Journal of the Marine Biological Association of the UK

Research Article

Morphological abnormalities in the stauromedusa Haliclystus auricula (Cnidaria) and their possible causes

Carolina J. Zagala1 c1

a1 Centre for Research on the Ecological Impacts of Coastal Cities, Marine Ecology Laboratories A11, the University of Sydney, New South Wales 2006, Australia


Morphological abnormalities were observed in a population of the stauromedusa Haliclystus auricula in southern Chile. A total of 144 abnormal specimens was observed out of 3790 Stauromedusae sampled. The following abnormalities are described: individuals lacking arms (73%), with more than eight anchors (11%), more than eight arms (8%), lacking anchors (4%) and one individual with tentacles in abnormal locations. An individual with two peduncles, one with two mouths and one twin-like individual are recorded for the first time in this species. Their possible causes are discussed.

(Received January 09 2007)

(Accepted December 03 2007)


c1 Correspondence should be addressed to: Carolina J. Zagal Centre for Research on the Ecological Impacts of Coastal Cities Marine Ecology Laboratories A11 The University of Sydney New South Wales 2006 Australia email: