[dinosaur] Flying archosaur brain shape evolution (free pdf)

Ben Creisler
[email protected]

A new paper in open access:

Vincent Beyrand, Dennis F. A. E. Voeten, Stanislav Bureš, Vincent
Fernandez, Jiří Janáček, Daniel Jirák, Oliver Rauhut & Paul Tafforeau (2019)
Multiphase progenetic development shaped the brain of flying archosaurs.
Scientific Reports 9, Article number: 10807
DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1038_s41598-2D019-2D46959-2D2&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=THWgih0175ze29RCaTItjChFThi1yDq4fUnm3A2uyus&s=i-ht_d6h8IOR8uL7SOBASrMDgD_cxgtp_lwUqGccxiM&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.nature.com_articles_s41598-2D019-2D46959-2D2&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=THWgih0175ze29RCaTItjChFThi1yDq4fUnm3A2uyus&s=GHj0aR22QQPnkcFDMpFqNmTDTn8DXeYAzR3E4KpHCFk&e= 
Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.nature.com_articles_s41598-2D019-2D46959-2D2.pdf&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=THWgih0175ze29RCaTItjChFThi1yDq4fUnm3A2uyus&s=YOjQjHAKfuc7AdtAEsOSkDT89XWrX_hEA1s3a_Fldh4&e= 

The growing availability of virtual cranial endocasts of extinct and extant
vertebrates has fueled the quest for endocranial characters that
discriminate between phylogenetic groups and resolve their neural
significances. We used geometric morphometrics to compare a
phylogenetically and ecologically comprehensive data set of archosaurian
endocasts along the deep evolutionary history of modern birds and found
that this lineage experienced progressive elevation of encephalisation
through several chapters of increased endocranial doming that we
demonstrate to result from progenetic developments. Elevated
encephalisation associated with progressive size reduction within
Maniraptoriformes was secondarily exapted for flight by stem avialans.
Within Mesozoic Avialae, endocranial doming increased in at least some
Ornithurae, yet remained relatively modest in early Neornithes. During the
Paleogene, volant non-neoavian birds retained ancestral levels of endocast
doming where a broad neoavian niche diversification experienced
heterochronic brain shape radiation, as did non-volant Palaeognathae. We
infer comparable developments underlying the establishment of pterosaurian
brain shapes.

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