Muggiaea atlantica

Taxon-Order: 
Siphonophorae

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Distribution: 
Pacific ocean, Atlantic ocean and the Mediterranean Sea.
Habitat: 
Neritic, nearshore.
Size: 
Anterior nectophore up to 11 mm in height.
Diet: 
Small crustaceans, mostly copepods.
Useful Facts or Characters: 

The anterior nectophore  (swimming bell) has five complete longitudinal ridges.  The somatocyst extends to 4/5 the length of the nectophore and the hydroecium extends to 3/10 the length of the nectophore.

Natural History: 

Can be very common in shallow waters.

References: 

http://siphonophores.org/SiphOrganization.php

Mapstone, G.M. (2009)  Siphonophora (Cnidaria: Hydrozoa) of Canadian Pacific Waters. Canadian Science Publishing, NRC Research Press, Ottawa.