MARINE AMPHIPODA IN MICRONESIA — BARNARD 



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gorized these separately. More species are now known from Indonesia 

 to Hawaii than from the Red Sea to Indonesia, indicating that ex- 

 ploratory efforts in the past few decades have been concentrated in 

 the Pacific rather than in the Indian Ocean as they were in earlier 

 decades. No doubt a large share of those species now restricted to 

 one side of Indonesia will turn up on the other side. Considerable 

 exploration is warranted. 



Including the present research, 65 species of amphipods are now 

 known from Micronesia, of which 23 are technically endemic, 13 of 

 these being described as new in this paper. All but 7 of the 65 species 

 are considered to be algal or epifaunal dwellers. Thus, of 139 expected 

 Indo-Pacific species (less those of the Red Sea) , 58 have been collected 

 in Micronesia. A better way to express the situation is to remove the 

 endemic species from both figures so that, of 116 previously described 

 species, only 35 have so far been collected in Micronesia. 



Apparently, with the work of Schellenberg (1938a) and the present 

 effort, the Micronesian amphipod fauna is better known than that of 

 any other Indo-Pacific area, since more of the expected 150 epifaunal, 

 possibly ubiquitous species (those with asterisks in table 1), have 

 been collected in Micronesia. The number of epifaunal amphipod 

 species reported from each Indo-Pacific region, with an expected 

 total of 150, shows the following distribution: Red Sea, 41; E. Africa, 

 36; India, 52; Indonesia, 34; Micronesia, 58; Polynesia, 33; Hawaii, 

 23. 



Table 1. — List of Indo-Pacific tropical gammaridean Amphipoda frotn the literature 

 (*= Known epifaunal interticlal species; all others are subtidal, benthic, or of 

 unknown ecology; species in parentheses are dubious. See J. L. Barnard, 

 1958, for references) 



