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- (Indonesia) KBBI Daring, pangkalan data KBBI yang disusun berdasarkan KBBI edisi III.
- (Inggris) Encyclopaedia Britannica Encyclopaedia Britannica.
- (Inggris) Integrated Taxonomic Information, sistem informasi taksonomi terintegrasi.
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Ciri-ciri
Xixiasaurus adalah troodontid, kelompok yang kecil, menyerupai burung, gracile maniraptorans. Semua troodontida memiliki banyak hal unik pada tengkoraknya, seperti gigi yang lebih rapat di rahang bawah, dan jumlah gigi sangat banyak. Troodontida memiliki cakar melengkung dan tangan yang liar, dan beberapa of the highest non-avian encephalization quotients, meaning they were behaviourally advanced and had keen senses.[1] Xixiasaurus is about 12 m (39 ft) long.[2] It is one of few troodontids that have no serrations on its teeth, similar to its closest relative Byronosaurus. Xixiasaurus has fewer teeth than Byronosaurus and Mei, but more than Sinornithoides, Zanabazar and Saurornithoides. Like Bryonosaurus, the palate is extensive, and the teeth are heterodont.[1]
Xixiasaurus is known from a mostly complete skull, only lacking the posterior portion. The top of the snout is slightly displaced, but overall, the skull resembles Bryonosaurus. As the nasal bones are very not and not completely fused, the holotype of Xixiasaurus may have died immature. Most of the braincase is preserved, as well as most teeth and all tooth sockets. Viewed from below, the tooth rows form a U-shaped curve. Some small pits are present of the lateral surface of the maxilla. The teeth on the maxilla are larger than those in the premaxilla. The hand and lower arm are also preserved. The claw of the first digit is very large, with a large flexor tubercle. The first phalanges of the first two digits are 36 cm (14 in) and 3 cm (1,2 in) long, respectively.[1]
Discovery
Xixiasaurus henanensis was first described in 2010 as a new binomial, which was from the Late Cretaceous of China. The holotype specimen is HGM 41HIII−0201, which includes most of a skull and a partial lower arm. Xixiasaurus was chosen as the genus name in reference to the Xixia Basin, where the fossils were found, and saurus, meaning "lizard". The species name was chosen for the Henan Province, where the basin is located.[1] Thus, the name translates to "Henan Xixia lizard".[2] Xixiasaurus is from the middle region of the Majiacun Formation, which dates to the Coniacian-Campanian, about 83 million years ago.[1]
Referensi
- ^ a b c d e Junchang Lü, Li Xu, Yongqing Liu, Xingliao Zhang, Songhai Jia, and Qiang Ji (2010). "A new troodontid (Theropoda: Troodontidae) from the Late Cretaceous of central China, and the radiation of Asian troodontids" (PDF). Acta Palaeontologica Polonica. 55 (3): 381–388. doi:10.4202/app.2009.0047.
- ^ a b Martyniuk, M.P. (2012). A Field Guide to Mesozoic Birds and Other Winger Dinosaurs. Pan Aves. hlm. 102. ISBN 978-0-9885965-0-4.
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