ROLL CALL 



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PHYLUM VII — TROCHELMINTHES — Rotifers, Gastrotricha. 



Characteristics : Small, frequently microscopic, identifiable by cilia around 

 the mouth region ; about 1300 species. 



Class I — Rotifera — Wheel animalcules (Philodina, Notommata, Trocho- 

 sphaera). 

 Characteristics : Mostly free-living, inhabiting fresh water ; distinct nerv- 

 ous system ; universally characterized by presence of jaws inside pharynx 

 (mastax) ; usually a foot. 



Class II — Gastrotricha — (Chaetonotus). 



Char.acteristics : Microscopic organisms reaching maximum length of 

 about 0.5 mm. ; animal divided into indistinct head, neck, and body ; oral 

 bristles on side of head ; often a forked tail containing cement glands ; 

 locomotion by ciliary bands or by long bristles. 



