TEMPORARY POND COMMUNITIES 



177 



the ostracod (Cyprois marglnata X147) (Fig. 129), and the fairy shrimp 

 (Eubranchipus) (148) (Fig. 130), all of which are characteristic of tempo- 

 rary ponds. Red mites (Fig. 131) are also common (149). 



Professor Child (unpublished) has noted that the distribution each 

 spring of Eubranchipus and of other temporary pond species is modified 



Temporary Grassy Pond Animals 



Fig. 127. — A temporary pond copepod {Cyclops viridis americanus Marsh); 35 

 times natural size (after Herrick and Turner) . 



Fig. 128. — The red copepod (Diaptomus stagnalis) from temporary pond; 12 

 times natural size, left antenna omitted (after Herrick and Turner). 



Fig. 129 — The temporary pond ostracod {Cyprois marginata); 35 times natural 

 size (after Sharp). 



Fig. 130. — The fairy shrimp (Eubranchipus); 3 times natural size. 



Fig. 131. — The red mite (Hydrachna sp.); 10 times natural size. 



by the rainfall of the preceding season. When the rainfall of the pre- 

 ceding season has been great, the temporary pond species are found only 

 in the smallest and highest (above ground-water) ponds such as would 



