Demise of the Atelocerata?

Article Abstract:

DNA analysis and gene rearrangement in the mitochondrial genome of arthropods shows that the sister group of insects is probably crustaceans rather than myriapods. The results of these studies support the concept of a monophyletic Arthropoda. Nervous system development and eye structure in crustaceans and insects are similar and are different from those of myriapods. The features generally used to link myriapods to insects are seen in many other phyla are probably because of convergent evolution as both groups are terrestrial.

Observations, Phylogeny, Myriapods

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The case of the velvet worm

Article Abstract:

Molecular research show that the velvet worms or Onychophora should be classified as arthropods rather than as the evolutionary link between annelids and arthropods. Anatomical and fossil evidence is insufficient to settle the velvet worm's relationship with the arthropods. J.W.O. Ballard and colleagues compared DNA sequences from velvet worms and arthropods and verified that the two groups are related, with the velvet worms representing a degeneration of arthropod anatomy.

Usage, Invertebrates, Varieties, Molecular genetics, Onychophorans

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Homeotic genes and the evolution of arthropods and chordates

Article Abstract:

Morphological differences among arthropods and chordates have developed despite the conservation of the homeotic (Hox) gene clusters which control the development of body pattern. This indicates that changes in the numbers of Hox genes, the functions of the genes or their regulation may be responsible for evolutionary diversions. Evidence suggests that hox genes regulate limb development through suppression or modification rather than instigating the limb development.

Homeobox genes, Chordata, Chordates

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