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'Remipedia' is a class of blind crustaceans found in deep caves connected to salt water, in Australia and the Caribbean Sea. The first described remipede was the fossil ''Tesnusocaris goldichi'' (Lower Pennsylvanian), but, since 1979, about a dozen living species have been found. These species have been assigned to one order Nectiopoda and two families Godzilliidae and Speleonectidae.
Members of this group are colourless with a head and up to thirty-two similar body segments composing an elongate trunk. The swimming appendages are lateral on each segment, and the animals swim on their backs. They are generally slow-moving. They have fangs connected to secretory glands; it is still unknown whether these glands secrete digestive juices or poisonous venom, or whether remipedes feed primarily on detritus or on living organisms. They have a generally primitive body plan in crustacean terms, and have been thought to be a basal, ancestral crustacean group. However, Fanenbruck ''et al.'' (2004) showed that at least one species, ''Godzilliognomus frondosus'', has a highly organised and well-differentiated brain, with a particularly large olfactory area (not surprising in a species that lives essentially without light). The size and complexity of the brain suggested to Fanenbruck ''et al.'' that Remipedia might be the sister taxon to Malacostraca, regarded as the most advanced of the crustaceans. This is also one of the reasons why it is included in the Pancrustacea hypothesis, a hypothethical clade of probably the most advanced Mandibulata.

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References

★ Fanenbruck, M., Harzsch, S., & Wägele, J. W. (2004). The brain of the Remipedia (Crustacea) and an alternative hypothesis on their phylogenetic relationships. ''Proceedings of the National Academy of Sciences''. Published online 5th March 2004.