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Skeleton of bearded dragon (pogona sp.) on display at the Museum of Osteology. Some lizards, particularly iguanas, have retained a photosensory organ on the top of their heads called the parietal eye, a basal ("primitive") feature also present in the tuatara. This "eye" has only a rudimentary retina and lens and cannot form images, but is ...
Squamata (/ s k w æ ˈ m eɪ t ə /, Latin squamatus, 'scaly, having scales') is the largest order of reptiles, comprising lizards (including snakes).With over 12,162 species, [3] it is also the second-largest order of extant (living) vertebrates, after the perciform fish.
The Brachiosauridae ("arm lizards", from Greek brachion (βραχίων) = "arm" and sauros = "lizard") are a family or clade of herbivorous, quadrupedal sauropod dinosaurs. [1] Brachiosaurids had long necks that enabled them to access the leaves of tall trees that other sauropods would have been unable to reach. [2]
Varanus komodoensis is the largest species of living lizards Skeleton of Varanus priscus at Melbourne Museum True monitors gave rise to the largest known terrestrial squamates ever to exist. Most species are medium-sized among monitors, with adults measuring 1 to 2 m (3 ft 3 in to 6 ft 7 in) in length and rarely exceeding weights of 10 kg (22 ...
The scales may be ossified or tubercular, as in the case of lizards, or modified elaborately, as in the case of snakes. [1] The scales on the top of lizard and snake heads has also been called pileus, after the Latin word for cap, referring to the fact that these scales sit on the skull like a cap. [2]
Diagram showing homologous bones of the skulls of a monitor lizard and a crocodile. Jugal bone labelled Ju, in pale green, at centre left. The jugal is a skull bone found in most reptiles, amphibians and birds. In mammals, the jugal is often called the malar or zygomatic.
Monitor lizards have a high aerobic scope [23] [25] that is afforded, in part, by their heart anatomy. Whereas most reptiles are considered to have three-chambered hearts, the hearts of monitor lizards – as with those of boas and pythons – have a well developed ventricular septum that completely separates the pulmonary and systemic sides of ...
Anatomy of the frill of Chlamydosaurus kingii. The frilled lizard grows to a total length of around 90 centimetres (35 in) and a head-body length of 27 cm (11 in), and weighs up to 600 g (1.3 lb). [10] [12] [13] It has a particularly large and wide head; a long neck to accommodate the frill; long legs and a tail that makes most of its total length.