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The subphylum Hexapoda (from Greek for 'six legs') or hexapods comprises the largest clade of arthropods and includes most of the extant arthropod species. It includes the crown group class Insecta (true insects), as well as the much smaller clade Entognatha, which includes three classes of wingless arthropods that were once considered insects: Collembola (springtails), Protura (coneheads) and ...
The Entognatha are a class of wingless and ametabolous arthropods, which, together with the insects, makes up the subphylum Hexapoda. [1] [2] Their mouthparts are entognathous, meaning that they are retracted within the head, unlike the insects. [1] Entognatha are apterous, meaning that they lack wings.
Hexapodidae is a family of crabs, the only family in the superfamily Hexapodoidea. [1] It has traditionally been treated as a subfamily of the family Goneplacidae, [2] and was originally described as a subfamily of Pinnotheridae.
Carnivores have chelicerae that tear and crush prey, whereas herbivores can have chelicerae that are modified for piercing and sucking (as do parasitic species). In sea spiders, the chelicerae (also known as chelifores) are short and chelate and are positioned on either side of the base of the proboscis or sometimes vestigial or absent.
Springtails (class Collembola) form the largest of the three lineages of modern hexapods that are no longer considered insects.Although the three orders are sometimes grouped together in a class called Entognatha because they have internal mouthparts, they do not appear to be any more closely related to one another than they are to all insects, which have external mouthparts.
Their similarity is an example of convergent evolution; mantidflies do not have tegmina (leathery forewings) like mantises, their antennae are shorter and less thread-like, and the raptorial tibia is more muscular than that of a similar-sized mantis and bends back farther in preparation for shooting out to grasp prey.
The development of insect mouthparts from the primitive chewing mouthparts of a grasshopper in the centre (A), to the lapping type (B) of a bee, the siphoning type (C) of a butterfly and the sucking type (D) of a female mosquito.
Hexapoda: Order: Diplura ... Diplurans do not possess any eyes or wings. [4] In males, glandular setae or disculi may be visible along the first abdominal sternite ...