. Bulletin - United States National Museum. Science. MARINE GAMMARIDEAN AMPHIPODA 233 place in Gammaridea Family Key A (p. 109). Its uropod 3 is even more typically that of an ischyrocerid than is uropod 3 of Parapherusa. Another 13 genera of Gammaridae (in couplets 6-18) have vestigial accessory flagella and cleft telsons and thus resemble Eusiridae. All Eusiridae except Eusirogenes Stebbing have elongate telsons and that genus is easily recognizable as a eusirid in its gnathopodal morphology. Eusiridae also have slightly enlarged metasomal segments, the meta- some having the length of 6 i)er
. Bulletin - United States National Museum. Science. MARINE GAMMARIDEAN AMPHIPODA 233 place in Gammaridea Family Key A (p. 109). Its uropod 3 is even more typically that of an ischyrocerid than is uropod 3 of Parapherusa. Another 13 genera of Gammaridae (in couplets 6-18) have vestigial accessory flagella and cleft telsons and thus resemble Eusiridae. All Eusiridae except Eusirogenes Stebbing have elongate telsons and that genus is easily recognizable as a eusirid in its gnathopodal morphology. Eusiridae also have slightly enlarged metasomal segments, the meta- some having the length of 6 i)ereonal segments, whereas gammarids have a metasome the length of only 5 pereonal segments. This is a. Figure 95.—Gammaridae: a, Melita dentata (Krdyer) (Sars, 1895, pi. 181). Mouthparts of Elasmopus rapax Costa (Sars, 1895, pi. 183): b, upper lip; c, lower lip; e, mandible; f,g, maxillae 1, 2; h, maxilliped. Lower lip: d, Gammarellus honiari (Fabricius) (Sars, 1895, pi. 172). Gnathopod 2: f, Elasmopus; j, Cheirocratus sundevalli (Rathke) (Sars, 1895, pi. 184). Gnathopod 1: k, Elasmopus; I, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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