[2] It is currently unknown whether T. oceanicus was introduced to Hawaii in 1877 by area trade ships,[3] or 1500 years ago with the original Polynesian settlers.

[2] Microsatellite comparisons support the idea that the Hawaiian T. oceanicus colonization originated in the Western islands and then spread East.

The two species are nearly morphologically indistinguishable, the exception being that T. oceanicus males have a greater number of file teeth on their wings.

[1] T. oceanicus was originally regarded taxonomically as a geographic race of T. commodus, but was later recognized as a distinct species as growing evidence of reproductive isolation and differences in calling sound were reported.

[4] The two species' geographic ranges remain mostly separate with the exception of small overlap zones in Eastern Australia.

[1] There have been no reports of hybridization between the species in this overlap zone, thought to be due to differences in calling song acting as a pre-zygotic barrier.

[1] Unlike T. commodus which lays eggs only a single time per season, T. oceanicus crickets breed year round.

[1] Like most cricket species, Teleogryllus oceanicus males produce a calling song to attract potential female mates.

The male will then flatten his abdomen and spread his forewings, allowing the female to mount him, ultimately leading to copulation.

In crickets, male guarding behavior duration is closely related to the time it takes to complete sperm transfer.

[12] Because the long chirp element is more energetically demanding, this preference may serve as an honest indicator to the female in regards to the male's fitness.

In other words, crickets can sense how closely related an adjacent individual is by processing the odor exhibited by the CHCs.

Females have been shown to exhibit a preference for CHC profiles that show a higher degree of dissimilarity, suggesting that it could serve as a defense against inbreeding.

[13] Because conflicts can be very costly, winning fights may serve as an honest indicator of a male individual's fitness which can be assessed by females.

[22] Rather than focus on ejaculate quality, subordinate males up-regulate the production of their cuticular hydrocarbons to appear more attractive to females.

While this behavior is vital for mate attraction, it also gives up the calling individual's locations to nearby predators, especially those which hunt using acoustic cues.

For some T. oceanicus populations in Hawaii, the parasitoid fly species Ormia ochracea also poses a great threat.

[25][26] Teleogryllus oceanicus crickets have been shown to be able to distinguish a range of echolocation frequencies, responding with avoidance flight away from the bats.

[26] Multiple species of bats (Nyctophilus major and N. geoffroyi) have been shown to prefer trills in the cricket song compared to chirps.

[30] Infected male individuals spend less energy on spermatophore production and calling, and allocate less mass to reproductive tissue.

Whether the decrease in reproductive effort is a result of energy trade-offs or chemical changes made by the fly to affect the host remains to be seen.

[30] In 2003, a novel mutation was identified in the highly parasitized Teleogryllus oceanicus population in Kauai that resulted in a wing morphology that renders the male obligately silent (known as flatwing).

To overcome this barrier and pass on the mutation to future generations, a behavioral change in regards to reproduction would have had to take place to compensate.

Although they are superficially similar, silent flatwing morphs observed in populations on three different Hawaiian islands have been shown to be the result of separate mutational events which occurred in the same or nearby genomic regions.