Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

Guide to New Zealand's freshwater invertebrates

Water boatman ( Corixidae : Diaprepocoris )

Diagnostic features

Diaprepocoris bugs are similar in appearance to the common water boatman Sigara, having long hair-fringed hind legs designed for swimming, and having forelegs ending in a trowel-like segment. Unlike Sigara however, Diaprepocoris have two small dark spots (ocelli) between the large compound eyes.

Typical habitats

Diaprepocoris can be common in ponds and lakes, including coastal lakes with tidal influence.


It is likely that Diaprepocoris has a similar diet to the related Sigara, which feeds on algae and organic detritus.

Indicator value

An abundance of Diaprepocoris is likely to be the result of pond-like habitat conditions (at the site or upstream) rather than any particular water quality condition. They have medium tolerance values of 5 (hard bottom sites) and 4.7 (soft bottom sites).