The largest known marsupial, and the largest metatherian, is the extinct Diprotodon, about 3 m (9.8 ft) long, standing 2 m (6 ft 7 in) tall and weighing up to 2,786 kg (6,142 lb).Its skull could reached over 10 centimetres (3.9 in) in length and a weight of complete animal was 5.2 kilograms (11 lb). Stagodontid mammal Didelphodon was one of the largest Mesozoic metatherians and all Cretaceous mammals.Australohyaena is another large metatherian, weighing up to 70 kilograms (150 lb). Proborhyaenid Proborhyaena gigantea is estimated to weigh over 50 kg (110 lb) and possibly reached 150 kg (330 lb). The largest non-marsupial metatherian was Thylacosmilus, weigh 80 to 120 kilograms (180 to 260 lb), one estimate suggesting even 150 kg (330 lb).Metatherians (Metatheria) Thylacosmilus compared to a human Its body length could be up to a 1 m (3 ft 3 in). Kollikodon was likely the largest monotreme in the Mesozoic.The largest known ornithorhynchid is Obdurodon tharalkooschild, it was even larger than 70 cm (28 in)-long Monotrematum sudamericanum.It was the size of a sheep, weighing probably up to 30 kg (66 lb). The largest known monotreme (egg-laying mammal) ever was the extinct long-beaked echidna species known as Murrayglossus, known from a couple of bones found in Western Australia.Monotremes (Monotremata) Photo-reconstruction of Murrayglossus hacketti ( Zaglossus hacketti) by paleoartist Roman Uchytel The largest multituberculate Taeniolabis taoensis is the largest non- therian mammal known, at a weight possibly exceeding 100 kg (220 lb). Gobiconodon was also a large mammal, it weighed 5.4 kilograms (12 lb), had a skull of 10 cm (3.9 in) in length, and had 35 cm (14 in) in presacral body length. With such parameters it surpassed in size several small theropod dinosaurs of the Early Cretaceous. The known adult of Repenomamus giganticus reached a total length of around 1 m (3 ft 3 in) and an estimated mass of 12–14 kg (26–31 lb). The largest gobiconodont and the largest well-known Mesozoic mammal was Repenomamus. įurther information: Mammal Non-therian mammals Gobiconodonts (Gobiconodonta) A reconstruction of Repenomamus The largest known docodont was Castorocauda, almost 50 cm (20 in) in length.It is known by a right lower molariform 3.3 mm (0.13 in) in length, which is bigger than molariforms of all other morganucodontans. Paceyodon davidi was the largest of morganucodontans, cynodonts close to mammals.The largest known non-mammalian cynodont is Scalenodontoides, a traversodontid, which had a maximum skull length of approximately 61.7 centimetres (24.3 in) based on a fragmentary specimen.The largest of therocephalians is Scymnosaurus, which reached a size of the modern hyena. Other large gorgonopsians include Dinogorgon with skull of ~40 cm (16 in) long, Leontosaurus with skull of almost 40 cm (16 in) long, and Sycosaurus with skull of ~38 cm (15 in) long. Rubidgea atrox is the largest African gorgonopsian, with skull of nearly 45 cm (18 in) long. Inostrancevia latifrons is the largest known gorgonopsian, with a skull length of more than 60 cm (24 in), a total length approaching 3.5 m (11 ft) and a mass of 300 kg (660 lb). Gorgonopsians (Gorgonopsia) Photo-reconstruction of Inostrancevia Adult specimens could reach 6 m (20 ft) in length and over 600 kg (1,300 lb) in weight. Another enormous dinocephalian was the Late Permian Eotitanosuchus (a possible synonym to Biarmosuchus ). Fully grown Titanophoneus from the same family Anteosauridae likely had a skull of 1 m (3.3 ft) long. Dinocephalians (Dinocephalia) Anteosaurus overviewing the landscapeĪmong the largest carnivorous non-mammalian synapsids was the dinocephalian Anteosaurus, which was 5–6 m (16–20 ft) long, and weighed 500–600 kg (1,100–1,300 lb). The plant-eating dicynodont Lisowicia bojani is the largest-known of all non-mammalian synapsids, at about 4.5 m (15 ft) long, 2.6 m (8 ft 6 in) tall, and 9,000 kg (20,000 lb) in body mass. Therapsids (Therapsida) Anomodonts (Anomodontia) Lisowicia compared to a human The Middle Permian Tappenosaurus was estimated at 5.5 m (18 ft) in length, nearly as large as the largest dinocephalians. The largest members of the genus Dimetrodon were also the world's first fully terrestrial apex predators. The biggest carnivorous synapsid of Early Permian was Dimetrodon, which could reach 4.6 m (15 ft) and 250 kg (550 lb). The largest edaphosaurids were Lupeosaurus at 3 m (9.8 ft) long and Edaphosaurus, which could reach even more than 3 m (9.8 ft) in length. Edaphosaurids (Edaphosauridae) Size comparison of some species of Edaphosaurus Cotylorhynchus hancocki is also large, with an estimated length and weight of at least 6 m (20 ft) and more than 500 kg (1,100 lb). The herbivorous Alierasaurus was the largest caseid and the largest amniote to have lived at the time, with an estimated length around 6–7 m (20–23 ft). Further information: Synapsida Caseasaurs (Caseasauria)
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