Survey of the Animal Kingdom 275 



(Fig. 76), also considered as a plant, Ceratium (Fig. 76), Chilomonas (Fig. 76), 

 Uroglena (Fig. 259), Dinohryon (Fig. 260), and Synura (Fig. 261). 



Subclass B — Zoomastigina (zo o mas ti -ji' na) (Gr. zoon, animal; mas- 

 tigion, whip or flagellum). — These flagellated Protozoa are animal-like and do 

 not possess chromatophores. 



Examples: Mastigamoeba (Fig. 76), Tetramitus (Fig. 76), Monosiga (Fig. 

 76),' Bodo (Fig. 76), Cercomonas (Fig. 76), and such pathogenic species as 

 Trypanosoma gambiense (Fig. 263), which causes African sleeping sickness, and 

 Trypanosoma brucei (Fig. 266), which causes a serious disease in animals in 

 Africa (see chapter on Economic Importance of Animals). 



— Pseudopodltun — t:^^.^"',' 



Shell- 







eudopodium -|f jy| |/|Y'I '^'^ 



D 



^ — Pseudopodliim— , — ^ f 



Fig. 75. — Representative protozoa of the class Sarcodina. A, Protomonas 

 amyli; B, Rotalia beccarii; C, Globigerina bulloides; D, Allogromia sp.; E. Amoeba 

 proteus; F, Arcella vulgaris; G, Difflugia oblonga; H, Centropyxis aculeata; I, 

 Actinophrys sol; J, Thalassicola nucleata. - (All enlarged and somewhat dia- 

 grammatic. 



Class 3 — Sporozoa (spo ro -zo' a) (Gr. spora, spore or seed; zoon, animal). 

 — These Protozoa possess no locomotor organelles in the adult stages, although 

 in certain immature stages they may move about by different means. All species 

 reproduce by spores which are small bodies surrounded by a resistant membrane 

 (sporocyst). All species are parasitic and none appears in fresh water. The adults 

 absorb foods through their cells. Many Sporozoa have a very complicated life 

 cycle, spending part of their life in one species of animal and probably another 

 part of the cycle in a different species. The animals in which such parasites live 

 are known as hosts. 



Examples: Monocystis (Fig. 77), a parasite of worms and arthropods; Plas- 

 modium malariae (Fig. 176), which causes human malaria (quartan type) with an 



