Trypaea

Trypaea australiensis, known as the (marine) yabby or ghost nipper in Australia, or as the one-arm bandit due to their occasional abnormally large arm,^[1] and as the Australian ghost shrimp elsewhere,^[2] is a common species of mud shrimp in south-eastern Australia,^[2] and may be the only extant species in the genus Trypaea.^[3][4] T. australiensis is a popular bait used live or frozen by Australians targeting a range of species.^[5] It grows to a length of 6 centimetres (2.4 in) and lives in burrows in mudflats or sandbanks, especially in or near estuaries.^[6]

Trypaea australiensis
Trypaea australiensis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Decapoda
Suborder:	Pleocyemata
Family:	Callianassidae
Subfamily:	Callianassinae
Genus:	Trypaea Dana, 1852
Species:	T. australiensis
Binomial name
Trypaea australiensis Dana, 1852

Species

One extant and two extinct species belong to the genus Trypaea:^[7]

• Trypaea australiensis Dana, 1852 (Australian ghost shrimp) (Indo-West Pacific and Australia)
• † Trypaea inornata (Nagao & Huzioka, 1938)
• † Trypaea mizunamiensis Karasawa, 1993 (temperate Asia)