An overview of glossiphoniid leech development
2001
Dramatic advances in understanding the development of selected "model" organisms, coupled with the realization that genes which regulate development are often conserved between diverse taxa, have renewed interest in comparative development and evolution. Recent molecular phylogenies seem to be converging on a new consensus "tree," according to which higher bilaterians fall into three major groups, Deuterostoma, Ecdysozoa, and Lophotrochozoa. Commonly studied model systems for development fall almost exclusively within the first two of these groups. Glossiphoniid leeches (phylum Annelida) offer certain advantages for descriptive and experimental embryology per se, and can also serve to represent the lophotrochozoan clade. We present an overview of the development of glossiphoniid leeches, highlighting some current research questions and the potential for comparative cellular and molecular studies.
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