THE WATER FLEAS (CLADOCERA) 



70s 



73 (74) Valves smooth; ephippium reticulated around edges, smooth in 

 middle; antennules of male with sense seta near middle. 



Moina rectirostris (Leydig) i860. 



Colorless, or with bluish cast. Head extended or Uttle depressed; deep cervical and supra- 

 ocular depressions. Post-abdomen with long 

 projection and 10-15 post-anal spines and 

 bident. Claws pectinate. Antennules of $ 

 with 5-6 hooks at apex. Length, 9, 1.0-2.0 

 mm.; J, 0.4-0.6 to i.o mm. 



Widely distrib- 

 uted; in muddy 

 pools. 



Fig. 1092. Male antennule. A, Moinaredirosiris. B, M. affinis. 

 C, M. macrocopa. 



0.1 MM. ^^ 



Fig. 1093. Ephippium. A, Moina 

 rectirostris. B, M. affinis. C; M. 

 macrocopa, {A and C after Lillje- 

 borg.) 



74 (73) Valves striate; ephippium reticulated all over; antennules of male 

 with sense seta near base. . . Moina affinis Birge 1893. 



005 MM i- 



Much Uke M. rectirostris, from which the 

 young 9 ^re hardly distinguishable. Anten- 

 nules of ij broad, fringed with fine hairs on 

 inner margin; 4-6 hooks at end. Length, J, 

 0.8-1 .0 mm. ; $ , 0.3-0.6 mm. 



Wisconsin to Louisiana. 



M. rectirostris, affinis, and brachiata, have 

 been often confused in faunal hsts. 



Fig. 1094. Moina ajjinis, apex of post-abdomen. 



75(70) No supra-ocular depression; claws not pectinate; antennules of male 

 with sense seta in middle or below; first foot of male 

 with long flagellum. . Moina macrocopa Straus 1820. 



Not very transparent; yellowish or greenish. Head extended. 

 Terminal part of post-abdomen long, with 10-12 spines besides 

 bident. Two ephippial eggs. J with elongated head; 5-6 hooks 

 on antennule. Length, 9 . to 1.8 mm.; J , 0.5-0.6 mm. 



Pools, Wisconsin, Nebraska, Colorado, N. Dakota; doubtless 

 widely distributed. 



This species is M. paradoxa Weismann and M. flagellata Hu- 

 dendorf. 



Fig. 1095. Moina macrocopa. 



0.2 MM, 



