Pteropus pelagicus no relation Ancient Greek πελαγικός
Pteropus pelagicus is a species of fruit bat in the family Pteropodidae. It includes two subspecies that were formerly recognized as full species— Pteropus insularis (Chuuk flying fox) and Pteropus phaeocephalus (Mortlock flying fox). It is endemic to Micronesia.  It is threatened by habitat loss.Etymology and taxonomy
The species was described by German naturalist Heinrich von Kittlitz in 1836. 
He gave it the species name pelagicus from Ancient Greek  πελαγικός 'of the open sea'.In 2013, a study was published that challenged the status of the Chuuk flying fox and the Mortlock flying fox as species.
The study stated that the Chuuk flying fox was not significantly different from the Mortlock flying fox, and that they represent two subspecies of the same species, which should be called Pteropus pelagicus. They proposed that the Chuuk flying fox be referred to as P. p. insularis, and the Mortlock flying fox be referred to as P. p. pelagicus. The study also concluded that the closest relative of P. pelagicus is the Guam flying fox, based on morphology.
A 2014 study that used genetics also concluded that the Guam flying fox was the sister taxon to P. pelagicus.
There are currently two recognized subspecies of Pteropus pelagicus, both of which were formerly recognized as distinct species.
no relation