Sue Daly / Parasitic isopod (Anilocra frontalis) on Goldsinny wrasse (Ctenolabrus rupestris) Sark, British Channel Islands, August.

Sue Daly / Female Cuckoo wrasse (Labrus mixtus) with pair of parasites (Anilocra frontalis) L'Etac, Sark, British Channel Islands.

Sue Daly / Female Cuckoo Wrasse (Labrus mixtus) with parasites (Anilocra frontalis). Guillaumesse, Sark, British Channel Islands, July.

Pete Oxford / Cymothoid isopod (Anilocra spp or Renocila spp) on Creolefish (Paranthias furcifer) Bonaire, Netherlands Antilles, Caribbean

Peter Scoones / Parasitic isopod (Anilocra sp) on Creole fish (Paranthias furcifer) Bonaire, Netherlands Antilles, Caribbean photographed during making of BBC Planet Earth series 2005

Pascal Kobeh / Blue chromis (Chromis cyanea) with attached parasitic Isopod (Anilocra sp) female feeding on blood, in reef. Bahamas.

Pascal Kobeh / Blue chromis (Chromis cyanea) with parasitic Isopod (Anilocra sp) female feeding on blood. Male isopods invisible to naked eye, female excretes a chemical substance to maintain masculinity of small ma...