Summary

The Pacific Toothed Oyster, Isognomon isognomon is a poorly studied pterioid in the past. However, in recent times, there has been a rapid increase of researches done in the understanding of this bivalve; due to its efficiency as a biomonitor. Unfortunately, despite this increase of studies and focus placed on this species, there was still a lack of studies done on the physiology and ecology of this species.

I.isognomon have inconsistent and irregular shapes due to its habituation in space-limited areas. Nevertheless, the inconsistency of shell shapes is similar throughout its genus Isognomon; with only a few small distinctive morphological characters used to differentiate species belonging to this genus. This species is also relatively young as compared to other bivalves; with its naming and taxonomy only being found in 1988 by Crampton. There is still lack of reproduction and ontogeny studies on this species, making it extremely difficult to fully understand this species of bivalve. I. isognomon also showed its ability to persist in a wide variety of regions, ranging from temperate to tropical. Its distribution has now been shown to be larger than what was previously thought; occurring only in northern Australia and the Indo-Pacific region.