Sternorrhyncha Genera
The Sternorrhyncha suborder of the Hemiptera contains the aphids, whitefly, whiteflies, and scale insects, groups which were traditionally included in the now-obsolete order "Homoptera". The name "Sternorrhyncha" refers to the rearward position of the mouthparts relative to the head. Distributed worldwide, all members of this group are herbivore, plant-feeders, many considered Pest (organism), pests feeding on cash crop, major crops and ornamental plants. Many exhibit modified Morphology (biology), morphology and/or Biological life cycle, life cycles, including phenomena such as flightless morphs, parthenogenesis, sexual dimorphism, and eusociality. Phylogeny The phylogeny of the extant Sternorrhyncha, inferred from analysis of small subunit (18S) ribosomal RNA, is shown in the cladogram. The evolutionary position of several fossil taxa are unclear. A suggested phylogeny is: Groups Well-known groups in the Sternorrhyncha include: * aphids – (Aphididae) * woolly and gall ...
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