The family Glaucidae has just two genera, Glaucus and Glaucilla and each of these genera have just one species: Glaucus atlanticus and Glaucilla marginata.Glaucus atlanticus:
- can be up to 3cm in size
- the species has up to 84 cerata - outgrowths on the upper surfaces of the body
- the cerata hold the stinging cells (nematocysts) which are taken from the jellyfish they eat and are stored in special sacs called cnidosacs
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