Trichodactylidae is a family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of crab

Crab

True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...

s, in its own superfamily, Trichodactyloidea. They are all freshwater

Freshwater

Fresh water is naturally occurring water on the Earth's surface in ice sheets, ice caps, glaciers, bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Fresh water is generally characterized by having low concentrations of dissolved salts and...

 animals from Central

Central America

Central America is the central geographic region of the Americas. It is the southernmost, isthmian portion of the North American continent, which connects with South America on the southeast. When considered part of the unified continental model, it is considered a subcontinent...

 and South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

, including some offshore islands, such as Ilhabela, São Paulo

São Paulo (state)

São Paulo is a state in Brazil. It is the major industrial and economic powerhouse of the Brazilian economy. Named after Saint Paul, São Paulo has the largest population, industrial complex, and economic production in the country. It is the richest state in Brazil...

. Only one of the 50 species is known from the fossil record, Sylviocarcinus piriformis from the Miocene

Miocene

The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...

 of Colombia

Colombia

Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...

. The family contains 15 genera in two subfamilies:
Subfamily Dilocarcininae Pretzmann, 1978

• Bottiella Magalhães & Türkay, 1996
• Dilocarcinus H. Milne-Edwards, 1853
• Forsteria Bott, 1969
• Fredilocarcinus Pretzmann, 1978
• Goyazana Bott, 1969
• Melocarcinus Magalhães & Türkay, 1996
• Moreirocarcinus Magalhães & Türkay, 1996
• Poppiana Bott, 1969
• Rotundovaldivia Pretzmann, 1968
• Sylviocarcinus H. Milne-Edwards, 1853
• Valdivia White, 1847
• Zilchiopsis Bott, 1969

Subfamily Trichodactylinae H. Milne-Edwards, 1853

• Avotrichodactylus Pretzmann, 1968
• Rodriguezia Bott, 1969
• Trichodactylus Latreille, 1829