COPEPODA FROM IFALUK ATOLL 213 



Genus Metamphiascopsis Lang, 1944 

 Metamphiascopsis hirsutus (Thompson and A. Scott, 1903) 



Figures 82-86 

 Daciylophusia hirsvta Thompson and A. Scott, 1903, p. 269, pi. 9 (figs. 19-24). 

 Amphiascus /uVswiws.— Nicholls, 1939, p. 262.— Sewell, 1940, pp. 126, 247, 358, 



363, 375, figs. 50, 51. 

 Amphiascopsis hirsutus. — Nicholls, 1941b, pp. 75, 77; 1942a, p. 136; 1945, p. 5. — 



Kj-ishnaswamy, 1953a, p. 70. 

 Metamphiascopsis hirsutus. — Lang, 1944, p. 19; 1948, p. 683, fig. 275 (no. 1). 

 Dactylopus maldivensis Wolfenden, 1905, p. 1031, pi. 99 (figs. 34-41). 



Material. — Loc. 81-A-3-d, 1 9 cop. stage V, 0.83 mm. Loc. 

 592, 1 ad. cT, 0.86 mm. 



Description. — Both specimens mentioned above will be described; 

 they have been dissected and momited. 



Female, copepodite stage V, total length 0.83 mm.; proportional 

 length of cephalothorax and abdomen is 7:4. 



Bod}'- moderately slender, greatest diameter at end of cephalic 

 somite, narrowing anteriorly and posteriorly, with indistinct separa- 

 tion of cephalothorax and abdomen. Head and 1st thoracic somite 

 fused to form cephalic somite, which is longer than combined lengths 

 of thoracic somites 2 to 4. Back, in lateral aspect, smoothly cm"ved, 

 curve continuing in the rostrum (fig. 85). Rostrum big, a triangular 

 plate in front of cephalic somite, downwardly curved, separated from 

 head by shallow groove, length equal to combined lengths of anten- 

 nular segments 1 and 2. Lateral parts of cephalic somite well pro- 

 duced to shield oral appendages, posterolateral corner slightly 

 produced. Thoracic somites 2 to 4 of equal length, epimeral plates 

 rounded and slightly produced laterocaudally. 



5th thoracic somite a narrow ring, visible in both dorsal and lateral 

 aspects. Abdomen incompletely developed, 4-segmented, 4th and 

 5th somites fused. Genital somite well developed, as long as 2nd 

 abdominal somite, with 2 rows of spinules on distal part of latero- 

 dorsal wall. 2nd and 3rd somites with completely closed row of 

 spinules along distal ends. Fused 4th and 5th somites fairly long, 

 line of separation wealdy indicated, with row of spinules on ventral 

 wall near that line of fusion. Insertion of caudal rami on anal somite 

 fringed with spinules. Furca as in adult male, to be described below. 



Antennules 9-segmented; setation represented in figm-e 86a. In its 

 development the antennule has reached its fuial stage. 



Antenna and mouth parts both in development and setation as in 

 the adult stage, and therefore not described in detail here. 



Leg 1 (%. 866) as in the adult stage, without difference in setation. 



