Minuca pugnax, commonly known as the Atlantic marsh fiddler crab, is a species of fiddler crab that lives on north-western shores of the Atlantic Ocean.
Heloecius cordiformis is a species of semiterrestrial crab found in mangrove swamps and mudflats along the east coast of Australia. Adults are around 25 mm (1 in) wide, with males being larger and having larger and more conspicuously coloured claws. The males wave their claws to communicate with other crabs, giving them their common name of semaphore crab. They can breathe both in air and under water, and feed at low tide on detritus in the sediment. H. cordiformis is the only species in the genus Heloecius and the family Heloeciidae.
Oregonia bifurca, commonly known as the split-nose crab or the split-nose decorator crab, is a species of crabs belonging to the family Oregoniidae. It is a rare deep-water species that inhabits the tops of seamounts and guyots in the northeastern Pacific Ocean; from the Aleutian Islands, the Bering Sea, the Hawaiian–Emperor seamount chain, to the waters off British Columbia. It is closely related to the more common shallow-water species Oregonia gracilis, the graceful decorator crab.
Ocypode brevicornis is a species of ghost crab native to the Indian Ocean, from the Gulf of Oman to the Nicobar Islands. They are relatively large ghost crabs with a somewhat trapezoidal body. The carapace reaches a length of 41 mm (1.6 in) and a width of 50 mm (2.0 in). They are a mottled brown to yellow in coloration. Like other ghost crabs, one of their claws is much larger than the other. Their eyestalks are large and elongated, tipped with prolongations at the tip known as styles. They are common inhabitants of open sandy beaches, living in burrows in the intertidal zone.
Gelasimus vomeris is a species of fiddler crab found in the southwest Pacific Ocean. In Australia, it is found in the east and north from Darwin to Sydney.
Helopgrapsus haswellianus, or Haswell’s shore crab, is the sole species of crab in the genus Helograpsus. It lives in river mouths and bays on the eastern coast of Australia. The carapace is strongly convex with one distinct notch behind the eye. Adult males have larger claws than adult females. The carapace is olive, dark slate grey or reddish. Claws of adult males are orange-yellow. Carapace size is up to 30 mm wide. The orange color is stronger when these crabs live in habitat with lower pollution levels.
Paragrapsus laevis is a species of crab found in south eastern Australia, from southern Queensland to around the South Australian border, including Tasmania.
Davusia glabra, commonly called the shiny bait crab, Sowrie crab or Sourie crab is the sole species of crab in the genus Davusia. It lives around the low tide area on rocky ocean shores on the eastern coast of Australia, in crevices and rock pools and on rock platforms. Its distribution is stated differently in different sources; some have described the crab's habitat as from Queensland to as far south as the NSW-Victorian border, while others have stated it can be found as far south as Wilson's Promontory. Its carapace is grey to fawn-colored with very small green spots, resulting in Davusia glabra having a greenish appearance. The width of the carapace is around 30-40 mm across and is smooth without hair, slightly wider than long, with 3 distinct spines at each edge.
Podophthalmus vigil is a species of swimmer crab found in tropical areas of the Indo-Pacific Ocean, including Hawaii, Japan, South Africa, the Red Sea, Australia. In Australia the crab is found across the north from Exmouth to Moreton Bay. It is commonly known as the Long-eyed swimmer crab Stalk-eyed swimmer crab, Red crab, or Periscope crab. Like other swimmer crabs the last pair of legs have flattened ends to form paddles. Colors include a greenish brown carapace with possible red spots, claws and legs pale violet, rose red or dark red. The carapace is typically up to 100mm across, very broad at the front, narrow at the back with a spine on each side. There is a single tooth behind the spine. Males are larger than females and have more elongated limbs.
Macrophthalmus setosus is a species of sentinel crab found on the east coast of Australia, from around Queensland to Sydney. Macrophthalmus setosus is found low down on muddy river and creek banks and in exposed sea grass areas in tidal zones, at times near mangroves. Males have a tooth on the upper claw (dactyl). The carapace is around 40 mm wide, and rectangular, greater than 1.7 times wide than long. Eye stalks are long and thin.
Tubuca polita, commonly known as the polished fiddler crab. or pink-clawed fiddler crab is a species of fiddler crab that is found in the northern part of Australia including the Torres Strait Islands
Macrophthalmus crassipes is a species of sentinel crab in the family Macrophthalmidae, found around China, Thailand, Malaysia, Australia, and the Caroline Islands. In Australia it is found from north Western Australia through to New South Wales. Common names include the seagrass sentinel crab and the orange spined sentinel crab. On adult males there is a substantial tooth on the lower claw and a much smaller tooth on the upper claw, and noticeable orange spines on the “wrist” (carpus) of the clawed leg and on the palm of the clawed leg. The carapace is covered in small granules, and is up to around 37 mm (1.5 in) across. It is a burrowing crab, and lives in open tidal flats, muddy or with sandy mud, low on tidal creek banks, and adjacent mangroves.
Tubuca coarctata is a species of fiddler crab found in the western Pacific ocean, including Japan, Taiwan, the Philippines, Indonesia, New Guinea and Australia. The common name of these crabs is either the compressed fiddler crab, or the orange-clawed fiddler crab,. They are found on tidal mud flats adjacent mangroves and muddy tidal creek and river banks.
Tubuca dussumieri, is a species of fiddler crab that is found in the western and south pacific including New Caledonia, Indonesia, Malaysia, Taiwan, Japan, north eastern Australia
Parasesarma messa, commonly known as the maroon mangrove crab, is a species of burrowing crab found in Queensland, Australia. It lives in mangroves in estuaries and sheltered bays. It was originally described as Sesarma messa, but was placed in the genus Parasesarma in 2017. Perisesarma messa is also a synonym.
Tubuca signata, the signalling fiddler crab, is a species of fiddler crab that is found in Australia from Queensland to northwestern Australia.
Tasmanoplax latifrons, commonly known as the southern sentinel crab, is a species of crab found on the south-east coast of Australia, from Tasmania to southern NSW, as far north as the Hunter river. It inhabits tidal mudflats with seagrass, and forms burrows. It is the only species in the genus Tasmanoplax.
Australoplax is a genus of crabs which are spread along the north-eastern coastline of Australia. The only species in this genus is Australoplax tridentata, commonly known as the furry-clawed crab or tuxedo shore crab, found in Queensland, New South Wales and the Northern Territory.
Venitus latreillei, commonly known as the giant sentinel crab, is a species of crab in the family Macrophthalmidae, sub family Macrophthalminae. It is a large sentinel crab, carapace width recorded as up to 60 mm across. It lives in the intertidal zone of the Indo-West Pacific Ocean, including South Africa, Japan, the Philippines, New Caledonia and Northern Australia, south to Moreton Bay on the east coast, to Fremantle on the west, in burrows in the intertidal zone in very soft mud. The carapace is granular, with three distinct teeth on the side, occasionally a fourth smaller one. The claws of adult males have a large serrated tooth on the upper claw. They feed on detritus, and very small worms. Their burrow entries are rectangular or oval shaped rather than circular.
Paracleistostoma wardi is a species of crab first described as Cleistostoma wardi in 1926 by zoologist Mary J. Rathbun and named after former actor, marine collector and later honorary zoologist Charles Melbourne Ward. The type specimens were from mudflats in Sandgate, Queensland, Australia. It is known as Ward's hairy-legged crab, with Rathbun describing it as having "Ambulatory legs" which are "densely hairy". The crabs are small with holotypes 17.6 mm across the carapace and 12.2 mm long. The claws are red to maroon, with the upper moveable male claw (dactyl) having one tooth, at the base. There is orange coloration at the front edges of the carapace behind the eyes. The carapace is smooth, slightly convex, and has no teeth on the sides and looks cut-off at the front edges. It is found in Queensland from Moreton Bay to Cairns.
