FISHERY BULLETIN: VOL. 71, NO. 4 



were insufficient to provide an indication of 

 biogeographical affinities. It is a great pleasure 

 to name this species for TaiSoo Park in recog- 

 nition of his acumen and farsightedness in 

 judging copepod systematics. 



Eucalauus Ltrigae, n. sp. 

 (Figures It, 15b, 18h, p) 



E. attenuatus: Bradford 1970, p. 353, Figs. 6-9. 



Diag)iosis: Adult female: Closely resembling 

 parki in size and appearance including the 

 occurrence of four setae on the mandibular 

 basis. Integumental organs as in parki except for 

 significant increase in abdomen (Figure 15b). 

 Genital segment and Abd.III each with two ter- 

 gal sites. Anal segment (Abd.IV-V) with two 

 transverse rows of tergal sites as well as more 

 regularly occupied pleural sites occurring in 

 copepodid stage V and in adults (Figure 19, 

 Table 5), the mean total number being about 

 twice that of parki. 



8 10 12 



>> 



a 



0) 

 3 

 » 



lOr— 



5 — 



4 6 8 



Perforations 



10 



12 



Figure 19. — Frequency distribution of the total number of 

 perforations on the anal segment (Abd.IV-V) in stage V 

 female copepodids above and in adult females below. 

 Diagonal hashing represents Eucalanus parki, dotted area 

 represents £. langae. 



996 



Additional description: Adult male: Integu- 

 mental organs of cephalosome and thorax as in 

 female; Abd.II with two tergal sites as in geni- 

 tal segment of female. 



Total length: Adult female: range 6.44 to 

 7.22 mm, mean= 6.847 mm, .s =0.2235, A'= 14 

 (Figure 16). 



Adult male: 6.12 mm and 6.59 mm. Locali- 

 ties of specimens given in Table 1. 



Geographical distribution: Available records 

 (Figure 17) indicate that langae is a resident of 

 the circumglobal Transition zone in the Southern 

 Hemisphere. 



Types a)id type locality: Holotype: 9- USNM 



143839. Cruise Lusiad VII, stn 14, Isaacs-Kidd 

 midwater trawl; 0-3,400 m; 6 June 1963, 1530- 

 2300 h; 32°30'S, 9°04'E to 32°24'S, 8°25'E. 



Reference: 2 99, specimens no. 4 and 6. USNM 



143840. Cruise Monsoon, stn 18, Isaacs-Kidd 

 midwater trawl; 0-2,723 m; 11 Mar. 1961, 

 2046-0303 h; 25°52'S, 155°44'W to 25°40'S, 

 155°34'W. 



Remarks: Lang (1965) found specimens of 

 this species at several Monsoon and Downwind 

 stations (Figure 17) and noted their resemblance 

 to their North Pacific temperate cognate. Brad- 

 ford (1970) also noted this similarity in record- 

 ing it from off the Kaikoura Peninsula, New 

 Zealand, and referring to Tanaka's (1956) 

 mention of a large attoiuatus s.l. off Japan. 



Though data on designated sites are lacking 

 for Bradford's specimens, the probability that 

 they are referable to langae is sufficiently great 

 to include them under the species without re- 

 servation. 



Assignment of the sibling populations langae 

 and parki to separate species is based on two 

 lines of evidence: 1) significant differences in 

 designated sites involving abdominal segments 

 that undergo modification with sexual matura- 

 tion (Table 5, Figure 19); 2) apparent restric- 

 tion of each population to temperate zones in 

 opposite hemispheres (Figure 17). 



Although data on actual depth distribution 

 are unavailable for either species, most of the 



!l 



