WAfruca tangeri is a species of fiddler crab that lives along the Atlantic coasts of southwestern Europe and western Africa.
WAtergatis subdentatus, also known as the red reef crab, dark-finger coral crab or eyed coral crab, is a species of crab in the family Xanthidae.
WChasmagnathus convexus is a common mud-flat crab of the family Varunidae, which is endemic to East Asia. In Japan, this crab is commonly called hamagani. This crab has two forms that differ in color; one is olive green and the other is purple. Differences in diet are believed to be responsible for the color variation between the two forms. C. convexus is large, relative to related crabs, and can reach 4.5 to 5 centimetres wide across its carapace. It is predominantly nocturnal.
WEucrate crenata, the blunt-spined euryplacid crab, is a species of Indo-Pacific crab from the family Euryplacidae. It has invaded the Mediterranean Sea from the Red Sea by Lessepsian migration through the Suez Canal.
WGammarus roeseli is a species of freshwater amphipod native to Europe. G. roeseli are a successful invasive species due to their high reproductive rate, tolerance to changing environmental conditions and unique anti-predation characteristics.
WGecarcinus lateralis, also known by the common names blackback land crab, Bermuda land crab, red land crab and moon crab, is a colourful crab from the family Gecarcinidae.
WHelice tridens is a species of crab which lives on mudflats around the coasts of Japan and the Korean Peninsula.
WHemigrapsus penicillatus is a species of crab. The native range of Hemigrapsus penicillatus extends from the Russian Far East along the coasts of Japan, China, Taiwan and Korea, as far south-west as Hong Kong. Although the species was reported from Hawaii in 1903, this is likely to have been an error; there are no recent records of the species in the central Pacific. Reports of H. penicillatus on the coasts of Europe refer to a related species, H. takanoi, which was only distinguished from H. penicillatus in 2005, several years after its discovery in Europe. Hemigrapsus penicillatus lives in the intertidal zone on stony or muddy shores.
WMetacarcinus edwardsii, sometimes known as mola rock crab, southern rock crab, or Chilean rock crab, is a species of crab from the Pacific coast of South America.
WPerisesarma bidens, the red-clawed crab, is a species of crab found in the Indo-Pacific region from Zanzibar to Japan and Fiji.
WPetrolisthes laevigatus is a species of porcelain crab found in Chile and Peru. Its carapace width is up to 2.5 cm. P. laevigatus lives under rocks in the middle and lower intertidal area. It feeds by filtering zooplankton.