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Description
Brachytrachelopan mesai ("Mesa's short-necked shepherd god") is a species of dicraeosaurid diplodocoid that lived in what is now Patagonia during the Late Jurassic. Its remains were found in the Canadon Calcareo Formation. It had the proportionally shortest neck known in any known sauropod, short even by dicraeosaurid standards, and its tall, anterior-leaning cervical neural spines would have had prevented it from raising its neck much beyond horizontal.

Missing portions were filled in using Dicraeosaurus.

Reconstructed dimensions
Hip height: ~2.23 metres
Shoulder height: ~2.03 metres
Total height: ~2.76 metres
Standing length: ~11 metres
Axial length: ~11.66 metres

References
Rauhut et al., 2005, "Discovery of a short-necked sauropod dinosaur from the Late Jurassic of Patagonia"
Rauhut & Lopez-Arbarello, 2008, "Archosaur evolution during the Jurassic: A Southern perspective"
Janensch, 1929, "Die Wirbelsäule der Gattung Dicraeosaurus"
Janensch, 1936, "Die Schädel der Sauropoden Brachiosaurus, Barosaurus und Dicraeosaurus aus den Tendaguru-Schichten Deutsch-Ostafrikas"
Janensch, 1961, "Die Gliedmaszen und Gliedmaszengürtel der Sauropoden der Tendaguru-Schichten"
Schwarz-Wings & Böhm, 2014, "A morphometric approach to the specific separation of the humeri and femora of Dicraeosaurus
from the Late Jurassic of Tendaguru, Tanzania"
Gallina et al., 2019, "A new long-spined dinosaur from Patagonia sheds light on sauropod defense system"
Photographs of mounted Dicraeosaurus skeleton (1 , 2 )

Update log
3/16/2018: Some tweaks to silhouette, teeth and scalebar updated to my new conventions.
1/24/2021: A major rework following my Dicraeosaurus reconstruction, allowing better cross-scaling and gapfilling. For comparison, the old version is here.
4/8/2022: Added clavicles and interclavicle.

Description
Brachytrachelopan mesai ("Mesa's short-necked shepherd god") is a species of dicraeosaurid diplodocoid that lived in what is now Patagonia during the Late Jurassic. Its remains were found in the Canadon Calcareo Formation. It had the proportionally shortest neck known in any known sauropod, short even by dicraeosaurid standards, and its tall, anterior-leaning cervical neural spines would have had prevented it from raising its neck much beyond horizontal.

Missing portions were filled in using Dicraeosaurus.

Reconstructed dimensions
Hip height: ~2.23 metres
Shoulder height: ~2.03 metres
Total height: ~2.76 metres
Standing length: ~11 metres
Axial length: ~11.66 metres

References
Rauhut et al., 2005, "Discovery of a short-necked sauropod dinosaur from the Late Jurassic of Patagonia"
Rauhut & Lopez-Arbarello, 2008, "Archosaur evolution during the Jurassic: A Southern perspective"
Janensch, 1929, "Die Wirbelsäule der Gattung Dicraeosaurus"
Janensch, 1936, "Die Schädel der Sauropoden Brachiosaurus, Barosaurus und Dicraeosaurus aus den Tendaguru-Schichten Deutsch-Ostafrikas"
Janensch, 1961, "Die Gliedmaszen und Gliedmaszengürtel der Sauropoden der Tendaguru-Schichten"
Schwarz-Wings & Böhm, 2014, "A morphometric approach to the specific separation of the humeri and femora of Dicraeosaurus
from the Late Jurassic of Tendaguru, Tanzania"
Gallina et al., 2019, "A new long-spined dinosaur from Patagonia sheds light on sauropod defense system"
Photographs of mounted Dicraeosaurus skeleton (1 , 2 )

Update log
3/16/2018: Some tweaks to silhouette, teeth and scalebar updated to my new conventions.
1/24/2021: A major rework following my Dicraeosaurus reconstruction, allowing better cross-scaling and gapfilling. For comparison, the old version is here.
4/8/2022: Added clavicles and interclavicle.