Structural rRNA Characters Support Monophyly of Raptorial Limbs and Paraphyly of Limb Specialization in Water Fleas
Proceedings of the Royal Society B: Biological Sciences
Arthropod limb evolution, Molecular morphometrics, rRNA secondary structure, Phylogeny
The evolutionary success of arthropods has been attributed partly to the diversity of their limb morphologies. Large morphological diversity and increased specialization are observed in water flea (Cladocera) limbs, but it is unclear whether the increased limb specialization in different cladoceran orders is the result of shared ancestry or parallel evolution. We inferred a robust among–order cladoceran phylogeny using small–subunit and large–subunit rRNA nuclear gene sequences, signature sequence regions, novel stem–loops and secondary structure morphometrics to assess the phylogenetic distribution of limb specialization. The sequence–based and structural rRNA morphometric phylogenies were congruent and suggested monophyly of orders with raptorial limbs, but paraphyly of orders with reduced numbers of specialized limbs. These results highlight the utility of complex molecular structural characters in resolving ancient rapid radiations.
Timothy D. Swain and Derek J. Taylor. 2003. Structural rRNA Characters Support Monophyly of Raptorial Limbs and Paraphyly of Limb Specialization in Water Fleas .Proceedings of the Royal Society B: Biological Sciences , (1518) : 887 -896. https://nsuworks.nova.edu/occ_facarticles/995.