Georgette Douwma / Coral reef scenery with a pair of Red Sea raccoon butterflyfish (Chaetodon fasciatus), Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthya sp) Egypt, Red Sea.

Juergen Freund / Yellow-ribbon sweetlips (Plectorhinchus polytaenia) surrounded by dense shoal of glassy sweepers (Pempheris schomburgki). North Raja Ampat, West Papua, Indonesia

Fred Bavendam / Pygmy Sweeper (Parapriacanthus ransonneti) school, Komodo Island, Indonesia

Chris Newbert / Soft Coral (Dendronephthya sp) schooling Pygmy Sweeper (Parapriacanthus ransonneti) and Lionfish (Pterois volitans)

Chris Newbert / Pygmy Sweeper (Parapriacanthus ransonneti) in cave

Chris Newbert / Pygmy Sweeper (Parapriacanthus ransonneti) school in cave, Red Sea, Egypt

Chris Newbert / Soft Coral (Dendronephthya sp) outcroppings, Sea Fan (Subergorgia sp) and Glassfish (Parapriacanthus ransonneti)

Georgette Douwma / Kaleidoscopic image of Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthia sp.), Egypt, Red Sea.

Georgette Douwma / Kaleidoscopic image of Pygmy sweepers (Parapriacanthus guentheri) with soft corals (Dendronephthia sp.), Egypt, Red sea.

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

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

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

Norbert Wu / Sweeper (Parapriacanthus sp) and Pygmy Sweeper (Parapriacanthus ransonneti) school, Papua New Guinea

Alex Hyde / Goldenrod crab spider (Misumena vatia) eating a Chimney sweeper moth (Odezia atrata) Nordtirol, Austrian Alps, July.

Alex Hyde / Goldenrod crab spider (Misumena vatia) eating a Chimney sweeper moth (Odezia atrata) Nordtirol, Austrian Alps, July.

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 / School of Glassfish (Parapriacanthus guentheri) in the cargo hold of the SS Ulysses, Gubal Island, 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 soft corals (Dendronephthya sp.), encrusting sponges and Pygmy sweepers (Parapriacanthus ransonetti) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Lionfish (Pterois volitans) hunting Pygmy sweepers (Parapriacanthus ransonetti) Similian Islands, Andaman Sea, Thailand.

Georgette Douwma / Gorgonian sea fans (Melithaea sp.) with a large school of Pygmy sweepers (Parapriacanthus ransonetti) Andaman Sea, Thailand.

Georgette Douwma / Gorgonian sea fans with a large school of Pygmy sweepers (Parapriacanthus ransonetti) Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Gorgonian sea fans (Melithaea sp.) with a large school of Pygmy sweepers (Parapriacanthus ransonetti) Andaman Sea, Thailand.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) with a Gorgonian sea fan (Melithaea sp.) 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.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) surrounding a gorgonian coral, Andaman Sea, Thailand.

Georgette Douwma / Gorgonian sea fan (Melithaea sp.) and Soft corals (Dendronephthya sp.) with a large school of Pygmy sweepers (Parapriacanthus ransonetti) Andaman Sea, Thailand.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) on reef slope. Andaman Sea, Thailand.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) with gorgonian corals. Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonetti) shoal, Similan Islands, Andaman Sea, Thailand.

Pascal Kobeh / School of Yellow sweepers / glassfish (Parapriacanthus ransonneti / guentheri) Maldives. Indian Ocean.

Pascal Kobeh / School of yellow sweepers / glassfish (Parapriacanthus ransonneti / guentheri) on reef, coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / School of Yellow sweepers / Glassfish (Parapriacanthus ransonneti / guentheri) on reef with Lemonfish / Gold-spotted sweetlips (Plectorhinchus flavomaculatus), coast of Dhofar and Hallaniyat islands,...

Pascal Kobeh / School of Yellow sweepers / Glassfish (Parapriacanthus ransonneti / guentheri) on reef with Lemonfish / Gold-spotted sweetlips (Plectorhinchus flavomaculatus), coast of Dhofar and Hallaniyat islands,...

Pascal Kobeh / Crab possibly Horrid crab (Daldorfia horrida) in hard coral, coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / School of Yellow sweepers / Glassfish (Parapriacanthus ransonneti / guentheri) with a diver in the background, Madagascar. Indian Ocean. September 2012.

Pascal Kobeh / Diver taking a picture of a school of Yellow sweepers / Glassfish (Parapriacanthus ransonneti / guentheri) on a coral reef, Mayotte. Indian Ocean. February 2010.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) Egypt, Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) Egypt, Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) Egypt, Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) Egypt, Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) with soft corals (Dendronephthya sp) Egypt, Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) with soft corals (Dendronephthya sp) Egypt, Red Sea.

Georgette Douwma / Pygmy sweepers (Parapriacanthus ransonneti) Egypt, Red Sea.

Georgette Douwma / Coral reef scenery with Pygmy sweepers (Parapriacanthus guentheri) and soft corals (Dendronephthya sp) Egypt, Red Sea.

Georgette Douwma / Coral reef scenery with soft corals (Dendronephthya sp), a Coral hind (Cephalopholus miniata) and Pygmy sweepers (Parapriacanthus guentheri) Egypt, Red Sea.

Doug Perrine / Reef manta ray (Manta alfredi formerly Manta birostris) swimming over cleaning station on patch reef with Yellow / Golden sweepers (Parapriacanthus ransonetti) and other schooling fish, Hanifaru Bay e...

Fred Bavendam / Pygmy Sweeper (Parapriacanthus ransonneti) schooling near a coral, Adaman Sea, Thailand

Norbert Wu / Pygmy Sweeper (Parapriacanthus ransonneti) school in a coral cave, Komodo Island, Indonesia

Norbert Wu / Pygmy Sweeper (Parapriacanthus ransonneti) school in a coral cave, Raja Ampat Islands, Indonesia

Chris Newbert / Soft Coral (Dendronephthya sp) outcroppings and schooling Pigmy Sweeper (Parapriacanthus ransonneti) 60 feet deep, Red Sea, Egypt

Chris Newbert / Soft Coral (Dendronephthya sp) and Pigmy Sweeper (Parapriacanthus ransonneti) 50 feet deep, Red Sea Egypt

Chris Newbert / Leather Coral (Sarcophyton trocheliophorum) and Pigmy Sweeper (Parapriacanthus ransonneti), Red Sea, Egypt

Birgitte Wilms / Soft Coral (Dendronephthya sp,) and Pigmy Sweeper (Parapriacanthus ransonneti), Red Sea, Egypt

Chris Newbert / Pygmy Sweeper (Parapriacanthus ransonneti) inside wreck, Red Sea, Egypt

Chris Newbert / Leather Coral (Sarcophyton trocheliophorum) colony with polyps retracted, surrounded by schooling Pygmy Sweeper (Parapriacanthus ransonneti), sponges and soft coral, Red Sea

Norbert Wu / Pygmy Sweeper (Parapriacanthus ransonneti) school in coral cave, Indonesia

Chris Newbert / Pygmy Sweeper (Parapriacanthus ransonneti) school, inside cave at 40 feet, Red Sea, Egypt

Chris Newbert / Soft Coral (Dendronephthya sp) outcroppings, Pigmy Sweeper (Parapriacanthus ransonneti) and Anthias, (Pseudanthias sp)

Fred Bavendam / Pygmy Sweeper (Parapriacanthus ransonneti) school near a Soft Coral (Dendronephthya sp) in a small cave, Adaman Sea, Thailand

Fred Bavendam / Pygmy Sweeper (Parapriacanthus ransonneti) and Slender Cardinalfish (Rhabdamia gracilis) schooling near a Sea Fan, Andaman Sea, Thailand

David Fleetham / School of Pygmy / Yellow glassy sweepers (Parapriacanthus ransonneti), Indonesia.

Norbert Wu / Moon Wrasse (Thalassoma lunare) terminal phase male and Pygmy Sweeper (Parapriacanthus ransonneti) in coral reef, Papua New Guinea

Norbert Wu / Sweeper (Parapriacanthus sp) and Pygmy Sweeper (Parapriacanthus ransonneti) in coral reef, Papua New Guinea

Norbert Wu / Pygmy Sweeper (Parapriacanthus ransonneti) school of mixed ages, Papua New Guinea

Norbert Wu / Blue-striped Blenny (Plagiotremus rhinorhynchos) in Pygmy Sweeper (Parapriacanthus ransonneti) school, Papua New Guinea

Norbert Wu / Sweeper (Parapriacanthus sp) and Pygmy Sweeper (Parapriacanthus ransonneti) in coral reef, Papua New Guinea

Alex Mustard / School of Yellowtail sweepers (Pempheris schwenkii) inside the engine room of the Giannis D shipwreck, Abu Nuhas reef, Egypt, Gulf of Suez, Red Sea.

Alex Mustard / Schools of Glassfish (Parapriacanthus ransonneti) swimming through the inside of the wreck of the SS Carnatic, Abu Nuhas Reef, Egypt, Red Sea.

Alex Mustard / School of Glassfish (Parapriacanthus ransonneti) swirling past red soft corals (Dendronephthya sp.) growing on a shipwreck, Abu Nuhas Reef, Egypt., Red Sea.

Pascal Kobeh / A school of Red Sea dwarf sweepers (Parapriacanthus ransonneti) in the Giannis D wreck with a diver in the background, Red Sea, Egypt.

Pascal Kobeh / A school of Yellow sweepers (Parapriacanthus ransonneti) on the reef, Indian Ocean, Maldives.