FLEMINGER and HULSEMANN: FOUR SIBLING SPECIES OF PONTELLINA 



20° 0° 20° 



■?0° -.... ...;..., ,., 60° lOO" 140° 180° 140° 100° 60° 20° 0° 



Figure 15. — Pontellina sobrina sp.n. Geographical distribution of captures recorded during the present study. 



20° 



notes and Table 3 summarize ontogenetic 

 characteristics of stages II through V prevailing 

 in the genus. 



Stage II 



TL 0.72-0.76 mm (5 specimens). Rostral fila- 

 ments and dorsal ocelli-like structures present; 

 prosome with 4 free segments, urosome with 

 2 segments. Re of PI and P2 bimerous, Ri of 

 PI and P2 and both rami of P3 unimerous, P4 

 consisting of a pad with folds, short setae and 

 an incipient Ri; P5 lacking. 



Stage III 



(Figure l6c) 



TL 0.82-0.88 mm (20 specimens). Neither 

 sexes nor species distinguishable. Prosome with 



5 segments, urosome with 2 segments. Re of 

 P3 bimerous, Ri of P3 as well as both rami of 

 P4 unimerous. P5 lobiform, bearing one apical 

 seta. 



Stage IV Female 



(Figure l6a) 



TL 0.90-1.10 mm (22 specimens, probably 

 including all four species). Urosome with 3 

 segments. Re of P3 and P4 bimerous, Ri uni- 

 merous. Re of Po unimerous; right Re and elon- 

 gate seta on mediodistal corner of Re slightly 

 larger than those of left P5; Ri lobiform, in- 

 completely separated from B2. 



Stage IV Male 



(Figure l6b) 



TL 0.95-1.10 mm (22 specimens, probably 

 including all four species). Male resembles 



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