Open Paleo

Kryptohadros

Magyar et al., 2026 KRIP-toh-HAD-ros

From Ancient Greek "kryptos" (hidden) and "hadros" (thick or bulky, commonly used in hadrosauroid names); meaning "hidden hadrosauroid".

72.2–66.0 million years ago Maastrichtian, Late Cretaceous
Late Cretaceous stages

Kryptohadros 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 southeastern 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.

Under dispute

Kryptohadros kallaiae is a non-hadrosaurid hadrosauroid described by Magyar and colleagues (2026), who recovered it with Telmatosaurus and Tethyshadros in a newly named clade, Telmatosauridae, outside Hadrosauridae.

Diagnosis

  1. Posterior edge of the coronoid process bears a well-developed triangular lobe extending posteriorly
  2. Surangular bears both a surangular foramen and a glenoid foramen
  3. Jugal process of the maxilla bears five small jugal tubercles that gradually decrease in size from the ventral-most to the dorsal-most
  4. Well-developed buccal shelf along the laterodorsal edge of the dentary
  5. Meckelian canal reaches the anterior end of the symphysis on the ventral side of the dentary
  6. Ventrolaterally directed splenial process

Species

Kryptohadros kallaiae Magyar et al., 2026

Type species

Named for Csilla Kállai, the mother of lead author János Magyar.

Holotype
LPB (FGGUB) R.2882 , Laboratory of Paleontology, Faculty of Geology and Geophysics, University of Bucharest
Material
Partial skull, dorsal rib fragments, caudal vertebrae, a neural spine fragment, chevrons, and a partial hindlimb.
Horizon
middle Densuș-Ciula Formation, Maastrichtian, Late Cretaceous , 72.2–66.0 million years ago
Locality
Fântânele-3, Hunedoara, Romania Magyar and colleagues (2026) place the type locality in "the lower part of the Middle Member of the Densuș-Ciula Formation".

References

  1. 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): 2607800. Informa UK Limited. doi:10.1080/14772019.2025.2607800

    Erects Kryptohadros kallaiae and names the clade Telmatosauridae.

    magyar2026a