''Geosesarma'' is genus of small

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include ...

terrestrial crab A number of lineages of crabs have evolved to live predominantly on land. Examples of terrestrial crabs are found in the families Gecarcinidae and Gecarcinucidae, as well as in selected genera from other families, such as ''Sesarma'', althoug ...

s, typically less than across the

carapace A carapace is a Dorsum (biology), dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tor ...

. They live and reproduce on land with the larval stages inside the

egg An egg is an organic vessel grown by an animal to carry a possibly fertilized egg cell (a zygote) and to incubate from it an embryo within the egg until the embryo has become an animal fetus that can survive on its own, at which point the a ...

. They are found from

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...

, through

Southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical United Nations geoscheme for Asia#South-eastern Asia, south-eastern region of Asia, consistin ...

, to the

Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capita ...

and

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...

. In the pet trade, they are sometimes called vampire crabs. This has nothing to do with their feeding habits, but rather with the bright, contrastingly yellow eyes of some ''Geosesarma'' species.

Species

''Geosesarma'' contains these species: *'' Geosesarma aedituens'' Naruse & Jaafar, 2009 *'' Geosesarma albomita'' Yeo & Ng, 1999 *'' Geosesarma amphinome'' (De Man, 1899) *'' Geosesarma angustifrons'' (A. Milne-Edwards, 1869) *'' Geosesarma araneum'' (Nobili, 1899) *'' Geosesarma aurantium'' Ng, 1995 *'' Geosesarma bau'' Ng & Jongkar, 2004 *'' Geosesarma bicolor'' Ng & Davie, 1995 *'' Geosesarma bintan'' T. M. Leong, 2014 *'' Geosesarma cataracta'' Ng, 1986 *'' Geosesarma celebense'' (Schenkel, 1902) *'' Geosesarma clavicrure'' (Schenkel, 1902) *'' Geosesarma confertum'' (Ortmann, 1894) *'' Geosesarma danumense'' Ng, 2003 *'' Geosesarma dennerle'' Ng, Schubart & Lukhaup, 2015 *'' Geosesarma foxi'' (Kemp, 1918) *'' Geosesarma gordonae'' (Serène, 1968) *'' Geosesarma gracillimum'' (De Man, 1902) *'' Geosesarma hagen'' Ng, Schubart & Lukhaup, 2015 *'' Geosesarma hednon'' Ng, Liu & Schubart, 2003 *'' Geosesarma ianthina'' Pretzmann, 1985 *'' Geosesarma insulare'' Ng, 1986 *'' Geosesarma johnsoni'' (Serène, 1968) *'' Geosesarma katibas'' Ng, 1995 *'' Geosesarma krathing'' Ng & Naiyanetr, 1992 *'' Geosesarma larsi'' Ng & Grinang, 2018 *'' Geosesarma lawrencei'' Manuel-Santos & Yeo, 2007 *'' Geosesarma leprosum'' (Schenkel, 1902) *'' Geosesarma maculatum'' (De Man, 1892) *'' Geosesarma malayanum'' Ng & Lim, 1986 *'' Geosesarma nannophyes'' (De Man, 1885) *'' Geosesarma nemesis'' Ng, 1986 *'' Geosesarma noduliferum'' (De Man, 1892) *'' Geosesarma notophorum'' Ng & C. G. S. Tan, 1995 *'' Geosesarma ocypodum'' (Nobili, 1899) *'' Geosesarma penangense'' (Tweedie, 1940) *'' Geosesarma peraccae'' (Nobili, 1903) *'' Geosesarma protos'' Ng & Takeda, 1992 *'' Geosesarma rathbunae'' (Serène, 1968) *'' Geosesarma rouxi'' (Serène, 1968) *'' Geosesarma sabanum'' Ng, 1992 *'' Geosesarma sarawakense'' (Serène, 1968) *'' Geosesarma scandens'' Ng, 1986 *'' Geosesarma serenei'' Ng, 1986 *'' Geosesarma solomonense'' (Serène, 1968) *'' Geosesarma starmuhlneri'' Pretzmann, 1984 *'' Geosesarma sumatraense'' Ng, 1986 *'' Geosesarma sylvicola'' (De Man, 1892) *'' Geosesarma ternatense'' (Serène, 1968) *'' Geosesarma teschi'' Ng, 1986 *'' Geosesarma thelxinoe'' (De Man, 1908) *'' Geosesarma tiomanicum'' Ng, 1986 *'' Geosesarma vicentense'' (Rathbun, 1914) As of March 2015, professor Peter Ng of National University of Singapore has named 20 ''Geosesarma'' species, and he "has another half a dozen or so newly collected ''Geosesarma'' species from Southeast Asia in his lab, and these species still need to be named and described."

Threats

'' Geosesarma dennerle'' and '' Geosesarma hagen'', both originally from

Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...

, are threatened by illegal overcollection for the aquarium trade.

References

External links

* Grapsoidea Terrestrial crustaceans Taxa named by Johannes Govertus de Man {{crab-stub