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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 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 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.
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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.
After living for a short time as larvae in the ocean, the juveniles must do this migration in reverse. In many tropical areas with land crabs, these migrations often result in considerable roadkill of migrating crabs. [17]: 113–114 Once crabs have become juveniles, they still have to keep moulting many more times to become adults.
The crabs had been plentiful in the years prior, puzzling scientists and crabbers alike. A rapid warming of water temperatures and loss of sea ice from 2018 to 2019 made conditions less favorable ...
More than 1,300 described species of freshwater crabs are known, out of a total of 6,700 species of crabs across all environments. [1] The total number of species of freshwater crabs, including undescribed species, is thought to be up to 65% higher, potentially up to 2,155 species, although most of the additional species are currently unknown to science. [1]