Engaeus is a genus of freshwater crayfish

Crayfish

Crayfish, crawfish, or crawdads – members of the superfamilies Astacoidea and Parastacoidea – are freshwater crustaceans resembling small lobsters, to which they are related...

 found in Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. Fifteen of the 35 species in the genus occur in Tasmania

Tasmania

Tasmania is an Australian island and state. It is south of the continent, separated by Bass Strait. The state includes the island of Tasmania—the 26th largest island in the world—and the surrounding islands. The state has a population of 507,626 , of whom almost half reside in the greater Hobart...

, where they are known as the Tasmanian land crayfish. The behaviour of these crayfish is notable as they live in burrows and construct large "chimneys" at the opening.

All of the 35 species of Engaeus have been assessed for the IUCN Red List

IUCN Red List

The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...

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Data Deficient

Data Deficient

Data Deficient is a category applied by the IUCN, other agencies, and individuals to a species when the available information is not sufficient for a proper assessment of conservation status to be made...

• Engaeus affinis Smith & Schuster, 1913
• Engaeus curvisuturus Horwitz, 1990
• Engaeus karnanga Horwitz, 1990
• Engaeus laevis (Clark, 1941)
• Engaeus nulloporius Horwitz, 1990

Critically Endangered

Critically Endangered

Critically Endangered is the highest risk category assigned by the IUCN Red List for wild species. Critically Endangered means that a species' numbers have decreased, or will decrease, by 80% within three generations....

• Engaeus granulatus Horwitz, 1990
• Engaeus mallacoota Horwitz, 1990
• Engaeus spinicaudatus Horwitz, 1990
• Engaeus sternalis (Clark, 1936)

Endangered species

Endangered species

An endangered species is a population of organisms which is at risk of becoming extinct because it is either few in numbers, or threatened by changing environmental or predation parameters...

• Engaeus disjuncticus Horwitz, 1990
• Engaeus martigener Horwitz, 1990
• Engaeus phyllocercus Smith & Schuster, 1913

Vulnerable species

Vulnerable species

On 30 January 2010, the IUCN Red List of Threatened Species identified 9694 Vulnerable species, subspecies and varieties, stocks and sub-populations.-References:...

• Engaeus rostrogaleatus Horwitz, 1990
• Engaeus urostrictus Riek, 1969
• Engaeus yabbimunna Horwitz, 1994

Near Threatened

Near Threatened

Near Threatened is a conservation status assigned to species or lower taxa that may be considered threatened with extinction in the near future, although it does not currently qualify for the threatened status...

• Engaeus australis Riek, 1969
• Engaeus orramakunna Horwitz, 1990
• Engaeus victoriensis Smith & Schuster, 1913

Least Concern

Least Concern

Least Concern is an IUCN category assigned to extant taxon or lower taxa which have been evaluated but do not qualify for any other category. As such they do not qualify as threatened, Near Threatened, or Conservation Dependent...

• Engaeus cisternarius Suter, 1977
• Engaeus cunicularius (Erichson, 1846)
• Engaeus cymus (Clark, 1936)
• Engaeus fossor (Erichson, 1846)
• Engaeus fultoni Smith & Schuster, 1913
• Engaeus hemicirratulus Smith & Schuster, 1913
• Engaeus lengana Horwitz, 1990
• Engaeus leptorhynchus Clark, 1936
• Engaeus lyelli (Clark, 1936)
• Engaeus mairener Horwitz, 1990
• Engaeus merosetosus Horwitz, 1990
• Engaeus orientalis Clark, 1941
• Engaeus quadrimanus Clark, 1936
• Engaeus sericatus Clark, 1936
• Engaeus strictifrons (Clark, 1936)
• Engaeus tayatea Horwitz, 1990
• Engaeus tuberculatus Clark, 1936