FLEMINGER: INTEGUMENTAL ORGANS IN GENUS EUCALANUS 



Figure 1. — Genus Eianhinus. Genital segment, lateral 

 view, female — a. Mihwiiiiis (Downwind 28); b. Dincroiniiiis 

 (Monsoon 11); c. cniwus (Alusku 4-36); d. loiii>ucp.'< 

 (Monsoon 24); c. itiDiuuhits (Alaska 5-7); g. pilcaiii\ 

 (Lusiad VII Freetown); i. \iil>cra.\siis (Lusiad II H-1); 

 k. iU'iuauis (Naga SUA 61-198); I. clonKaius (Naga SUA 

 61-127); ni. hyaliims (TRANSPAC 10 B); n. incnnis (Mud- 

 dauber 137-1); o. hiiiiiiii (TRANSPAC 65 B); p. calijoniiciis 

 (5606 50.80); q. aiiciuiuiti', (EASTROPAC A 207); r. 

 scwclli (Aihnuis 11-31-119); s. parki (Boreas 19); t. lansiuc 

 (Monsson 24). Anterior portion of head, lateral view, 

 female — f. pilcuius (Lusiad VII Freetown); h. suhcrassus 

 (Lusiad II H-1): j. dcniaius (Naga 61-198). The shaded 

 areas indicate the extent of sperm in the seminal recep- 

 tacle. Positions for stations mentioned are listed in 

 Snyder and Fleminger ( 1965, 1972). 



groups within the genus and concurred with the 

 evidence derived from study of the seminal 

 receptacles. Greater appreciation of the repro- 

 ductively isolated populations within EucoIcdiks 

 (Table 1) also revealed the compelling need for 

 much additional work on finer details to com- 

 plete a satisfactory account of each species. The 

 four geographical forms of attejiiiatus s.l. 

 require comparative study of conventional mor- 



phological features in both sexes. Their geo- 

 graphical distributions should be amplified by 

 reexamination of the great number of records 

 and sorted specimens now in hand recorded col- 

 lectively under attenuatuH s.l. 



Evidence of geographical variation in suh- 

 fcinds, described below, requires additional 

 study and should be examined in the context of 

 co-occurrence with its sibling congener, niiicro- 

 initus. Also, closer geographical scrutiny should 

 be made of other widely ranging species show- 

 ing broadly neritic habitat preferences such as 

 cj-assus and pihatus. 



Realization that the significance of integu- 

 mental organs in copepods overshadows and 

 holds more widespread interest than the genus 

 Encalaiius is the basis for presenting the sur- 

 vey of sensilla and pores within the framework 

 of an incomplete taxonomic review. Completing 

 the global account of Eucalanus first would im- 

 pose a long and unnecessary delay. Based on 

 seminal receptacles, geography, and integumen- 

 tal organs, the essential diversity within the 

 genus is now unmistakably clear. Details still 



Table 1. — Author's provisional list of valid species and phylogenetic groupings comprising the 

 genus Eiicakiiuis. Summarized distribution and biogeographic assignment based on records confirmed 

 bv author. 



subtenuis group; 



1. E. siihienuis Giesbrecht, 1888. Broadly Tropical, circumglobal ' in eufrophic oceanic waters; epiplankfonic. 



Figure 9e. 



2. E. niiicroiuiliis Giesbrecht, 1888. Tropical, Indian Ocean to western Pacific in equatorial circulation systems^; 



epiplanktonic. Figure 9d. 



3. E. c7i/AM(v Giesbrecht, 1888. Tropical-subtropical, circumglobal in eutrophic broadly neritic waters; epiplank- 



tonic. Figure 9a. 



4. E. l(ini,'icep\ Matthews, 1925. Boreal-temperate, circumglobal. Southern Hemisphere West Wind Drift system 



(= Southern Ocean Transition zone); epiplanktonic? Figure 9b. 



5. E. moiuuhiis Giesbrecht, 1888. Tropical -subtropical, Atlantic, broadly neritic; subsurface epiplanktonic. Figure 



9c. 



pileatus group: 



6. E. pilealiis Giesbrecht, 1888. Tropical-subtropical, circumglobal, coastal- neritic; epiplanktonic. Figure llo. 



7. E. siihcrassus Giesbrecht, 1888. tropical, Indo-Pacific, broadly neritic; epiplanktonic. Figure lie. 



8. E. deniutus Scott, 1909. Tropical, Austral -Asian seas; coastal epiplanktonic. Figure 1 lb. 



elongatus group: 



9. E. eloimiiliis (Dana, 1849). Tropical, Indian Ocean to western Pacific in equatorial circulations; epiplanktonic? 



Figure 13b. 



10. E. hyalinus (Clous, 1866). Tropical-subtropical, circumglobal especially in eutrophic, oxygenated waters adja- 



cent to boundary currents; deep epiplankton to upper mesoplankton. Figure 13c. 



11. E. iiternii', Giesbrecht, 1892. Eastern Tropical Pacific in eutrophic, low oxygen water; deep epiplankton to 



upper mesoplankton. Figure 13a. 



12. E. biint>ii Giesbrecht, 1892. Boreal-subpolar, North Pacific, and Bering Sea; epiplanktonic to upper mesoplanktonic. 

 13 E. califoniicus Johnson, 1938. Temperate, North Pacific, West Wind Drift system (= North Pacific Transition 



zone); deep epiplanktonic to upper mesoplanktonic. Figure 13d. 



attenuatus group: 



14. altenuulus (Dana, 1849). Tropical, Indo-Pacific equatorial circulation systems; epiplanktonic. Figure 15d. 



15. sewelli sp.n. Tropical-subtropical, circumglobal; epiplanktonic. Figure 15c. 



16. parki sp.n. Temperate, North Pacific, West Wind Drift system ( = North Pacific Transition zone); deep epi- 



planktonic to upper mesoplanktonic. Figure 15a. 



17. lanfuw sp.n. Temperate, circumglobal. Southern Ocean West Wind Drift system ( = Southern Ocean Transition 



zone); deep epiplanktonic and upper mesoplanktonic. Figure 15b. 



' Evidence of three regionalized populations: Eastern Tropical Pacific; Tropical Indian Ocean to western 

 Tropical Pacific; Tropical Atlantic. 



■-' Two questionable records from Tropical Atlantic: Florida Current (Owre and Foyo, 1967) and Gulf of 

 Mexico (Fleminger, unpublished data) . Forehead pointed but basal segment of mandible with two setae. 



969 



