518 U.S. NATIONAL MUSEUM BULLETIN 271 



7: Fit of this dactyl to palm: congruent, overlapping, not fitting. Shape and 

 ornaments: claw-like (normal); vestigial; absent (rare); with special setae, 

 spines, or processes. 



Sexual dimorphism in female: gnathopod 2 like male but much smaller, like gnath- 

 opod 1 and of similar size, like gnathopod 1 but larger, 



PEREOPODS 1-2 



Internal glands present or absent. 



Orientation of pereopod 2 like that of pereopod 3 (Eohaustorius). 



Chelate or prehensile. 



Articles 4-5, 4-6, or 4, 5, 6 inflated strongly (rare). 



Article 4 extraordinarily elongate (Ampeliscidae, Hyperiopsidae). 



Special spines on article 6 near claw: spines striate, hooked. 



Article 7 absent (Haustoriidae). 



PEREOPODS 3-5 



Relative lengths : pereopod 3 { %);4=100%;5 = ( %). 

 General stucture: 



All similar in structure and slightly longer successively (normal) . 



Article 2 expanded: pereopod 3( ),4( ),5( ). 



Expanded lobe of article 2 of pereopod 5 different from pereopods 3 and 4- 



Chelate, subchelate, or prehensile: pereopods 3, 4, 5. 



Fossorial setation (see glossary) present, absent. 



Article 7 absent (Haustoriidae, Stegocephalidae) : pereopds 3, 4, 5. 



Pereopod 5 reduced to fewer than 6 articles. 



PLEOPODS 



(Rarely significant in marine Gammaridea [but see Phliantidae especially]). 



Relative length (size) of each pair: 1=- 100% ; 2= ( %) ; 3= ( %). 



Length of longest ramus relative to peduncle ( %). 



Length of inner ramus to outer ( %) (note absence of rami or low number 



of articles). 

 Shape of coupling hooks on peduncles. 

 Lobation of peduncles. 



UROPODS 1 and 2 



Absence (rare) or presence. 



Proj ection along following uropods. 



Uropod 1 reaching ( %) along uropod 2; ( %) along uropod 3. 



Uropod 2 reaching ( %) along uropod 3. 

 Relative length of rami: outer or inner shortened (occasional), inner absent or 



vestigial (rare). 

 Spination density of peduncle and rami (usually of specific value only). 

 Incision of inner ramus (example Anonyx). 



UROPOD 3 



Absence (rare) or presence. 

 Rami absent (rare). 



Length relative to other uropods; extension beyond longest of other uropods ( % of 

 its own length) . 



