Jassa marmorata

Jassa marmorata is a species of tube-building amphipod. It is native to the northeast Atlantic Ocean but has been introduced into northeast Asia. J. marmorata are greyish in colour with reddish brown markings. The can grow to a length of up to 10 millimetres (0.39 in). They are generally found in fouling communities and intertidal areas where they build tubes of detritus and algae fragments using silky mucus secretions.^[1][2][3] They are remarkable for having two distinct morphs of males with two different mating strategies. The 'major' morphs are fighter males, while the 'minor' morphs are sneaker males.^[4]

Jassa marmorata
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Amphipoda
Family:	Ischyroceridae
Genus:	Jassa
Species:	J. marmorata
Binomial name
Jassa marmorata Holmes, 1905

J. marmorata is classified under the genus Jassa of the family Ischyroceridae. They are commonly confused with the closely related scud (Jassa falcata).^[5]