Perisesarma is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of mangrove crab

Mangrove crab

Mangrove crabs are crabs that live among mangroves, and may belong to many different species and even families. They have been shown to be ecologically significant in many ways. They keep much of the energy within the forest by burying and consuming leaf litter. Along with burrowing in the ground,...

s in the family Sesarmidae

Sesarmidae

Sesarmidae is a family of crabs, previously included in the Grapsidae by many authors. Several species, namely in Geosesarma, Metopaulias and Sesarma, are true terrestrial crabs. They do not need to return to the sea even for breeding.-Genera:...

 (or Grapsidae

Grapsidae

Grapsidae is a family of crabs known variously as marsh crabs, shore crabs or talon crabs. It is not confirmed that the family forms a monophyletic group and some taxa may belong in other families...

 in some classifications) predominantly found in the Indo-Pacific

Indo-Pacific

The Indo-Pacific is a biogeographic region of the Earth's seas, comprising the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the seas connecting the two in the general area of Indonesia...

. There are 23 species as of late 2006 with two from west Africa

West Africa

West Africa or Western Africa is the westernmost region of the African continent. Geopolitically, the UN definition of Western Africa includes the following 16 countries and an area of approximately 5 million square km:-Flags of West Africa:...

: P. kammermani (De Man, 1883) & P. alberti Rathbun, 1921. They are typically small semi-terrestrial crabs found on the forest floor at low tide. They eat nearly anything they can and will try to eat anything that doesn't threaten them — including pencils and other objects dropped on the forest floor. The last species of the genus described is Perisesarma samawati by Gillikin and Schubart (2004). P. samawati can be found in East Africa along with P. guttatum, but its sister species is P. eumolpe from Malaysian mangroves 

Species

• Perisesarma samawati Gillikin and Schubart, 2004
• Perisesarma bengalense Davie, 2003 
• Perisesarma cricotus Rahayu and Davie, 2002
• Perisesarma foresti Rahayu and Davie, 2002
• Perisesarma maipoensis (Soh, 1978)
• Perisesarma messa (Campbell, 1967)
• Perisesarma brevicristatum (Campbell, 1967)
• Perisesarma darwinensis (Campbell, 1967)
• Perisesarma longicristatum (Campbell, 1967)
• Perisesarma lanchesteri (Tweedie
  Michael Tweedie
  Michael Wilmer Forbes Tweedie was a naturalist and archaeologist working in South East Asia, who was Director of the Raffles Museum in Singapore....
  
  , 1936)
• Perisesarma alberti Rathbun, 1921
• Perisesarma indiarum (De Man, 1902)
• Perisesarma fasciatum (Lanchester, 1900)
• Perisesarma onychophorum (De Man, 1895)
• Perisesarma eumolpe (De Man, 1895)
• Perisesarma semperi (Bürger, 1893)
• Perisesarma haswelli (De Man, 1887)
• Perisesarma kammermani (De Man, 1883)
• Perisesarma lividum (A. Milne Edwards, 1869)
• Perisesarma guttatum (A. Milne Edwards, 1869)
• Perisesarma dussumieri (H. Milne Edwards, 1853)
• Perisesarma bidens
  Perisesarma bidens
  Perisesarma bidens, the red-clawed crab, is a species of crab found in the Indo-Pacific region from Zanzibar to Japan and Fiji....
  
  (De Haan, 1835)
• Perisesarma huzardi (Desmarest, 1825)