NO. 16 



MANTER : DISTRIBUTION OF DIGENETIC TREMATODES 



539 



Four genera and 8 species are involved here. In contrast to the wide 

 distribution of the genera in which amphi-American endemic species 

 occurred, all of these 4 genera are endemic amphi-American genera. Two 

 species of Theletrum occur in the tropical American Pacific and one 

 species at Tortugas. Opecoelina occurs in the Galapagos and at Tortugas 

 but also has one species known from the coast of the state of Washington. 



TABLE 4 

 Pacific Species Occurring Elsewhere but Not in the Atlantic 



Trematodes 



Hosts 



Distribution 



1. Opechona orientalis 



Angelichthys species 

 Paranthias furcifer 

 small mackerel 



Engraulis japonicus 

 Scomber japonicus 

 Sphcroides rubripes 



Mexico; Galapagos 

 Islands 



Japan ; Peter the 

 Great Bay 



2. Cymbephallus carangi 



Selar crumenophthalmus Ecuador 

 Caranx mertensi Japan 



3. Helicometra sinuata 



moray 



Ophidium imberbe 

 Trachinus draco 



Costa Rica 

 Mediterranean 



4. Opecoelus inimici 



Paralabrax nebulifer Mexico 



Inimicus japonicus Japan 



5. O peg aster 



parapristipomatis 



Selar crumenophthalmus 

 Trachinotus rhodopus 

 Parapristipoma 

 trilineatum 



Panama; 

 Galapagos Islands 



Japan 



6. Prosorhynchus acute atus 



Gymnothorax species 



Conger myriaster 

 Conoer vulgaris 



Galapagos Islands 



Japan; Mediterranean; 

 Belgium: Sweden 



7. Stephanostomum hispidum 



Elagatis bipinnulatus 

 Seriola dorsalis 

 Seriola species 

 Seriola quinqueradiata 



Mexico; Panama 



Japan 



This table shows a fairly distinct connection between the Japanese 

 trematode fauna (now well known) and the tropical American Pacific 

 fauna. The number of species, however, is half the number found else- 

 where only in the American Atlantic, although the Atlantic fauna is less 

 well known than the Japanese. Helicometra sinuata seems out of place 

 in its Mediterranean and Costa Rican distribution. Its identification 

 seemed correct but was based on a single specimen from Costa Rica. 



