ORDER DoubtfulCrassiclitellataAnimaliaAnnelidaClitellataPublished in Jamieson, Barrie G. M. (1988). On the phylogeny and higher classification of the Oligochaeta. Cladistics, 4: 367–410. https://doi.org/10.1111/j.1096-0031.1988.tb00520.xAboutMetrics