CRYPTOMONADINA 185 



Suborder 1 Eucryptomonadina Pascher 



Truncate anteriorly; 2 anterior flagella; with an oblique furrow near 

 anterior end Familj^ 1 Cryptomonadidae 



Reniform; with 2 lateral flagella; furrow equatorial 



Family 2 Nephroselmidae (p. 186) 



Family 1 Cryptomonadidae Stein 



Genus Cryptomonas Ehrenberg. Body elliptical with a firm 

 pellicle; anterior end truncate; dorsal side convex, ventral side 

 slightly so or flat; nucleus posterior; longitudinal furrow; tubular 

 cavity extending to the middle of body, through which equally 

 long flagella arise; 2 lateral chromatophores vary in color from 

 green to blue-green, brown or rarely red; holophytic; with small 

 starch-like bodies which stain blue in iodine; 1-3 contractile 

 vacuoles anterior; fresh water. Several species. 



C. ovata E. (Fig. 89, a). 20-30/i long; among vegetation. 



Genus Chilomonas Ehrenberg. Similar to Cryptomonas in 

 general body form and structure, but colorless because of the 

 absence of chromatophores; without pyrenoid; cytopharynx deep, 

 lower half marked by "rudimentary trichocysts" ; 1-2 contractile 

 vacuoles, anterior; nucleus in posterior half; endoplasm often 

 filled with polygonal starch grains; fresh water. 



C. Paramecium E. (Fig. 89, h). Posterior end narrowed, slightly 

 bent "dorsally"; 20-40^1 long; saprozoic; widely distributed in 

 stagnant water and hay infusion. 



C. ohlonga Pascher. Oblong; posterior end broadly rounded; 

 20-50m long. 



Genus Chrysidella Pascher. Somewhat similar to Cryptomonas^ 

 but much smaller; yellow chromatophores much shorter; those 

 occurring in Foraminifera or Radiolaria as symbionts are known 

 as Zooxanthellae. Several species. 



C. schaudinni (Winter) (Fig. 89, c, d). Body less than lO/i long; 

 in the foraminiferan Peneroplis pertusus. 



Genus Cyathomonas Fromentel. Body small, somewhat oval; 

 without chromatophores; much flattened; anterior end obliquely 

 truncate; with 2 equal or subequal anterior flagella; colorless; 

 nucleus central; anabolic products, stained red or reddish violet 

 by iodine; contractile vacuole usually anterior; a row of refractile 

 granules, protrichocysts (p. 65), close and parallel to anterior 

 margin of body; asexual reproduction by longitudinal fission; 

 holozoic; in stagnant water and infusion. One species. 



