8fGNHv1qk&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_08912963.2019.1685512&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=BEejukrKEHIH7AyUBD6OgH1zDNDbhNGDfDGczxLbOj4&s=wkShHoIgxtidEgIgV2tFIZw0pat0FcvZs94Mfy0XDPA&e= 


Computed tomography is a non-destructive method that facilitates the
accurate analysis of the internal structures of fossils. Several
paleoneurological studies concerning derived non-mammaliaform cynodonts,
mammaliaforms and basal mammals using this technique have been published.
However, little remains known regarding the brain anatomy of basal
Cynodontia. Thus, it is relevant to increase knowledge concerning the basal
members of this clade to obtain a better understanding of brain evolution
during the descent of mammals from non-mammaliaform cynodonts. Therefore,
the present study involved analysing the digital endocasts of two
non-mammaliaform cynodonts (Probelesodon kitchingi and Massetognathus
ochagaviae). To assess the rate of brain development, the encephalisation
quotients for these species were calculated and compared with previous
data. Compared to a previous study on the brain endocasts of Probelesodon
sp. and Massetognathus sp. from Argentina, digital endocasts of the
Brazilian specimens revealed new brain morphology features for these
genera. Additionally, the 3D digital endocasts and EQ estimates are
relevant for assessing intraspecific variation and possible ontogenetic
changes in these fossil taxa.




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