Cumaceans are primarily described as deposit feeders in shallow burrows, feeding on organic materials and microorganisms. They are known to graze on algae growing on sand grains. However, the ecology of these organisms has been only superficially explored and future research will certainly reveal a broader range of lifestyles, as exemplified by members the family Nannastacidae, which have piercing mandibles and may prey on polychaetes and foraminifora, and species in the families Gynodiastylidae and Vaunthomsoniinae which have modified legs or feeding tubules for filter-feeding.
(Brusca and Brusca 2003; Kozloff 1990)
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