Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti). West Papua, Indonesia. Indo-West Pacific.

Ashley Cooper / Road sweepers wear face masks against the air pollution in Suihua city in Northern China.March 2009

David Fleetham / Gorgonian, alconarian coral and schooling Pygmy sweepers (Parapriacanthus ransonneti) Indonesia.

David Fleetham / Many spotted sweetlips (Plectorhinchus chaetodonoides) with yellow Pygmy sweepers (Parapriacanthus ransonneti) Komodo, Indonesia.

David Fleetham / Diver (MR) with yellow pygmy sweepers (Parapriacanthus ransonneti). Komodo, Indonesia. September 2008. Model released

Alex Mustard / Schooling sweepers (Pempheris schwenkii) inside the engine room of the Giannis D wreck. Abu Nuhas reef, Egypt. Strait of Gubal, Gulf of Suez, Red Sea.

Linda Pitkin / School of Golden/ Pygmy Sweepers (Parapriacanthus ransonneti), and other fishes, sheltering around a coral head Dampier Strait, Raja Ampat, West Papua, Indonesia.

Linda Pitkin / School of Golden/ Pygmy Sweepers (Parapriacanthus ransonneti), and other fishes, sheltering around a coral head Dampier Strait, Raja Ampat, West Papua, Indonesia, March 2016

Bertie Gregory / Cave full of Cave sweepers (Pempheris vanicolensis) in the northern Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) with a Gorgonian sea fan (Melithaea sp.) and soft corals (Dendronephthya sp) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Coral reef with a Coral hind (Cephalophus miniata), Delicate sea whips (Jungceellia fragilis) and a large number of Pygmy sweepers (Parapriacanthus ransonetti) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Coral reef with soft corals (Dendronephthya sp.), encrusting sponges and Pygmy sweepers (Parapriacanthus ransonetti) Similan Islands, Andaman Sea, Thailand.