NAME: Sea swallow (Glaucus atlanticus)
DISTRIBUTION: Circumtropical. An open ocean species sometimes found washed up on beaches from False Bay to KZN. Ocean surface.
DESCRIPTION: A bluish-silvery animal with a flattened body and cerata.
NATURAL HISTORY: Eats bluebottles such as Physalia and relatives. Utilises the stinging cells of the prey for its own defence. Gulps air to stay afloat. Egg mass unknown. Floats upside down.
Familiarize yourself with these interesting creatures and other marine animals for your next dive. For more information grab a copy of this book “A Field Guide to the Marine Animals of the Cape Peninsula” by Georgina Jones available in Pisces Divers.