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Geosesarma dennerle is a species of small land-living crabs found on Java, Indonesia. [1] It is popular in the aquarium trade, [1] where G. dennerle, in particular, is often simply called Vampire Crab. Crabs called "Geosesarma bicolor Krakatau Vampirkrabbe" are probably also G. dennerle. [1]
Geosesarma is genus of small freshwater or terrestrial crabs, typically less than 10 mm (0.4 in) across the carapace. [2] They live and reproduce on land with the larval stages inside the egg. They are found from India, [3] through Southeast Asia, to the Solomon Islands and Hawaii. [2] In the pet trade, they are sometimes called vampire crabs.
Geosesarma hagen is a species of small land-living crabs only found in Java, Indonesia. The crabs prefer a humid environment with elements from both terrestrial and freshwater aquatic habitats. They steer clear of drier land and although the younger crabs tend to live in closer proximity to the water, they are not aquatic crabs.
The crabs can travel up to 1.46 km (0.91 mi) in a day, and up to 4 km (2.5 mi) in total. [4] Only a few land crabs, including certain Geosesarma species, have direct development (the mother carries the eggs until they have become tiny, fully developed crabs), and these do not need access to water to breed.
Geosesarma rouxi is a species of small, semi-terrestrial freshwater crabs native to Java, Indonesia. [ 1 ] [ 2 ] They are commonly known in the pet trade as rainbow vampire crabs. [ 2 ]
Pseudothelphusidae (Central America and South America) The fossil record of freshwater organisms is typically poor, so few fossils of freshwater crabs have been found. The oldest is Tanzanonautes tuerkayi, from the Oligocene of East Africa, and the evolution of freshwater crabs is likely to postdate the break-up of the supercontinent Gondwana. [2]
Between 2018 and 2021, there was an unexpected 92% decline in snow crab abundance, or about 10 billion crabs. The crabs had been plentiful in the years prior, puzzling scientists and crabbers alike.
Crabs vary in size from the pea crab, a few millimeters wide, to the Japanese spider crab, with a leg span up to 4 m (13 ft). [6] Several other groups of crustaceans with similar appearances – such as king crabs and porcelain crabs – are not true crabs, but have evolved features similar to true crabs through a process known as carcinisation .