SARCODINA, PROTEOMYXA 289 



may show an amoeboid or flagellate phase owing to differences in 

 environmental conditions. 



The Sarcodina are divided into two subclasses as follows: 



With lobopodia, rhizopodia, or filopodia 



Subclass 1 Rhizopoda 



With axopodia Subclass 2 Actinopoda (p. 356) 



Subclass 1 Rhizopoda Siebold 



The name Rhizopoda has often been used to designate the 

 entire class, but it is used here for one of the subclasses, which is 

 further subdivided into five orders, as follows : 



Without test or shell 



With radiating pseudopodia Order 1 Proteomyxa 



With rhizopodia; forming Plasmodium 



Order 2 Mycetozoa (p. 296) 



With lobopodia Order 3 Amoebina (p. 304) 



With test or shell 



Test single-chambered; chitinous Order 4 Testacea (p. 323) 



Test 1- to many -chambered; calcareous 



Order 5 Foraminifera (p. 344) 



Order 1 Proteomyxa Lankester 



A number of incompletely known Rhizopods are placed in this 

 group. The pseudopodia are filopodia which often branch or 

 anastomose with one another. In this respect the Proteomyxa 

 show affinity to the Mycetozoa. Flagellate swarmers and encyst- 

 ment occur commonly. The majority of Proteomyxa lead para- 

 sitic life in algae or higher plants in fresh or salt water. 



Pseudoplasmodium-formation 



Family 1 Labyrinthulidae 



Solitary and Heliozoa-like 



With flagellate swarmers . . . Family 2 Pseudosporidae (p. 290) 

 Without flagellate swarmers . Family 3 Vampyrelhdae (p. 290) 



Family 1 Labyrinthulidae Haeckel 



Small fusiform protoplasmic masses are grouped in network of 

 sparingly branched and anastomosing filopodia; individuals 

 encyst independently; with or without flagellate stages. 



Genus Labyrinthula Cienkowski. Minute forms feeding on 

 various species of algae in fresh or salt water; often brightly 

 colored due to the chlorophyll bodies taken in as food. 



