CHAPTER VI 



THE MALACOSTRACA 



SUB-CLASS MALACOSTRACA, Latreille (1806). 

 SERIES I. LEPTOSTRACA. 



DIVISION PHYLLOCARIDA. 

 Order Nebaliacea. 



SERIES II. EUMALACOSTRACA. 

 DIVISION 1. SYNCARIDA. 

 Order Anaspidacea. 



DIVISION 2. PERACARIDA. 



Order 1. Mysidacea. 

 2. Cumacea. 

 3. Tanaidacea. 

 4. Isopoda. 

 5. Amphipoda. 



DIVISION 3. EUCARIDA. 



Order 1. Euphausiacea. 

 2. Decapoda. 



DIVISION 4. HOPLOCARIDA. 



Order Stomatopoda. 



Definition. Crustacea in which the carapace is variously 

 developed or may be vestigial ; there are typically fourteen (rarely 

 fifteen) trunk - somites, all of which (except the fifteenth) bear 

 appendages ; the telson rarely has a caudal furca ; antennules often 

 biramous ; the mandibles may/ have a palp ; the trunk-limbs are 

 differentiated into two tagmata, a thoracic of eight and an 

 abdominal of six pairs ; female genital apertures on the sixth, 



143 



