ARTHROPODA 239 



Order COPEPODA 



(Small size; body long, segmented; four to five pairs of once-branched appendages on 



thorax; abdomen without appendages; abundant in fresh and 



salt water; many forms parasitic) 



Genera 

 Cyclops 

 Cetochilus 

 Sapphirlna 

 Siphonostomata 

 Nicothoe 



Order CIBEIPEDIA 



(Imperfectly segmented; fixed or parasitic during adult life; inclosed in skin 



strengthened by calcareous plates; abdomen rudimentary; 



appendages biramous, usually six pairs) 



Suborders Genera Species 



!L. anatifera 

 L. striata 

 L. pectinata 

 B. balanoides 

 B. eburneus 

 Balanus -( B. rugosus 



B. yeniculatus 



?. tintinnabulum 

 RHIZOCEPHALA C Sacculina (parasitic on crabs) 



(Parasitic) ) feltogaster (parasitic on hermit-crabs) 



Subclass 

 Malacostraca 



(Highly organized Crustacea, usually of considerable size; appendages much differentiated) 



Order PHYLLOCAEIDA 



(Small; covered with bivalved carapace,- thoracic feet leaf -like ,- abdominal feet 



biramous; posterior segment terminates in two long spines; 



mostly fresh-water species) 



Order SCHIZOPODA 



(Small; transparent; shrimp-like,- thorax more or less completely covered with soft 

 carapace; thoracic appendages biramous; eyes on stalks) 



Mysis M. sternolepis 



( Without gills or thoracic legs) 



Euphausia 



( With gills or thoracic legs) 



