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Há 4 dias · Within a few million years, two important amniote lineages became distinct: synapsids, from which mammals are descended, and sauropsids, from which lizards, snakes, turtles/tortoises, crocodilians, dinosaurs, and birds are descended.
Há 2 dias · A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia ( / məˈmeɪli.ə / ). Mammals are characterized by the presence of milk -producing mammary glands for feeding their young, a neocortex region of the brain, fur or hair, and three middle ear bones.
Há 2 dias · 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). Another huge caseasaur is Cotylorhynchus hancocki , with an estimated length and weight of at least 6 m (20 ft) [69] and more than 500 kg (1,100 lb).
Há 5 dias · amniote: 1 n any member of the Amniota Type of: craniate , vertebrate animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium
Há 2 dias · The very first reptile was an amniote, which is any group of animals that undergo embryonic or fetal development within an amnion, and appeared 350 million years ago, during the late Paleozoic era. These amniotes later split into two groups – the synapsids and the sauropsids, which are reptiles.
Há 5 dias · amniotic: 1 adj of or related to the amnion or characterized by developing an amnion “ amniotic membrane” Synonyms: amnic , amnionic
Há 2 dias · Hagfish are a sexually dimorphic species with a ratio of up to 100:1 in favor of females. Some species are hermaphroditic. Females lay anywhere between 1-30 tough eggs that stick to each other with Velcro-like ends. The gestation period is typically 11 months, and there is no larval stage, unlike lampreys.
