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Zosimus aeneus, also known as the devil crab, toxic reef crab, and devil reef crab is a species of crab that lives on coral reefs in the Indo-Pacific from East Africa to Hawaii. It grows to a size of 60 mm × 90 mm (2.4 in × 3.5 in) and has distinctive patterns of brownish blotches on a paler background.
The coconut crab (Birgus latro) is a terrestrial species of giant hermit crab, and is also known as the robber crab or palm thief. It is the largest terrestrial arthropod known, with a weight of up to 4.1 kg (9 lb). The distance from the tip of one leg to the tip of another can be as wide as 1 m (3 ft 3 in).
Xanthidae is a family of crabs known as gorilla crabs, mud crabs, pebble crabs or rubble crabs. [1] Xanthid crabs are often brightly coloured and are highly poisonous, containing toxins which are not destroyed by cooking and for which no antidote is known.
Atergatis roseus, the pancake crab, is a species of reef crab from the family Xanthidae with a natural range extending from the Red Sea to Fiji. It has colonised the eastern Mediterranean by Lessepsian migration through the Suez Canal. The flesh of this crab, like many other species in the family Xanthidae, is toxic.
Lybia edmondsoni is a species of small crab in the family Xanthidae and is endemic to the Hawaiian Islands.Like other members of the genus Lybia, it is commonly known as the pom-pom crab or boxer crab because of its habit of carrying a sea anemone around in each of its claws, these resembling pom-poms or boxing gloves.
The meat of Atergatis floridus, like that of many related crab species from the family Xanthidae is toxic.The toxins are synthesised by bacteria of the genus Vibrio which live in symbiosis with the crab and the poisons are one similar to those found in puffer fish, i.e. tetrodotoxin, and also saxitoxin which is the primary toxin involved in paralytic shellfish poisoning.
As crab density in an invaded area increases, so does the breadth of the species' diet, which suggests that competition alters selection of food. [4] There currently is no mitigation against these crabs. A natural enemy of H. sanguineus is Sacculina polygenea, [5] a parasite that attacks adult shore crabs and is specific to H. sanguineus. [6]
A pea crab (yellow in color) has fallen out of the clam that this sea otter is eating, and has landed on the sea otter's neck (in Moss Landing, California). The relationship between the pea crab and its host is one of parasitism, rather than commensalism, since the host may be harmed by the crab's feeding activities. [4]