PAND ARID AE — CRE SSE Y 



69 



The last segment bears a smaller number of naked setae in all cases. 

 This appendage is not of great taxonomic importance on the generic 

 or specific level. 



Second antenna: This appendage is well developed in all members and 

 serves as a principal means of attachment. The tip is always in the 

 form of a claw and this reaches its greatest development in the females 

 of the genera Phyllothereus and Gangliopus (see fig. 127). These 

 genera, as previously pointed out, show a reduction in adhesion pads 

 and also are the only pandarids found routinely on the gill filaments. 

 In view of this location on the host, adhesion pads would not be as 



Table 2. — Arrangement of female cephalic adhesion pads in genera of the family 

 Pandaridae ( + =present, —= absent) 



useful whereas a well-developed claw to envelope the gill filament 

 would be. The terminal claw always bears 2 setae. 



Mouth tube: The mouth tube is composed of the labrum and labium, 

 forming a conelike structure, ^vithin which is housed the stylus of the 

 mandible. The tip of the labium is fringed (see figs. 6, 167, 251). 

 The labium extends beyond the tip of the labrum. The labrum bears 

 2 accessory spinelike structures at its tip (see fig. 251). 



Mandible: The mandible is composed of a basal segment located 

 near the base of the mouth tube and a long stylet projecting within 

 the tube. The tip of the stylet is armed with 10-12 teeth. This 

 appendage is of little taxonomic value and shows little variation from 

 species to species in both sexes. 



First maxilla: This appendage is attached laterally to the base of 



