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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 ...
Toggle Subphylum Hexapoda subsection. 1.1 Class Insecta (Insects) 1.1.1 Subclass Monocondylia or Monochlamydia. 1.1.2 Subclass Dicondylia. 1.2 Class Collembola.
The relationship of Hexapoda and the crustacean classes is shown in the following phylogenetic tree, which shows Allotriocarida, along with Oligostraca and Multicrustacea, as the three main divisions of subphylum Pancrustacea, embracing the traditional crustaceans and the hexapods (including insects). [1]
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.
Traditional morphology-based systematics have usually given the Hexapoda the rank of superclass, [27] and identified four groups within it: insects (Ectognatha), Collembola, Protura, and Diplura, the latter three being grouped together as the Entognatha on the basis of internalized mouth parts.
Recent studies strongly suggest that Crustacea, as traditionally defined, is paraphyletic, with Hexapoda having evolved from within it, [133] [134] so that Crustacea and Hexapoda form a clade, Pancrustacea. The position of Myriapoda, Chelicerata and Pancrustacea remains unclear as of April 2012.
Subphylum: Hexapoda: Class: Collembola Lubbock, 1871: ... They display some unexplained characteristics: first, all but one of the fossils from the Cretaceous belong ...
Atelocerata is described as replacing Uniramia in early twentieth-century texts (Heymons, 1901), where it was the preferred name for the category uniting the Hexapoda (insects) + Myriapoda; but depending on the source, the term Atelocerata may have replaced Mandibulata, [3] be an infraphylum beneath Mandibulata, [4] or may no longer be a valid ...