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Pancrustacea
Pancrustacea is a clade, comprising all crustaceans and hexapods. This grouping is contrary to the Atelocerata hypothesis, in which Myriapoda and Hexapoda are sister taxa, and Crustacea are only more distantly related. As of 2010, the Pancrustacea taxon is considered well accepted. The clade has also been called Tetraconata, referring to the square ommatidia of many of its members. That name is preferred by some scientists as a means of avoiding confusion with the use of "pan-" to indicate a clade that includes a crown group and all of its stem group representatives.
==Molecular studies==
A monophyletic Pancrustacea has been supported by several molecular studies, in most of which the subphylum Crustacea is paraphyletic with regard to insects (that is, that insects are derived from crustacean ancestors).
The evidence for this clade derives from molecular data and morphological characteristics. The molecular data consists of comparisons of nuclear ribosomal RNA genes, mitochondrial ribosomal RNA genes, and protein coding genes. The morphological data consists of ommatidial structures (see ''arthropod eye''), the presence of neuroblasts, and the form and style of axonogenesis by pioneer neurons.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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