Waipio Valley Stream Restoration Study

Insects: Native Species

Scientific name: Saldula exulans
Common name(s): Hawaiian Saldid Bug

Saldula exulans

Status: Endemic

Habitat: Exclusively found on stream rocks and edges of streams

Preferred Area of Stream: Can be found in any rocky area of a fast-flowing stream, often will jump on top of the water surface to get around the stream.

Range in Hawai‘i: Common on all Hawaiian Islands

Diet: Preys on small insects living near the surface of the stream. The mouthparts of the Hawaiian Saldid bug include an elongated beak that is used for piercing and sucking. The beak encloses two channels (each a hollow tube): one carries saliva to the host tissue, and one sucks up the liquid food

Predators: Birds, fish, predatory insects such as dragonflies

Fact: This small bug is one of the most prominent native insects along a swift and fast-flowing rocky stream. They are also flightless, and it is not known how they disperse to other streams, or how they reached Hawai‘i since they are exclusively aquatic.