FLEMINGER and HULSEMANN: FOUR SIBLING SPECIES OF PONTELLINA 



platychela 



30 

 20 



S lOf 



3 



o 



UJ 



L^ 20 



10 







20 



10 



0.15 0.10 0.05 



<-)H 



005 0.10 015 020 

 + ) 



Figure 19. — Frequency distribution of differences in length 

 of left furcal ramus and right furcal ramus for the four 

 species of Poniellina. Gray with heavy outline = adult 

 females; left-diagonal hatch with light outline = adult 

 males; right-diagonal hatch with dotted outline = stage 

 V females. 



,09 



E 08 



E 



t- 

 Q 



07 



4 plumata 

 o morii 



  



O O O O O ♦-S 4-2 



o 3-4 4 3-4   



O 0-7 O f-2 f-3 ^ 



o o 



.13 14 .15 



LENGTH, mm 



16 



17 



Figure 20. — Width of right furca (ordinate) plotted against 

 length (abscissa) for female stage V copepodids of Pont el- 

 Una pi II mala and P. morii. 



relative to length of right furcal ramus (Figure 

 21). Re to Ri length ratio, median 3.0:1. range 

 2.3-3.5:1, 19 specimens (Figure 22); left P5 

 with medialmost seta on Re small and gently 

 curved (Figure 17i) relative to that in morii 

 (Figure 17k). 



Copepodite stage V male: TL x 1.30 mm, 

 range 1.20-1.44 mm, 10 specimens. Postero- 

 lateral corner of ThV ending in a broad point 

 (Figure 18a, p). Terminal segment of right P5 

 about 3.1 times longer than wide (Figure 18i), 

 endopod rarely pre.sent (Figure 18m). Furcal 

 rami (Figure 18e) similar in relative length 

 and width to those of female. 



07 



06 



I 05 



in 



0. 



04 



O 



I 



o 



UJ 03 



O 



O 



OO 

 O 2-0 O 



O O 

 O 0-2 



0-2 



O O O 



 plumata 

 o morii 



 



 2-^ 4 



 2-4  



2-4   



 



13 14 15 .16 



LENGTH OF RIGHT FURCAL RAMUS, mm 



.17 



Figure 21. — Length of P3 Ri (ordinate) plotted against 

 length of right furcal ramus (abscissa) for female stage V 

 copepodids of Poniellina plumaia and P. morii. 



go 

 o 



UJ 



q: 



plumata 



I — T 



-rn 



n-n 



I \ I I I L 



1.5 



111 



20 



2.5 



3.0 



Re 



P5-H^, St.S: Females 

 Ri 



Figure 22. — Frequency distribution of P5 Re:Ri ratio for 

 female stage V copepodids of Poniellina plumaia and P. 

 morii. 



91 



