COPEPODA FROM IFALTJK ATOLL 251 



Family Ameiridae MoDard, 1927 



Genus Ameira Boeck, 1864 

 Ameira longipes Boeck, 1864 



Figures 100-102 



Ameira longipes Boeck, 1864, p. 273. — Marine Biological Association, 1931, p. 

 165.— Nicholls, 1939, p. 271.— Monk, 19-11, p. 98, pi. 2 (figs. 12, 13).— 

 Lang, 1944, p. 24; 1948, p. 788, figs. 316 (no. 1), 317 (no. 1).— Klie, 1950, p. 

 88. — Noodt, 1955, p. 771. — Marine Biological Association, 1957, p. 169. — 

 Roe, 1958, pp. 230, 250, fig. 130.— Wieser, 1959, pp. 107-110. 



Material.— Loc. 590, ad. d', 0.33 mm. Loc. 594, 1 ad. 9, 0.41 

 mm. Loc. 638, 1 ad. 9, 0.36 mm.; 2 ad. cf d', 0.35 and 0.37 mm. 



Description. — The female specimen from locality 594 and the male 

 from locaUty 590 have been completely described, dissected, and 

 mounted. 



Adult female, total length 0.41 mm.; greatest diameter 0.12 

 mm.; length of longest furcal seta 0.26 mm. 



General shape of body in dorsal aspect fairly slender, with cephalo- 

 thorax and abdomen well separated (fig. 100a). Cephalo thorax 

 ovate, abdomen elongate; thoracic portion in lateral view considerably 

 curved, whole back and head curved and rounding into small rostrum, 

 which is almost invisible from the side since it is obscured completely 

 by antennules (fig. 1006). Rostrum in dorsal view visible as minor, 

 rounded protuberance in front of head. Head and 1st thoracic somite 

 fused to form cephahc somite, slightly longer than combined lengths 

 of thoracic somites 2 and 3. Greatest diameter of body at end of 

 cephalic somite, anteriorly narrowing rapidly, posteriorly narrowing 

 very little until 4th thoracic somite is reached. Sides of cephahc somite 

 moderately produced, epimeral plates of thoracic somites 2-4 rounded. 



5th thoracic somite prominent both in lateral and dorsal view; geni- 

 tal somite with distinct line of fusion between somites 1 and 2. Length 

 of genital somite equal to combined lengths of somites 3 to 4 ; these last 

 somites have about same length. Anal somite longer than preceding 

 somite, about as long as wide, with narrowly rounded anal plate. 

 Rami of furca (fig. 101/) widely separated, parallel, slightly wider than 

 long (width 18/x, length 14^)- Each furcal ramus with 5 marginal 

 setae and 1 appendicular seta. Setae 1, 4, and 5 fine and short, ap- 

 pendicular seta slightly longer. Setae 2 and 3 lengthened and thick- 

 ened, especially 2nd, which reaches more than half body length. No 

 spinules on cephalic or abdominal somites, nor on furca. 



Antennules 8-segmented, reaching end of cephalic somite. 



Antenna with basis and endopodite separate. Exopodite short, 

 1-segmented, with 3 setae and short spine. Mandibular palp absent. 



