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Guide to New Zealand's freshwater invertebrates
Richardsonianus mauianus is one of the few blood-sucking leeches in New Zealand. Like other leeches they are visibly segmented, very flexible and there is a suction disc at the tail end. Richardsonianus is larger than the more common glossiphoniids, and it is easily recognised by its yellow and black longitudinal stripes. The curved row of 10 eyes in Richardsonianus is also quite different to the eye arrangements of the more common leeches.
Richardsonianus is occasionally found in lakes and slow flowing weedy streams. They are common in the Oruarangi Creek in Mangere.
They are blood suckers, and will latch on to the bare legs of humans wading in their habitats
Richardsonianus is too rarely recorded to be a useful water quality indicator. This genus has not been assigned tolerance values but the Subclass Hirudinea (leeches) have low tolerance values of 3 (hard bottom sites) and 1.2 (soft bottom sites).