FLEMINGER and HULSEMANN: FOUR SIBLING SPECIES OF PONTELLINA 



0.2 mm 

 a-h 



0.2mm 



I - 



d 



Figure 17. — Copepodite stage V, females: a-d. ThIV-V, right P5 and urosome, lateral view; e-h. anal segment,. furcal 

 rami, dorsal view; i-1. P5, anterior view. Poniellina pliiinaia: a, e {Atlantis //-31-1); i (Lusiad V-60). P. platychela: 

 b, f,j (Atlantis //-20-42). P. niorii: c, g, k (Dodo VI, near Mombasa Harbor). P. sobrina: d, h, I [TO-58-1 (Scot) 56] . 



calanidae, Pseud ocalanidae, Aetideidae, 

 Euchaetidae. Phaennidae, Scolecithricidae) but 

 not in Eucalanidae (Johnson, 1937; Sewell. 

 1929; Bjornberg, 1967; and our unpublished 

 observations of all species) fusion of urosomal 

 segments I and II seems to be delayed until the 

 appearance of the sexually mature female. This 

 pattern has been documented by a number of 

 ontogenetic studies on individual species (With, 

 1915; Nicholls. 1934; Campbell, 1934; Marshall 

 and Orr, 1955; Matthews, 1964; and our un- 

 published observations). 



Notes on Individual Species 



PoiitelliiiJ pliiiiiata 



(Figures 17a, e, i; 18a, e, i, m, p) 



Copepodite stage V female: TL x 1.38 mm. 

 range 1.26-1.48 mm, 10 specimens. Postero- 

 lateral corner of ThV (Figure 17a) produced 

 into a strong point similar to the adult. Furcal 

 rami symmetrical (Figures 17e, 19), length of 

 right ramus relative to width greater than that 

 in morii (Figure 20). P5 Ri shorter than in niorii 



89 



