Four new species of crab have been discovered in the Philippine island of Palawan. And one of the crabs truly stands out with its unusually bright purple shell.
National Geographic reports that the Insulamon palawanese may use its uniquely colored shell to help identify its own kind.
"It is known that crabs can discriminate colours. Therefore, it seems likely that the colouration has a signal function for the social behaviour, e.g. mating," Hendrik Freitag of the Senckenberg Museum of Zoology in Dresden, Germany told AFP.
"The particular violet coloration might just have evolved by chance, and must not necessarily have a very specific function or reason aside from being a general visual signal for recognition," Freitag told National Geographic. Freitag's report on the new species of crabs was published in the Raffles Bulletin of Zoology.
I doubt many people will want to bother eating them because, "...the newly discovered crabs are quite small in stature, each from about an inch to two inches wide."
I gather from the article they are more of a land crab. I'm in WA state and when I think of crabs I think of the beach or ocean but the article says, "the greatest threat to the species is ongoing forest clearing for farming, mining and home building." which implies their main habitat is on land.