[4][5] Along with the other species within the genus Perisesarma, the red-claw mangrove crab has a relatively square-shaped carapace and a “tooth” protruding off the sides of it.

[11] Despite increases in pollution from sewage in these areas, the crabs tolerate and are even capable of using the excess nutrients, making them less helpful in measuring mangrove health.

P. guttatum are mainly herbivorous, eating dead plant material and other organic matter foraged from the estuarine or forest floor during low tides.

[3] During the early stages of life, planktonic larvae move offshore and are distributed with the help of ocean currents.

[13] They later return as megalopa larvae – the step in their development that comes after 5 planktonic life stages – and settle in the nearshore environments around where they were once born.