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PYCNONEMOSAURUS

a meat-eating abelisaurid theropod dinosaur from the Late Cretaceous of Brasil.
Pronunciation: PYK-no-NEE-mo-SOR-us
Meaning: Thick Forest Lizard
Author/s: Kellner and Campos (2001)
Synonyms: None known
First Discovery: Mato Grosso, Brazil
Chart Position: 402

Pycnonemosaurus nevesi

Pycnonemosaurus was coined in 2002 by Alexander Kellner and Diógenes de Almeida Campos who announced it as the best-known abelisaurid from Brasil, which sounds glorious... but isn't. Apart from the informally-named "Cambará theropod" which may or not belong to the same family, Pycnonemosaurus is the only known abelisaurid from Brazil, with remains amounting to a mere handful of teeth, seven lumps of vertebrae, a hipbone and a couple of lower leg bones, one of which — a tibia or shin — suffered "preservational problems" and was clumsily plastered and glued prior to description. Still, by process of elimination the authors weren't fibbing, and it is unique amongst its kind in sporting a small pubic foot and a hatchet-shaped cnemial crest on the front-side head of its shin which anchors the extensor muscle of the thigh. Pycnonemosaurus is also the largest abelisaurid known from anywhere, based on Grillo and Delcourt's latest method for extrapolating total body size from fragmentary fossils.
(Neves' thick forest lizard)Etymology
Pycnonemosaurus is derived from the Greek "pycnós" (thick), "nemos" (forest) and "sauros" (lizard), in reference to the Brazilian State of Mato Grosso (meaning "thick forest" in Portuguese, the official language of Brazil) where it was discovered. The species epithet, nevesi, honors Iedo Batista Neves.
Discovery
The remains of Pycnonemosaurus were found on Max de Barros Erhart's ranch "Fazenda Roncador" in the Adamantina Formation (Bauru Group), Paulo Creek, Cambebé area, Bauru Basin, Mato Grosso State, Brazil, by Llewellyn Ivor Price way back in 1952/53, mingled with titanosaur bones.
The holotype (DGM 859-R) includes five incomplete teeth, parts of seven tail vertebrae, one piece of hip bone (the right pubis), a right shinbone (tibia), and a piece of the right calfbone (fibula).
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Turonian-Santonian
Age range: 94-84 mya
Stats:
Est. max. length: 9 meters
Est. max. hip height: 2.5 meters
Est. max. weight: 2.5 tons
Diet: Carnivore
References
• Kellner A and Campos D de A (2002) "On a theropod dinosaur (Abelisauria) from the continental Cretaceous of Brazil". Arquivos do Museu Nacional (Rio de Janeiro) 60:(3), pages 163-170
• Carrano MT and Sampson SD (2008) "The Phylogeny of Ceratosauria". Journal of Systematic Palaeontology 6 (2): 183–236. doi:10.1017/S1477201907002246.
• Paul GS (2010) "The Princeton Field Guide to Dinosaurs". Page 79. Princeton University Press.
• Machado EB, Campos D de A, Calvo JO and Kellner AWA (2013 "A new Abelisauroid from the Upper Cretaceous of Brazil". Revista Mexicana de Ciencias Geológicas 30(2):446-452
• Grillo ON and Delcourt R (2016) "Allometry and body length of abelisauroid theropods: Pycnonemosaurus nevesi is the new king". Cretaceous Research, Volume 69, Pages 71–89.
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To cite this page:
Atkinson, L. "PYCNONEMOSAURUS :: from DinoChecker's dinosaur archive".
›. Web access: 30th May 2017.
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