FISHERY BULLETIN: VOL. 72. NO. 1 



20° ■-'•--'' ■■'• 60' 100° 140° 180° 140° 100° 60° 20° 0° 20° 



Figure 5. — Poniellina plitniaia s.str. Geographical distribution of captures recorded during the present study. 



6a-c, f-h); in dorsal view denticle not sharply 

 set off from tapering lateral margin of ThIV-V. 

 Genital segment (Figure 6f, g) with several 

 isolated lateral sensory hairs and line of slender 

 hairs along distal margin, lacking lateral clus- 

 ters of coarse hairs. 



Male 



Posterolateral corners of ThIV-V in lateral 

 view tending to be rounded and lacking denticle 

 (Figure 7c, d). Chela of P5 differing markedly 

 from that in pluniata due to strong antero- 

 posterior expansion of both segments (Figure 

 7a, b); distal segment spatulate: in proximal 

 segment base of laterodistal digitiform process 

 greatly expanded; in posterior view posterior 

 basal process barely differentiated but sensori- 

 iform seta present, anterior basal process rel- 

 atively small, and extending toward center of 

 lumen of chela. Left P5 (Figure 7a) with proxi- 



mal segment of Re (Rel) somewhat longer than 

 that in phonata, length of right furcal ramus 

 exceeds Rel by 1.3-1.5 times, 21 specimens 

 (see Figure 30). 



Etymology 



The name platychela is derived from the Greek 

 words platys ( = broad) and chela ( — crab's claw) 

 and refers to the relatively large chela of the 

 adult male. 



Types 



Holotype: Adult male, TL 1.52 mm, PUR 

 3.22:1; sorted from plankton sample taken at 

 Atlantis 77-31 stn. 48, lat. 00°56'N, long. 

 25°20'W, 12 Feb. 1967, %-m net, oblique tow, 

 maximum cable out 200 m. USNM No. 141613. 



AUotype: Adult female, TL 1.72 mm, PUR 



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