In Ireland the number of species is: Taxonomy Here the leeches and oligochaetes are placed together in the Class Clitellata.
8 species including Active predators with leaf-like dorsal cirri, notopodia otherwise reduced.
1 species Slender pelagic forms with giant eyes.
5 species Transparent pelagic group with tapering bodies and foliaceous segmental cirri.
2 species Flattened pelagic forms with long cirri on segment-two.
Tomopteris 2 species Cylindrical forms with a conical prostomium and four jaws.
1 species Similar to Glyceridae with the anterior parapodia uniramous, multiple jaw- pieces, and chevron structures on the proboscis.
5 species Similar to Lumbrineridae with long maxillary carriers.
3 species A Eunicida group with multiple jaw elements.
Most with long, cylindrical segments with a pair of nuchal slits and a median cephalic keel.
2 species Minute forms without setae and with a flexible tentacle pair (near-frontal, but separated).
Ampharete, Melinna 5 species including Resemble Terebellidae but have long-handled hooks.