The fiddler crab influences the structure and biology of the sediment through foraging and by constructing burrows for defense.

In a study by Bezzarra and authors, the relationship between size of the crab carapace and fecundity, amount of offspring produced at a potential mating season.

[12][13] Globally, Leptuca thayeri, is distributed in the Western Atlantic around the subtropical mangroves in Ubatuba, State of São Paulo, and Brazil.

[1] This mangrove fiddler crab is also reliant on the substrate quality, such as: pebble/sand/silt/clay balance, organic matter availability, and the abundance of seagrass.

[14] In the eyes of mangrove fiddlers, exist a simple system used to detect light and even decipher between different colors.