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Relationship Between Class and Order Within Two Taxonomic Groups

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The subphylum Hexapoda, known for a common body structure consisting of the famous three pairs of legs, abdomen, thorax and head, is divided into two taxonomic groups: the Entognatha and the Ectognatha (Sasaki et al., 2013). Within the Entognatha are the orders Diplura, Collembola, and Protura (Sasaki et al., 2013). These are all wingless orders (Sasaki et al., 2013). The Entognatha are marked by an entognathy, which is seen as their mouthparts being further inside their head, being enclosed by extensions of the head (Reiger et al., 2004). Within the Ectognatha is the class Insecta (Sasaki et al., 2013). This is further subdivided into the orders Pterygota, Zygentoma, and Archaeognatha (Sasaki et al., 2013). Ectognatha are classified by an…show more content…
This study analyzed sequence data of nucleic acids and found that the Hexapoda tree was in fact monophyletic (Reiger et al., 2004). Recent mitochondrial genomic sequencing data has shown that wingless collembolans and diplurians may not be as related to hexapods as originally thought (Sasaki et al., 2013).Based on the same mitochondrial genomic data, it has been inferred that collembolans and diplurians are more related to crustaceans (Sasaki et al., 2013). However, when nuclear molecular data such as rDNA and protein coding genes were analyzed for phylogenetic analysis, it was determined that Hexapoda is indeed monophyletic (Sasaki et al., 2013). By looking at all of these studies, it can clearly be seen that different phylogenies can be recovered by analyzing different characteristics of a group of organisms (Reiger et al., 2004; Sasaki et al., 2013).
Traditionally, the group Entognatha within the subphylum Hexapoda consists of the orders Diplura, Collembola, and Protura, which are classified into this group by their mouth structure, namely, the presence of entognathy (Luan et al., 2005). Further research on the mouthparts has identified two different kinds of entognathy, one of which is found in both Protura and Collembola while the second form is unique to the Diplura (Sekiya and Machida, 2011). According to molecular studies, the order Protura has been
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