Biology:Kryptohadros
Kryptohadros (lit. hidden hadrosauroid) is an extinct genus of hadrosauroid ornithopod dinosaur known from the Late Cretaceous (Maastrichtian age) Densuș-Ciula Formation of Romania. The genus contains a single species, Kryptohadros kallaiae, known from a partial skull and skeleton. Phylogenetic analyses revealed Kryptohadros is closely related to the coeval Transylvanian Telmatosaurus and the Italian Tethyshadros, together forming a group of southeastearn European-endemic taxa, called the Telmatosauridae. Kryptohadros is the second named non-hadrosaurid hadrosauroid from the Hațeg Basin, following Telmatosaurus, which was named by Franz Nopcsa in 1903.[1]
Discovery and naming
The Kryptohadros holotype specimen, LPB [FGGUB] R.2882, was discovered between 2022 and 2024 in the Fântânele-3 site of the uppermost Densuș-Ciula Formation in the westernmost part of Hunedoara County, Romania. The associated fossil material preserves a partial skull, dorsal rib fragments, caudals, neural spine fragment, chevrons, and a partial hindlimb. The fused vertebral column elements and the size of the known material indicate that the fossil belongs to an individual that at least reached a subadult stage.[1]
In 2026, János Magyar and colleagues described this incomplete skeleton as a new genus and species of hadrosauroid, Kryptohadros kallaiae. The generic name, Kryptohadros, is derived from the Ancient Greek words κρυπτός (kryptós, "hidden"), regarding its presence as a second hadrosauroid taxon of the Hațeg Basin in close proximity to a previously known fossil locality being unrecognized for decades, and ἁδρός (hadrós, "thick" or "bulky"), which is often used to name hadrosauroids. The specific name, kallaiae, honors Magyar's mother, Csilla Kállai.[1]
Classification
To test the relationships and affinities of Kryptohadros, Magyar and colleagues included it in an updated version of the phylogenetic matrix of Longrich et al. (2024)[2] and the similar but less extensive matrix of Dai et al. (2025).[3] Both datasets consistently recovered Kryptohadros as the sister taxon to the Italian genus Tethyshadros. Telmatosaurus, another genus from Hațeg Basin coeval with Kryptohadros, was recovered as the sister to these two taxa using both datasets. Magyar et al. named the group containing these three genera as the new clade Telmatosauridae. The results of the majority rule consensus analysis from the former matrix are displayed in the cladogram below:[1]
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References
- ↑ 1.0 1.1 1.2 1.3 Magyar, J.; Ősi, A.; Csiki-Sava, Z.; Budai, S.; Botfalvai, G. (2026). "New early Maastrichtian 'duck-billed' dinosaur from Hațeg Basin (Densuș-Ciula Formation, Romania) documents an endemic clade of non-hadrosaurid hadrosauroids in the south-eastern Late Cretaceous European Archipelago". Journal of Systematic Palaeontology 24 (1). doi:10.1080/14772019.2025.2607800. https://www.tandfonline.com/doi/full/10.1080/14772019.2025.2607800.
- ↑ Longrich, N. R.; Pereda-Suberbiola, X.; Bardet, N.; Jalil, N.-E. (2024). "A new small duckbilled dinosaur (Hadrosauridae: Lambeosaurinae) from Morocco and dinosaur diversity in the late Maastrichtian of North Africa". Scientific Reports 14 (1): 3665. doi:10.1038/s41598-024-53447-9. PMID 38351204. Bibcode: 2024NatSR..14.3665L.
- ↑ Dai, Hui; Ma, Qingyu; Xiong, Can; Lin, Yu; Zeng, Hui; Tan, Chao; Wang, Jun; Zhang, Yuguang et al. (February 2025). "A new late-diverging non-hadrosaurid hadrosauroid (Dinosauria: Ornithopoda) from southwest China: support for interchange of dinosaur faunas across East Asia during the Late Cretaceous". Cretaceous Research 166 (in press). doi:10.1016/j.cretres.2024.105995. ISSN 0195-6671. Bibcode: 2025CrRes.16605995D. https://linkinghub.elsevier.com/retrieve/pii/S019566712400168X.
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