GOPALAKRISHNAN: ZOOGEOGRAPHY OF NEMATOSCELIS 



70* 80' 



90* |00- 110^ 120* !»• M<r IW 



APRIL 16 - OCTOBER 15 

 (NIGHT STATIONS) 



Number of ADULTS per ca. 200 m' 



Nematoscelis atlantica 



• 1-9 



• 10-19 



Figure 10. — Locality records and nighttime abundance of Nematoscelis atlantica adults in the Indian Ocean: b - SW Monsoon period. 



Pacific Ocean 



North and South Pacific populations of N. mi- 

 crops are in communication with each other across 

 the western equatorial Pacific (Figure lib). This 

 species is absent along the eastern boundary cur- 

 rents (California Current and Peru Current) and 

 also from the poorly oxygenated subsurface wa- 

 ters of the eastern tropical Pacific. Nematoscelis 

 microps was also caught less frequently in the 

 eastern North Pacific central water mass than in 

 the western North Pacific central water mass. In 

 the equatorial region this species is known to 

 occur only west of long. 110°W (Brinton, 1962). It 

 is also recorded from the China Sea and the re- 

 gions of the Timor, Molucca, and Banda seas. The 

 populations of the Indian and Pacific oceans are 



probably in communication with each other 

 through the straits of Timor, Banda, Molucca, and 

 Halmahera. 



Geographical Distribution of N. lobata 



Hansen (1916) described A'^. lobata from the 

 Philippines. He found it at only two localities: lat. 

 13°43'N, long. 121°E and lat. 7°07'N, long. 

 125°40'E. Nematoscelis lobata appears to be en- 

 demic to the semi-isolated seas around the west- 

 ern side of the Philippines. In the present survey it 

 was caught mostly from the Sulu Sea area (Naga 

 Expedition) (Figure 15). At station SllB-205, five 

 mature males and six females were caught in a 

 2-m-net collection, 0-500 m (lat. 6°35'N, long. 



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