What two very different groups of crustaceans are commonly referred to by the moniker "sea cockroach"?
Answer
Giant Isopods and Sea Slaters (genus Ligia)
The confusion surrounding the term stems from it applying to the massive, deep-sea dwelling Giant Isopods and the much smaller, shore-hugging crustaceans belonging to the genus Ligia, known as sea slaters.

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What two very different groups of crustaceans are commonly referred to by the moniker "sea cockroach"?What fundamental biological classification separates sea cockroaches from true cockroaches?How many pairs of legs do isopods (sea cockroaches) possess, which distinguishes them from true insects?What is the typical maximum size reached by the deep-sea Giant Isopods mentioned?Which genus primarily comprises the smaller, shore-hugging creatures known as sea slaters or sea roaches?What defines the water dependency characteristic of coastal Sea Slaters (Ligia spp.)?What specialized physiological adaptation allows deep-sea Giant Isopods to survive infrequent meals?What is the primary diet strategy of the coastal Sea Slaters in the intertidal zone?Which specific species of Ligia is frequently noted to inhabit the coasts of the UK?What fundamental biological group do both Giant Isopods and Sea Slaters share?What distinguishing feature, besides leg count, separates isopods from most insects according to the text?