The Life of Animals | Fly | The genitalia of female flies are rotated to a varying degree from the position found in other Insects. When flies mate, the male initially flies on top of the female, facing in the same direction, but then turns round to face in the Opposite direction. This forces the male to lie on his back for his genitalia to Remain engaged with Those of the female, or the torsion of the male genitals allows the male to mate while remaining upright. Flies occur in great Populations due to Their ability to mate effectively and in a short period of time During the season.
The female lays her eggs as close to the food source as possible, and development is rapid, allowing the larvae to consume as much food as possible in a short period of time before transforming into adults. The eggs hatch IMMEDIATELY after being laid, or the flies are ovoviviparous, with the Hatching larvae inside the mother. Larval true flies have no legs.
Informally, Such Brachyceran Called Maggots are larvae, but the term is nontechnical and Often applied indifferently to fly larvae or insect larvae in general. The eyes and antennae of Brachyceran larvae are reduced or absent, and the abdomen also lacks appendages Such as cerci. This lack of features is an adaptation to food Such as carrion, decaying detritus, or endoparasites Surrounding host tissues. Generally Nematoceran larvae have eyes and antennae visible, though usually small and of limited function. Diptera Derive from Mecoptera or a strictly related group.
The Bibionomorpha are a sister clade to Brachycera. The branching order of the remaining clades of the lower Diptera - infraorders Culicomorpha, Psychodomorpha and Tipulomorpha - has yet to be resolved. Within the Brachycera, progressively nested Several groups exist: Eremoneura (three larval instars), Cyclorrhapha (pupation Occurs within a puparium), Schizophora (That flies Their escape from the puparium using ptilinal sac, an evertable frontal pouch) and Calyptratae (larger flies with That wings have the calypter, an enlarged basal lobe). The Schizophora include most of the family-level diversity in Diptera (~ 85 families) and more than 50.000 species. The Calyptratae form a monophyletic superfamily.
