| Achillesaurus Temporal range: Santonian
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| Illustration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Genus: | †Achillesaurus |
| Species: | †A. manazzonei
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| Binomial name | |
| †Achillesaurus manazzonei Martinelli & Vera 2007
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Achillesaurus is a genus of alvarezsaurid theropod dinosaur from the Santonian-age Upper Cretaceous Bajo de la Carpa Formation of Rio Negro, Argentina. It was named in reference to Achilles' heel, because diagnostic features are found there for these animals. The genus was a relatively large, basal alvarezsaurid, and a contemporary of Alvarezsaurus. Achillesaurus is based on MACN-PV-RN 1116, a partial skeleton including a sacral vertebra, four tail vertebrae, part of the left thighbone, shin and foot, and the left ilium. Agustín Martinelli and Ezequiel Vera, who described the specimen, performed a phylogenetic analysis and found their new genus to be an alvarezsaurid with an unresolved relationship to Alvarezsaurus and more derived alvarezsaurids.[1] Makovicky, Apesteguía & Gianechini (2012) argued that Achillesaurus might actually be a junior synonym of Alvarezsaurus which, according to the authors, "is known from the same formation and from which it [i.e. Achillesaurus] differs trivially."[2]
References
[edit]- ^ Martinelli, A.G.; Vera, E.I. (2007). "Achillesaurus manazzonei, a new alvarezsaurid theropod (Dinosauria) from the Late Cretaceous Bajo de la Carpa Formation, Río Negro Province, Argentina". Zootaxa. 1582: 1–17. doi:10.11646/zootaxa.1582.1.1.
- ^ Makovicky, P.J.; Apesteguía, S.N.; Gianechini, F.A. (2012). "A New Coelurosaurian Theropod from the La Buitrera Fossil Locality of Río Negro, Argentina". Fieldiana Life and Earth Sciences. 5: 90–98. doi:10.3158/2158-5520-5.1.90. S2CID 129758444.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
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