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The larvae are legless grubs, tapering at both ends. They have small heads and 11 or 13 segments and moult six to 13 times over the course of a year or more. In temperate species, the larvae have a quiescent period during winter (diapause), while tropical species breed several times a year.
The larvae develop in the tissue of the tongue, [3] in tunnels within 1.5 mm (0.059 in) of the surface. [8] Second instar larvae are swallowed and pass into the host's stomach, [3] and attach to the non-glandular region of the stomach. [9] The larvae remain in the stomach for 8–10 months, [5] before maturing into third instar larvae. [3]
Gasterophilus, commonly known as botfly, is a genus of parasitic fly from the family Oestridae that affects different types of animals, especially horses, but it can also act on cows, sheep, and goats. A case has also been recorded in a human baby.
The larvae remain attached and develop for 10–12 months before they are passed out in the feces. Occasionally, horse owners report seeing botfly larvae in horse manure. These larvae are cylindrical and are reddish-orange. In one to two months, adult botflies emerge from the developing larvae and the cycle repeats itself. [8]
The larvae have rings of cuticular hooks and terminal stylets that are believed to be used to enter the hosts. Once inside the host, the larvae live inside the haemocoel and absorb nutrients directly through their skin. Development into the adult form takes weeks or months, and the larva moults several times as it grows in size. [8]
Larvae of Hypoderma species also have been reported in horses, sheep, goats and humans. [1] They have also been found on smaller mammals such as dogs, cats, squirrels, voles and rabbits. Adult warble flies are large, hairy and bumblebee-like and brown, orange or yellow in color. The adults have vestigial mouthparts, so they cannot feed during ...
Baby horseshoe crabs begin their lives as a "trilobite larva", a name given due to their resemblance to a trilobite. [25]: 559 Upon hatching, larva typically measure around 1 cm (1 ⁄ 2 in) long. Their telson is small, and they lack three pairs of book gills. [25]: 559 In all other respects, the larvae appear like minuscule adults.
A few species feed on larger vertebrate carcasses. Flesh fly maggots occasionally eat other larvae, although this is usually because the other larvae are smaller and get in the way. Flesh flies and their larvae are also known to eat decaying vegetable matter and excrement, and they may be found around compost piles and pit latrines. [3]