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Above: An adult acorn barnacle and its schematic morphology showing well differentiated body regions [16] ; Below: A 3D representation of rhizocephalan barnacle without any arthropod like segmentation, ex-externa (in orange), green root like tissue represents the interna, a-right side view, b-left side view; adapted from Noever et al. [17]

Above: An adult acorn barnacle and its schematic morphology showing well differentiated body regions [16] ; Below: A 3D representation of rhizocephalan barnacle without any arthropod like segmentation, ex-externa (in orange), green root like tissue represents the interna, a-right side view, b-left side view; adapted from Noever et al. [17]

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Since the 'theory of natural selection' proposed by Darwin, the study of kind and diversity of life got a whole new perspective under the light of evolution, but there is a lack of shreds for evidences regarding the origin of complicated developmental strategies among organisms. Insects are not an exception as they include a sheer number of taxa wi...