gnathopoda

Definitions

The xiphosures or horseshoe crabs regarded as an order of Arachnida.
In some systems of classification, a subclass or suborder of Crustacea, corresponding to Entomostraca in a broad sense; the lower series of the crustaceans, contrasted with the malacostracans or Thoracipoda.
An exact synonym of Arthropoda considered as a prime division of a phylum Appendiculata (which see).

Sorry, no etymologies found.

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At the time of birth, the larva, like that of the Brachyura, has only the two gnathopoda developed, whilst the termination of the tail is like that of a fish, as in the Macrura.

Journal of the Proceedings of the Linnean Society - Vol. 3 Zoology Various
Foot of the second pair ( "second pair of gnathopoda") of the male of Orchestia Tucurauna, magnified 15 diam.

Facts and Arguments for Darwin Fritz Muller 1859
This applies also to the young males of the Shore-hoppers (Orchestia) with regard to the second pair of anterior feet (gnathopoda).

Facts and Arguments for Darwin Fritz Muller 1859
Feet of a nearly adult male of the same species; 44 and 47 from the first pair of anterior feet (gnathopoda); 44 and 48 from the first, and 46 and 49 from the last pair of thoracic feet.

Facts and Arguments for Darwin Fritz Muller 1859
Foot of the second pair ( "second pair of gnathopoda") of the female of Orchestia Tucurauna, magnified 15 diam.)

Facts and Arguments for Darwin Fritz Muller 1859
The difference of the sexes which, in the Gammarinae is usually expressed chiefly in the structure of the anterior feet (gnathopoda, Sp. Bate) and in the Hyperinae in the structure of the antennae, is often so great that males and females have been described as distinct species, and even repeatedly placed in different genera (Orchestia and Talitrus,

Facts and Arguments for Darwin Fritz Muller 1859