Manidens

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Manidens
Temporal range: Middle Jurassic, 171–167 Ma
Manidens skull.jpg
Skull reconstruction
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Family: Heterodontosauridae
Subfamily: Heterodontosaurinae
Genus: Manidens
Pol et al., 2011
Type species
Manidens condorensis
Pol et al., 2011

Manidens is a genus of heterodontosaurid dinosaur from the Middle Jurassic of Patagonia. Fossils have been found from the Cañadon Asfalto Formation in Chubut Province, Argentina, dating to the Bajocian.[1]

Etymology

The type species of Manidens, Manidens condorensis, was described in the journal Naturwissenschaften in 2011. Manidens was named in by Diego Pol, Oliver Rauhut and Marcos Becerra. The generic name is derived from Latin manus, "hand", and dens, "tooth", a reference to the hand-shaped form of the posterior lower teeth. The specific name refers to the village of Cerro Cóndor, located near to the Queso Rallado site where the specimen was found by zoologist Guillermo Rougier.[1]

Description

The holotype specimen of Manidens, MPEF-PV 3211, consists of a partial skeleton with skull and lower jaws, including the axial column except most of the tail; a left shoulder girdle; and the pelvis. The specimens MPEF-PV 1719, 1786, 1718, 3810, 3811, isolated posterior teeth, from the same locality and horizon as the holotype are also referred to this genus. The specimens were found in the Queso Rallado locality of the Cañadón Asfalto Formation, dating to the Aalenian–Early Bathonian stages, 171 ± 5 to 167 ± 4 Ma.[1]

Manidens was a relatively basal heterodontosaurid that grew to about 60 to 75 centimetres (24 to 30 in) in length, smaller than later heterodontosaurids. It has high-crowned teeth indicative of an increased adaptation to a herbivorous diet but lacks the wear facets seen in more advanced forms like Heterodontosaurus. Manidens is the sister taxon of a clade consisting of the African species Heterodontosaurus, Abrictosaurus and Lycorhinus, indicating an early radiation of the heterodontosaurids.[1] Is very possible, based on phylogenetic bracketing, that this animal sported long, filamentous structures along the body like Tianyulong although they weren't preserved on Manidens.

Life restoration

Phylogeny

Cladogram after Pol et al., 2011:[1]

Ornithischia

Pisanosaurus

Echinodon*

Heterodontosauridae

Tianyulong

Fruitadens

Manidens

Abrictosaurus

BMNH A100

Heterodontosaurus

Lycorhinus

Eocursor

Genasauria

*Note: Pol et al. regard Echinodon as a genus of Heterodontosauridae.

Paleoecology

Fossils attributed to Manidens from Argentina indicate that this dinosaur may have been at least partially arboreal. The specimens consists of a series of bones from both hind feet and a few tail vertebrae, and are tentatively attributed to Manidens on the basis of provenance. The long toe bones indicate that the toe bones were capable of grasping; distinct anchor attachments for the muscles and tendons of the hallux indicate that its hallux was smaller than the rest of the toes but could still have grasped. Principal component analysis found that the feet of Manidens were most similar to those of tree-perching birds.[2]

References

  1. ^ a b c d e Pol, D.; Rauhut, O.W.M.; Becerra, M. (2011). "A Middle Jurassic heterodontosaurid dinosaur from Patagonia and the evolution of heterodontosaurids". Naturwissenschaften. 98 (5): 369–379. doi:10.1007/s00114-011-0780-5. PMID 21452054.
  2. ^ Becerra, M.C.; Pol, D.; Rauhut, O.W.M.; Cerda, I.A. (2016). "New heterodontosaurid remains from the Cañadón Asfalto Formation: cursoriality and the functional importance of the pes in small heterodontosaurids". Journal of Paleontology. 90 (3): 555–577. doi:10.1017/jpa.2016.24.


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