Petrolisthes elongatusis commonly referred to as Spiny Porcellain Crab,New Zealand half crab. Difficulty in the aquarium: There are no reports available yet that this animal has already been kept in captivity successfully. Toxicity: Toxic hazard unknown.
Petrolisthes elongatus is blueish grey in colour, with a flattened body.The New Zealand half crab can found under rocks in shallow water.This species is a filder feeder and sieve planctonic food and detritus from the water.
Porcellana elongata H. Milne Edwards, 1837