#tietasaura

[misterrogers22]

Dinosaurs Lately - Ep 8 Hadrosauroids

The latest Dinosaurs Lately podcast https://dinosaurslately.blogspot.com/2026/01/episode-8-hadrosauroids-winter-2026.html targeting Hadrosauroids is out, trying to catch you up on everything that’s been published on them … lately.

#dinosaurs

A reassessment of the historical fossil findings from Bahia State (Northeast Brazil) reveals a diversified dinosaur fauna in the Lower Cretaceous of South America Bandeira, K.L.N. et al. (2024). doi: 10.1080/08912963.2024.2318406

Neonatal state and degree of necessity for parental care in Maiasaura based on inferred neonatal metabolic rates. Bert, H., et al. (2025). doi: https://doi.org/10.1038/s41598-025-06282-5

First Population Analysis in Hadrosauroid dinosaurs (Ornithopoda: Iguanodontia: Hadrosauroidea). Javier, J.M.F., et al. (2025). DOI: https://doi.org/10.1016/j.eve.2025.100072

Inside a duck-billed dinosaur: Vertebral bone microstructure of Huallasaurus (Hadrosauridae), Upper Cretaceous of Patagonia. Aureliano, T., et al. (2025). doi: https://doi.org/10.1002/ar.70040

Disparate feeding mechanics between two hadrosaurid dinosaurs support the potential for resource partitioning. Dudgeon, T.W., et al. (2025). doi: https://doi.org/10.1098/rspb.2025.0921

A new saurolophine hadrosaurid (Ornithischia: Hadrosauridae) from the Upper Cretaceous (Campanian) Hunter Wash Member, Kirtland Formation, San Juan Basin, New Mexico. Dalman, S.G., et al. (2025). https://www.researchgate.net/publication/396005330_A_new_saurolophine_hadrosaurid_Ornithischia_Hadrosauridae_from_the_Upper_Cretaceous_Campanian_Hunter_Wash_Member_Kirtland_Formation_San_Juan_Basin_New_Mexico

The Holotypes of Patagonichornis venetiorum Casamiquela 1996 and Tridigitichnus inopinatus Casamiquela 1996 Vertebrate Ichnotaxa (Late Cretaceous, Patagonia): History and Patrimonial Significance. Díaz-Martínez, I., et al, (2025). https://doi.org/10.1007/s12371-025-01211-4

Deciphering causes and behaviors: A recurrent pattern of tail injuries in hadrosaurid dinosaurs. Bertozzo, F. et al., (2025). doi: https://doi.org/10.1016/j.isci.2025.113739

A new small duckbilled dinosaur (Hadrosauridae: Lambeosaurinae) from Morocco and dinosaur diversity in the late Maastrichtian of North Africa. Longrich, N.R., et al. (2024). DOI: 10.1038/s41598-024-53447-9

[new-dinosaurs]

Tietasaura derbyiana Bandeira et al., 2024 (new genus and species)

(Type femur [thigh bone] of Tietasaura derbyiana [scale bar = 100 mm], from Bandeira et al., 2024)

Meaning of name: Tietasaura = [nickname for Antonieta, the main character of the novel Tieta do Agreste by Jorge Amado; the name Antonieta also means "priceless", referring to the value of the specimen] Tieta's lizard [in Greek]; derbyiana = for Orville A. Derby [founder and first director of the Brazilian Mineralogical and Geological Commission and former director of the National Museum of Rio de Janeiro]

Age: Early Cretaceous (Valanginian–Hauterivian)

Where found: Marfim Formation, Bahia, Brazil

How much is known: A partial left femur (thigh bone).

Notes: Tietasaura was an ornithopod, a group of plant-eating dinosaurs that includes the duck-billed hadrosaurids. However, it was only distantly related to the hadrosaurids, instead being a member of Elasmaria, a diverse group of small to medium-sized ornithopods from the Southern Hemisphere. Tietasaura is the first ornithischian ("bird-hipped") dinosaur to be named from Brazil.

The type specimen of Tietasaura was collected in 1906, but remained scientifically undescribed until now. It was originally labeled as a specimen of Hyposaurus, a seagoing, crocodile-like fossil reptile, and has only been recognized as a dinosaur following more detailed study.

Reference: Bandeira, K.L.N., B.A. Navarro, R.V. Pêgas, N.S. Brilhante, A.S. Brum, L.G. de Souza, R.C. da Silva, and V. Gallo. 2024. A reassessment of the historical fossil findings from Bahia State (Northeast Brazil) reveals a diversified dinosaur fauna in the Lower Cretaceous of South America. Historical Biology advance online publication. doi: 10.1080/08912963.2024.2318406