FAMILY : GLAUCIDAE
Glaucus marginatus Bergh, 1860

10mm



Dorsal surface, which faces downward as animal floats upside down on the surface of
the ocean (Pleuston). This is the smaller of two similar pleustonic species which are blown
ashore during periods of strong onshore winds. The other being Glaucus atlanticus Forster 1777.

Feeding on the "By-the-wind sailor" (Velella velella). Also feeds on the Portuguese
man-o'-war, commonly known as the Bluebottle (Physalia physalis) and below on
Porpita porpita.

Mating sequence shown below

© All images Copyright 2013 Denis Riek. All rights reserved.