Austruca mjoebergi
species of crustacean
Austruca mjoebergi, also known as the banana fiddler crab, is a species of fiddler crab that is found along the north and northwest coast of Australia (approximately from Dampier to the Gulf of Carpentaria) and parts of Indonesia.
Austruca mjoebergi exhibits extreme sexual dimorphism. The greatest difference between sexes is that the males have a large brightly colored major claw and a smaller minor claw, whereas females have two similarly sized claws. They are relatively small crabs with the males slightly larger than females. A census of a population of Austruca mjoebergi gave the average carapace width of adult males 10.4 ± 1.3 mm and adult females 8.8 ± 1.0 mm. Male major claw length is tightly correlated with carapace width. The same population had average major claw length of the adult males of 14.9 ±4.3 mm.
Competition and conflict
Male Austruca mjoebergi engage in conflict with other males at varying levels of aggression. At low levels of conflict, a male will use the back of his major claw to push another male's claw backwards. This may occur if a male encroaches on the border of another male's territory.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated May 30, 2026. The linked authority identifier is Q63724498. None of the 0 selected statements returned an explicit reference.
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