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Aniksosaurus
''Aniksosaurus'' (meaning "spring lizard", from Modern Greek Άνοιξη, "Spring", referring to the fact it was found on 21 September 1995, the onset of Spring on the Southern Hemisphere) is a genus of dinosaur from what is now present-day Chubut Province, Argentina. It was a theropod, specifically a coelurosaur, which lived in the middle Cretaceous period, between 96-91 million years ago. The type species, ''Aniksosaurus darwini'', was formally described by Rubén Dario Martínez and Fernando Emilio Novas in 2006;〔Martínez, R.D., and Novas, F.E. (2006). "Aniksosaurus darwini gen. et sp. nov., a new coelurosaurian theropod from the early Late Cretaceous of central Patagonia, Argentina." Revista del Museo Argentino de Ciencias Naturales, n.s. 8(2): 243-259.〕 the name was first coined in 1995 and reported in the literature in 1997.〔Martínez, R.D., Novas, F.E., 1997, "A new tetanurae (Dinosauria: Theropoda) from the Bajo Barreal Formation (Upper Cretaceous), Patagonia", ''Ameghiniana'' 34(4): 538〕 The specific epithet honors Charles Darwin who visited Patagonia in 1832/1833 during the Voyage of the Beagle.
==Description==
The type specimen MDT-PV 1/48, discovered in the Bajo Barreal Formation, consists of an articulated right hindlimb, which includes the femur, fibula, tibia and foot. The longest femur discovered for this genus measures 247mm, and the longest tibia, 270mm. On average, the tibia is 13% longer than the femur in ''Aniksosaurus'', an adaptation which has been strongly correlated with the development of cursorial habits in dinosaurs.〔Coombs, W. P., Jr. 1978. Theoretical aspects of cursorial adaptations in dinosaurs. The Quarterly Review of Biology 53:393–418.〕 Martinez and Novas (2006), based on femoral measurements, originally suggested that ''Aniksosaurus darwini'' was approximately long and tall at the hip, and weighed up to .〔 However, recent estimates suggest a total body length between and and a body weight between and .〔 In a 2013 study by Ibiricu et al., it was concluded that the holotype and four more individuals referable to ''Aniksosaurus'', were juvenile to sub-adult individuals as shown by a histological analysis. The two individuals analyzed had histological characteristics that suggested an approximate age of three. The morphological evidence supporting ontogenetic immaturity was as follows: (a) the absence of an outer circumferential layer; (b) the absence of secondary (Haversian) osteons; (c) the presence of only a few growth cycles; and (d) the thickness of the zones.
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