FLEMINGER and HULSEMANN: FOUR SIBLING SPECIES OF PONTELLINA 



abrupt in both dorsal and lateral views (Fig- 

 ure 9a-f), right and left sides symmetrical 

 (Table 2), spine small, not exceeding 0.035 mm 

 irrespective of TL (Figure 10), spine roughly 

 one-half as long as that in its congener from the 

 eastern equatorial Pacific described below. 

 Genital segment with posterolateral cluster 

 of coarse hairs on both sides, lacking antero- 

 lateral cluster found in pin mata although several 

 fine hairs may occur at this site (Figure 9a, e): 

 posterior margin of segment bordered by fine, 

 long hairs as in plumata. 



Male 



ThIV-V typically ending posteriorly in a 

 small spiniform process (Figure lib, c) similar 

 to female. P5 with chela of plumata-type but 

 both segments showing distinctive features; 

 distal segment short, not reaching opposing 

 disto-lateral digitiform process on proximal 

 segment (Figure lid), apex of distal segment 

 with prominent triangular spur on posterior 

 side (Figure lld-f); proximal segment in lateral 

 view with basal process posterior to digiti- 

 form process acuminate, intersection of 

 posterior basal process and digitiform process 

 usually in form of a deep angular notch; in 

 posterior view proximal segment with axis 

 of posterior basal process extending somewhat 

 parallel to digitiform process and not overlap- 

 ping anterior basal process, latter angled to- 

 ward articulation between proximal and distal 

 segments. Left P5 with Rel longer than that in 

 plumata (see Figure 30). 



Additional Description 



Female 



Right furcal ramus considerably shorter 

 than in plumata relative to prosome (see Figui'e 

 25), right furcal ramus with median ratio of 



1.5 



1.4 - 



E 1,3 



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sobrina 

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LENGTH OF Th E-I SPINE, mm 



.06 



Figure 10. — Length of prosome (ordinate) plotted 

 against length of ThIV-V spine (abscissa) for females of 

 PonteUina morii and P. sobrina. 



length to width 1.25:1, range 1.12-1.44:1, 46 

 specimens; lateral edge of right ramus with 

 small point variable in shape just anterior to 

 base of outermost seta (Figure 9e, h), glandular 

 tissue within ramus as in plumata. 



P5 with Re bearing hairs along median mar- 

 gin (Figure 9g); Ri relatively longer than that 



Table 2. — Length of posterior spine on thoracic segment IV-V in adult females of 



Poiiicllina iiiorii and P. sobrina. 



81 



