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1893 T. R. R. Stebbing Hist. Crustacea iv. 36 In describing a crustacean appendage he [sc. T. H. Huxley] names the first two joints the protopodite, which bears on its extremity on the inner side the endopodite, and on the outer side the exopodite. For these terms the shortened forms exopod and endopod will here be preferred—exopod for exopodite, and endopod for endopodite and protopodite combined.

1959 Chambers's Encycl. IV. 278/2 In the walking legs of crabs and lobsters only the endopod remains, but in the corresponding thoracic limbs of some more primitive Malacostra the exopod is presented as a many-pointed flagellum and is used for swimming.