This looks like a major paper, representing quite a body of work, and of biogeographic interest as well.
Buckley, T. R.; James, S.; Allwood, J.; Bartlam, S.; Howitt, R. ; Prada, D. 2011: Phylogenetic analysis of New Zealand earthworms (Oligochaeta: Megascolecidae) reveals ancient clades and cryptic taxonomic diversity. Molecular Phylogenetics and Evolution 58(1): 85-96.
Journal link http://www.sciencedirect.com/science/journal/10557903
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