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==Species==
''Geosesarma'' contains these species:<ref name=
{{div col|colwidth=24em}}
*''[[Geosesarma aedituens]]'' <small>Naruse & Jaafar, 2009</small>
*''[[Geosesarma albomita]]'' <small>Yeo & [[Peter Kee Lin Ng|Ng]], 1999</small>
*''[[Geosesarma ambawang]]'' <small>[[Peter Kee Lin Ng|Ng]], 2015</small>
*''[[Geosesarma amphinome]]'' <small>(De Man, 1899)</small>
*''[[Geosesarma anambas]]'' <small>[[Peter Kee Lin Ng|Ng]], Wowor & Yeo, 2023</small>
*''[[Geosesarma angustifrons]]'' <small>(A. Milne-Edwards, 1869)</small>
*''[[Geosesarma araneum]]'' <small>(Nobili, 1899)</small>
*''[[Geosesarma aurantium]]'' <small>[[Peter Kee Lin Ng|Ng]], 1995</small>
*''[[Geosesarma batak]]'' <small>Manuel-Santos, [[Peter Kee Lin Ng|Ng]] & Freitag, 2016</small>
*''[[Geosesarma bau]]'' <small>Ng & Jongkar, 2004</small>
*''[[Geosesarma bicolor]]'' <small>Ng & Davie, 1995</small>
*''[[Geosesarma bintan]]'' <small>T. M. Leong, 2014</small>
*''[[Geosesarma cataracta]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma celebense]]'' <small>(Schenkel, 1902)</small>
*''[[Geosesarma clavicrure]]'' <small>(Schenkel, 1902)</small>
*''[[Geosesarma confertum]]'' <small>(Ortmann, 1894)</small>
*''[[Geosesarma danumense]]'' <small>[[Peter Kee Lin Ng|Ng]], 2003</small>
*''[[Geosesarma dennerle]]'' <small>[[Peter Kee Lin Ng|Ng]], Schubart & Lukhaup, 2015</small>
*''[[Geosesarma foxi]]'' <small>(Kemp, 1918)</small>
*''[[Geosesarma gordonae]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma gracillimum]]'' <small>(De Man, 1902)</small>
*''[[Geosesarma hagen]]'' <small>[[Peter Kee Lin Ng|Ng]], Schubart & Lukhaup, 2015</small>
*''[[Geosesarma hednon]]'' <small>[[Peter Kee Lin Ng|Ng]], Liu & Schubart, 2003</small>
*''[[Geosesarma ianthina]]'' <small>Pretzmann, 1985</small>
*''[[Geosesarma insulare]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma johnsoni]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma katibas]]'' <small>[[Peter Kee Lin Ng|Ng]], 1995</small>
*''[[Geosesarma krathing]]'' <small>[[Peter Kee Lin Ng|Ng]] & Naiyanetr, 1992</small>
*''[[Geosesarma larsi]]'' <small>[[Peter Kee Lin Ng|Ng]] & Grinang, 2018</small>
*''[[Geosesarma lawrencei]]'' <small>Manuel-Santos & Yeo, 2007</small>
*''[[Geosesarma leprosum]]'' <small>(Schenkel, 1902)</small>
*''[[Geosesarma maculatum]]'' <small>(De Man, 1892)</small>
*''[[Geosesarma malayanum]]'' <small>[[Peter Kee Lin Ng|Ng]] & Lim, 1986</small>
*''[[Geosesarma mirum]]'' <small>Shy & [[Peter Kee Lin Ng|Ng]], 2019</small><ref name=":3">{{Cite journal |last1=Shy |first1=Jhy-Yun |last2=Ng |first2=Peter K. L. |date=2019 |title=''Geosesarma mirum'', a new species of semi-terrestrial sesarmid crab (Crustacea, Decapoda, Brachyura) from central Taiwan |journal=ZooKeys |issue=858 |pages=1–10 |doi=10.3897/zookeys.858.35198 |issn=1313-2989 |pmc=6614171 |pmid=31312087|doi-access=free }}</ref>
*''[[Geosesarma nannophyes]]'' <small>(De Man, 1885)</small>
*''[[Geosesarma nemesis]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma noduliferum]]'' <small>(De Man, 1892)</small>
*''[[Geosesarma notophorum]]'' <small>[[Peter Kee Lin Ng|Ng]] & C. G. S. Tan, 1995</small>
*''[[Geosesarma ocypodum]]'' <small>(Nobili, 1899)</small>
*''[[Geosesarma penangense]]'' <small>(Tweedie, 1940)</small>
*''[[Geosesarma peraccae]]'' <small>(Nobili, 1903)</small>
*''[[Geosesarma protos]]'' <small>[[Peter Kee Lin Ng|Ng]] & Takeda, 1992</small>
*''[[Geosesarma rathbunae]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma rouxi]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma sabanum]]'' <small>[[Peter Kee Lin Ng|Ng]], 1992</small>
*''[[Geosesarma sarawakense]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma scandens]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma serenei]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma solomonense]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma starmuhlneri]]'' <small>Pretzmann, 1984</small>
*''[[Geosesarma sumatraense]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma sylvicola]]'' <small>(De Man, 1892)</small>
*''[[Geosesarma ternatense]]'' <small>(Serène, 1968)</small>
*''[[Geosesarma teschi]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma thelxinoe]]'' <small>(De Man, 1908)</small>
*''[[Geosesarma tiomanicum]]'' <small>[[Peter Kee Lin Ng|Ng]], 1986</small>
*''[[Geosesarma vicentense]]'' <small>(Rathbun, 1914)</small>
{{div col end}}
As of March 2015, professor [[Peter Kee Lin Ng|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."<ref name="LiveSci">
==Threats==
''[[Geosesarma dennerle]]'' and ''[[Geosesarma hagen]]'', both originally from [[Java]], are threatened by <!-- potential --> illegal overcollection for the aquarium trade.<ref>{{Cite web |last=Mahbu |first=Amri |date=March 23, 2015 |title=New Species of Javan Vampire Crabs Face Potential Exploitation |url=http://en.tempo.co/read/news/2015/03/23/206652060/New-Species-of-Javan-Vampire-Crabs-Face-Potential-Exploitation}}</ref>
== Geosesarma in captivity ==
''Geosesarma'' (Vampire Crabs) have become extremely popular in the exotic animal hobby over recent years. However there is a lot of misconception about how to best keep them. They are often mistaken for aquatic crabs and kept in unsuitable conditions with excessive amounts of water, which will ultimately leads to shortened life spans. The ideal captive environment for ''Geosesarma'' species is one that consists of 80% land and 20% water. With natural soil and dense planting making up the majority of the terrestrial area. As these species live in the ground, primarily in burrows, soil is vital for their well being, stress reduction and breeding. <ref>{{Cite web |last=Gusmeroli |first=Jascha |date=September 19, 2024 |title=Everything you need to know about Geosesarma Vampire Crabs |url=https://www.indoorecosystem.net/guides/vampire-crab-care-guide |url-status=live |website=www.indoorecosystem.net}}</ref>
While they also require water to survive, it is primarily used for molting and hydration. Both of which can easily be met with a small water volume, enough to cover their entire body completely will suffice. However it is advised to have a depth of at least double their body height to account for any evaporation. Without access to water ''Geosesarma'' crabs will dry out and perish.
It is also important never to mix any other species of ''Geosesarma'' together. While they are a semi social species of crab, they are extremely aggressive towards other species and will almost always kill other species present in their territory.
Environmental Parameters for [https://www.indoorecosystem.net/guides/vampire-crab-care-guide keeping ''Geosesarma crabs'' in captivity]
Water temperature: 22–25°C (71–78°F)
Air Temperature: 22–28°C (71–82°F)
PH: Between 7.5–8.0
KH (carbonate hardness): Between 0–10
GH (general hardness) Between 4–16
Ammonia: 0
Nitrite: 0
Nitrate: Lower than 20 ppm
==References==
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{{Taxonbar|from=Q311106}}
[[Category:
[[Category:Terrestrial crustaceans]]
[[Category:Taxa named by Johannes Govertus de Man]]
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