Information for this page is currently being updated….to include a revision of the brief discussion on Classification presented on the Current Perspectives page of this website.  We encourage you to visit that page, and to also read the following recently published papers and literature cited therein:

Magalhães, W.F.,  P. Hutchings, A. Oceguera-Figueroa, P. Martin, R.M. Schmelz, M.J. Wetzel, H. Wiklund,  N.J. Maciolek, G.Y. Kawauchi, and J.D. Williams. 2021. Segmented worms (Phylum Annelida): a celebration of twenty years of progress through Zootaxa and call for action on the taxonomic work that remains. Zootaxa 4979(1): 190–211. 

Schmelz, R.M., C. Erséus, P. Martin, T. van Haaren, and T. Timm. 2021. A proposed order-level classification in Oligochaeta (Annelida, Clitellata). Zootaxa 5040(4): 589–597.  https://doi.org/10.11646/zootaxa.5040.4.9

Timm, T., and P.J. Martin. 2015.  Clitellata: Oligochaeta.  Chapter 21. Pp. 529–549, In: J. Thorp and D.C. Rogers (eds). Ecology and General Biology. Volume 1. Thorp and Covich’s Freshwater Invertebrates. Elsevier, Academic Press. ISBN: 9780123850263. ^

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[page update: 29dec2021 2022-I-14; ;mjw]