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These minute arthropods are apterous, unlike some orders of insects that have lost their wings secondarily (but are derived from winged ancestors). Their mouthparts are enclosed within a pouch in the head capsule, called the gnathal pouch, so only the tips of the mandibles and maxillae are exposed beyond the cavity. [1]
Four-legged animals such as dogs sometimes lose limbs and become artificially tripedal. There are some three-legged creatures in the world today, namely four-legged animals (such as pet dogs and cats) which have had one limb amputated. With proper medical treatment most of these injured animals can go on to live fairly normal lives, despite ...
Trident of Poseidon. A trident (/ ˈ t r aɪ d ə n t /) is a three-pronged spear.It is used for spear fishing and historically as a polearm.As compared to an ordinary spear, the three tines increase the chance that a fish will be struck and decrease the chance that a fish will be able to dislodge itself if struck badly.
They have one or two pairs of eversible membranous vesicles on the underside of abdominal segments 1 to 7, which are used to absorb water and assisting with molting. [15] There are nine pairs of spiracles; two pairs on the thorax, and seven pairs on abdominal segments 2 to 8. [16] The pair of spiracles on the first abdominal segment has been ...
The abdomens of diplurans bear eversible vesicles, which seem to absorb moisture from the environment and help with the animal's water balance. [6] The body segments themselves may display several types of setae, or scales and setae. [7] Diplurans possess a characteristic pair of cerci projecting backwards from the last of the 11 abdominal ...
The docodont Castorocauda, further removed from crown group mammals than Hadrocodium, had two layers of fur, guard hairs and underfur, as do mammals today. [11] It is possible that early mammaliaforms had vibrissae; Tritheledontidae, a group of cynodonts, probably had whiskers. [12] A common ancestor of all therian mammals did so. [13]
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Heterophylly is the presence of two or more different forms of leaves within an individual. Heteroblasty is the occurrence of distinct leaf types at different stages of the life cycle. Other forms are seasonal heterophylly, distinctions between basal and cauline foliage, and between the foliage of old wood and new wood.