
New zealand half crab
A species of Petrolisthes, Also known as Blue half crab, Half crab Scientific name : Petrolisthes elongatus Genus : Petrolisthes
New zealand half crab, A species of Petrolisthes
Also known as:
Blue half crab, Half crab
Botanical name: Petrolisthes elongatus
Genus: Petrolisthes
Content
Description


Description

The carapace is flattened with smooth side and rear margins, width is up to 18 mm (0.71 in), and long whip-like antennae grow from the front corners, with the short rostrum extending beyond the large prominent eyes. The animal either filter feeds with long setae borne from the maxilliped palps, or scavenges by chopping up flesh with the second maxilliped and further shredding with the mandibles. The large chelipeds are generally smooth with no teeth or serrations, mainly used for territorial defense among males, who usually have one enlarged. Chelipeds and legs bear randomly located spines which can break off with wear, and these areas are dorsally coloured the same as the carapace, in black, blue, greenish or greyish, the ventral areas lighter. The last pair of legs are setose, reduced in size and carried folded under a large abdominal flap, which also allows the animal to swim backwards. Telson and uropods also setose. Studies in New Zealand from the 1960s and 1970s showed a difference in breeding biology from north to south, with ovigerous females found all year round in Auckland, and only in the summer months around Kaikoura. Females are assumed to brood two or three times during their lifespan, producing 500 - 1000 eggs.
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Scientific Classification

Phylum
Arthropods Class
Malacostracans Order
Crabs Family
Porcelain crabs Genus
Petrolisthes Species
New zealand half crab