PHYLOGENY OF ARIETELLID COPEPODS 



157 



XXII 



Fig. 36. Sarsarietellus abyssalis, female (holotype). A, Antennulary segments XXI to XXVIII; B, Terminal part of second endopod segment 

 of antenna, vestigial innermost seta indicated by arrowhead; C, Antennary exopod; D, Mandibular endopod and exopod; E, Praecoxal 

 arthrite, coxal endite, basis and endopod of maxillule, vestigial basal seta indicated by arrowhead; F, First praecoxal endite of maxilla; G, 

 Basal spine of maxilla; H, Leg 5, posterior surface. Scales in mm. 



wider than long; entire reproductive system paired, sym- 

 metrical; large circular gonopore and small copulatory pore 

 located at outer and inner ends of slit-like aperture, respec- 

 tively; copulatory duct short, simple; seminal receptacle 

 relatively small, located medial to gonopore. Caudal rami 

 slightly asymmetrical, with right ramus narrower and just 

 shorter than left, with setae II and III relatively long. 



Antennules asymmetrical, left longer than right and reach- 



ing to end of caudal rami; antennules 21-segmented on both 

 sides; posterior proximal margin lacking long setules; seg- 

 ments I to IV fused, segments IX to XII partially fused; 

 segments XXIV to XXVIII fused into compound apical 

 segment. Antenna: first endopod segment with 1 mid-margin 

 inner seta, second with 3 setae at midlength and 5 setae 

 terminally; exopod indistinctly 7-segmented. Mandibular 

 gnathobase lacking tuft of setules; 4 teeth on cutting edge, 



