FLEMINGER and HULSEMANN: FOUR SIBLING SPECIES OF PONTELLINA 



Table 8. — Dimensions of selected segments of sexually modified appendages of 



Pontt'lliiui spp. adult males. 



Length of Left First Exopodal Segment 



This segment is much shorter in plumata 

 than in the other three species (Figure 30, 

 Table 8). Small differences appear among the 

 three equatorial species but they are inconspic- 

 uous in comparison to their distribution as a 

 group relative to that of phi niata. 



Width of Right First Exopodal Segment 



As in the section above on the left, Rel, the 



.20 r 



E 



en 





o 

 cc 



: I! 



16 



O ,14 



O 



X 



o 



 

   t 



  ^U-2 



♦-2 



D 



2-D D n-2 D 



£-♦   f^f  * 2-0 D'^n a 



. . .,3 .,3  



3-4    n-2 n D 



  



a 



• • 



• % 



2s^ 

 A ^ • ^-4 



2-« • 



 plumata 



• morii 



A sobrina 

 D platycliela 



A A-2 '^ A-3 

 A A A-2 A 



_L 



_L 



_J_ 



.14 16 18 .20 



WIDTH OF RIGHT P5 Rel, mm 



22 



Figure 31. — Length of right furcal ramus (ordinate) plot- 

 ted against width of right P5 Rel (abscissa) for males of 

 the four species of Poniellinu. 



distributions of the three equatorial species 

 broadly overlap, but plumata tends to be ap- 

 preciably smaller (Figure 31, Table 8). 



Morphology of Right First Exopodal Segment 



The proximal segment of the chela appears 

 in three essential states: the swollen condition 

 of platycliela (Figure 7a, b), the slender condi- 

 tion of plumata (Figure 4i, j) and the slender 

 condition characterized by a more distal position 

 of the posterolateral outgrowth shared by morii 

 and sobrina (Figures lid, e; 14c, d). 



Morphology of Right Second and Third 

 Exopodal Segments 



The distal segment of the chela appears in 

 three states: the swollen condition of plalychela 

 (Figure 7b), the shortened, spurred condition of 

 morii (Figure lid, f) and the simple attenuated 

 condition shared by plumata and sobrina (Fig- 

 ures 4j, 14d). 



Length of Segment 18, Right First Antenna 



Two siblings, plumata and plalychela, broadly 

 overlap and occupy the upper half of the overall 

 distribution; the other two, morii and sobrina, 

 broadly overlap in the lower half of the distri- 

 bution (Figure 32, Table- 8). 



Spermatophore Attachment 



(Figures 33, 34) 



The three equatorial species agree in having 



99 



