These primitive crustaceans, which were discovered in submerged caves only in 1980, have a long trunk made up of many segments, each bearing a pair of biramous swimming appendages. Not much is known of their biology.

 

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References:

 

Hickman, C.P. and L. S. Roberts. 1994. Animal Diversity. Wm. C. Brown, Dubuque, IA.

 

Brusca, R. C., and G. J. Brusca. Invertebrates. 1990. Sinauer Associates, Sunderland, MA.

 

Pearse, V., J. Pearse, M. Buchsbaum, and R. Buchsbaum. 1987. Living Invertebrates. Blackwell Scientific Publications, Palo Alto, Ca.