New Zealand Half Crab

Petrolisthes elongatus

The New Zealand Half Crab, belonging to the family Porcellanidae, is a benthic crustacean found primarily in the Eastern Indian Ocean. It is commonly recorded at various dive sites, making it a familiar sight for divers exploring these waters. This species is typically found in shallow waters, with all recorded occurrences at depths shallower than 40 meters and most within 10 meters. This preference for shallow habitats makes it accessible to divers and snorkelers alike. These crabs are often mistaken for true crabs but can be differentiated by their elongated bodies and the way they tuck their legs under their bodies. However, like many benthic crustaceans, they are likely to be scavengers, feeding on organic matter and small invertebrates found in their habitat. The conservation status of this species has not been evaluated by the IUCN.