Eousdryosaurus

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Eousdryosaurus
Temporal range:
Ma
↓
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: †Ornithischia
Clade: †Ornithopoda
Family: †Dryosauridae
Genus: †Eousdryosaurus
Escaso et al., 2014
Species:
†E. nanohallucis
Binomial name
†Eousdryosaurus nanohallucis
Escaso et al., 2014

Eousdryosaurus ("eastern

Upper Jurassic rocks in western Portugal
. The type, and only species, is Eousdryosaurus nanohallucis, named and described in 2014.

Discovery and naming

Eousdryosaurus is

chevrons, the left ilium, the entire left leg, and the right thigh bone (femur). These bones were discovered in sandstone of the late Kimmeridgian-age (late Jurassic, approximately 152 million years old) Praia da Amoreira-Porto Novo Member of the Lourinhã Formation in Porto das Barcas, Lourinhã, Portugal. The genus name is a reference to Eousdryosaurus being a relative of Dryosaurus on the east side of the Atlantic Ocean. The type and only species is E. nanohallucis, meaning "small hallux", in reference to the small size of that toe.[1] Eousdryosaurus was named in 2014 by Fernando Escaso and colleagues,[1] after having been described briefly in 2000.[2]

Description

The only known individual of Eousdryosaurus was a small dryosaurid, estimated at 1.6 metres (5.2 ft) in length, comparable to immature individuals of Dryosaurus and Dysalotosaurus. The right femur measures 188.5 millimetres (7.42 in) long and the left shin bone (tibia) measures 200 millimetres (7.9 in) long.[1]

It is differentiated from other dryosaurids by various details of the vertebrae, hip, and hind limb. The foot is unique among

hadrosaurs ("duckbills"), lost this digit.[1]

Classification

Escaso et al. performed a

Dryomorpha, a type of small bipedal herbivore near the base of Iguanodontia.[1]

On the other hand, Dieudonné et al. (2020) found Eousdryosaurus to be a sister taxon to the Elasmaria.[3]

In their 2024 description of the contemporary Hesperonyx, Rotatori et al. found support for a dryosaurid position of Eousdryosaurus in both their parsimony and Bayesian analyses, contrasting with the suggestions of Dieudonné et al. (2020). Their results are displayed in the cladogram below:[4]

Iguanodontia

References

  1. ^
    S2CID 86780835
    .
  2. ^ Dantas, P. P.; C. J. Yagüe, F. Hazevoet; V. Ortega, J. L. dos Santos; M. Sanz, A. M. Cachão & de Carvalho Galopim, J. J. Santos (2000). "Estudo preliminar de um novo Iguanodontia basal do Jurássico Superior Portugûes". In J. B. Diez & A. C. Balbino (eds.). Livro de Resumos do I Congresso Ibérico de Paleontologia/XVI Jornadas de la Sociedad Española de Paleontología, Évora (Portugal), 12–14 Outubro 2000. Évora, Portugal: Universidade de Évora. pp. 12–13.
  3. ISSN 0891-2963
    .
  4. doi:10.1080/02724634.2024.2310066
    .
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