FISHERY BULLETIN: VOL. 72, NO. 1 



Pacific niorii approached the Americas in the 

 vicinity of Baja California and also at the 

 latitudes of the Gulf of Guayaquil. 



Among the 72 quantitatively analyzed sam- 

 ples containing niorii estimates of abundance 

 ranged from 0.003 to 0.5 individuals per m-*, 

 the median being 0.01. In the sets of samples 

 selected for quantitative analysis (Figure lb) 

 mean abundance in the Indian Ocean exceeded 

 0.04 individuals per m'*, 5 or more times higher 

 than that found in sets of samples from the 

 Pacific Ocean (Figure 35, Table 14); frequency 

 of occurrence in the Indian Ocean (~30%) was 

 also higher than in the Pacific Ocean (^20%). 



PONTELLINA SOBRINA SP.N. 



(Figures 13 and 14) 



Specimens seen: 421 adult females, 364 adult 

 males. 



Standard measurements: specimens randomly 

 selected from locations spanning the 

 observed geographical distribution. 



Total length (TL). mm: 



Prosome-urosome length ratio (PUR): 



Diagnosis 



Female 



Most similar in appearance to morii. Spini- 

 form process strongly demarcated from ThlV- 

 V corner and typically symmetrical as in morii, 

 but spine almost twice as long (Figure 10, 

 Table 2); in dorsal view weakly curved spines 

 extending posterolaterad (Figure 13g). Genital 

 segment with two lateral clusters of hairs on 

 both sides, anterior cluster consisting of fine 

 hairs, posterior cluster consisting of coarse 

 hairs (Figure 13 a, g); posterior margin of seg- 

 ment with border of long fine hairs as in all 

 preceding species. 



Male 



ThIV-V (Figure 14a. b) as in female. P5 

 (Figure 14c, d) most similar to that in morii 

 with notable differences present in chela. 

 Distal segment of chela relatively long, apex 

 extending beyond apex of laterodistal digitiform 

 process of proximal segment. Moreover, distal 

 segment lacking subapical spur (Figure 14c, d); 

 in lateral view posterior basal process and digiti- 

 form process of i)roximal segment separated 

 by rounded notch (Figure 14d); proximal 

 segment in posterior view as in morii. Left 

 P5 with Rel longer than that in plumata (see 

 Figure 30). 



Additional Description 



Female 



Right furcal ramus somewhat shorter relative 

 to its width as well as to length of prosome (see 

 Figures 25, 27), median ratio of right furcal 

 ramus length to width 1.12:1, range 1.02-1.31:1, 

 66 specimens; lateral edge of right ramus usual- 

 ly with broad point immediately anterior to 

 base of outermost seta (Figure 13h), glandular 

 tissue within ramus as in plumata. 



P5 (Figure 13i) similar to that in morii except 

 that ratio of lengths of exopod to endopod tends 

 to be smaller, median 1.29:1, range 1.07-1.50:1. 

 52 specimens (see Figure 29); Ri typically with 

 two relatively equal apical spines (see Table 7). 



Attached spermatophore observed in 27 speci- 

 mens (see Table 5), not differing appreciably in 

 general features from those observed in morii. 



Male 



Right furcal ramus similar to that in morii 

 in both relative length (see Figure 26) and in 

 proportion of length to width, median 1.88:1. 

 range 1.71-2.07: 1, 40 specimens (see Figure 28); 

 Rel of left P5, compared to length of right furcal 

 ramus, relatively longer than that in morii (see 

 Figure 30), this ratio in .'«)briiia ranging from 

 0.96-1.17:1,21 specimens. 



Etymology 



The name sobri)ia, Latin for cousin, was chosen 

 to acknowledge the close morphological relation- 

 ship to Diorii. 



84 



