The remaining groups are harder to define, with the exception of the (3) Capitelliformia, which are mud-living worms of an "oligochaetous" appearance, and with some affinities to that order.
It is, however, though doubtless near to the base of the Oligochaetous series, most nearly allied in the reproductive system to the Oligochaeta.
Paired setae of Oligochaetous pattern present in anterior segments.
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