Alex Mustard / Planktonic sea walnut ctenophore (Mnemiopsis mccradyi) in open water, Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Ingo Arndt / Ctenophore (Beroe cucumis) showing typical symmetrical combs made of cilia, Weddell Sea, Antarctica

Norbert Wu / Ctenophore (Beroe cucumis) voracious, large mouth, Arctic

Alex Mustard / Ctenophore (Bolinopsis sp.) in a sea loch, with sun. Loch Fyne, Scotland, Great Britain.

Doug Perrine / Comb jelly / sea gooseberry (Hormiphora palmata) diffracting light through cilia (fine hair-like structures) on the comb rows, Kailua Kona, Hawaii, USA.

Doug Perrine / Close-up of Ctenes or Comb plates (Eurhamphaea vexilligera) a translucent gelatinous organism with colors produced by the diffraction of light through cilia. Kailua Kona, Hawaii, USA.

Suzi Eszterhas / Comb Jelly (Leucothea pulchra), native to Pacific Ocean

Jordi Chias / Fin whale (Balaenoptera physalus) with ctenophore in front of its mouth, south Barcelona coast, Spain, Mediterranean Sea

Graham Eaton / Comb jellyfish (Bolinopsis infundibulum) in shallow water and kelp, Bersoch, Cardigan Bay, Wales, UK July

Franco Banfi / Venus girdle comb jelly (Cestum veneris) San Benedicto island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico

Franco Banfi / Comb jelly (Ctenophora) Roca Partida close to San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve, Socorro Islands, Western Mexico

Franco Banfi / Comb jelly (Ctenophora) Roca Partida close to San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve, Socorro Islands, Western Mexico