''Nimbochromis'' is a small

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

haplochromine __NOTOC__ The haplochromine cichlids are a tribe of cichlids in subfamily Pseudocrenilabrinae called Haplochromini. This group includes the type genus ''Haplochromis'' plus a number of closely related genera such as '' Aulonocara'', '' Astatotila ...

cichlid Cichlids () are a large, diverse, and widespread family of percomorph fish in the family Cichlidae, order Cichliformes. At least 1,760 species have been scientifically described, making it one of the largest vertebrate families, with on ...

s mostly

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Lake Malawi Lake Malawi, also known as Lake Nyasa in Tanzania and Lago Niassa in Mozambique, () is an African Great Lakes, African Great Lake and the southernmost lake in the East African Rift system, located between Malawi, Mozambique and Tanzania. It is ...

East Africa East Africa, also known as Eastern Africa or the East of Africa, is a region at the eastern edge of the Africa, African continent, distinguished by its unique geographical, historical, and cultural landscape. Defined in varying scopes, the regi ...

. They are known as sleeper cichlids or ''kaligono'' ("sleepers" in

Chichewa Chewa ( ; also known as Nyanja ) is a Bantu language spoken in Malawi and a recognised minority in Zambia and Mozambique. The noun class prefix ''chi-'' is used for languages, so the language is often called or Chinyanja. In Malawi, the name wa ...

) due to their unique hunting behaviour. These

piscivorous A piscivore () is a carnivorous animal that primarily eats fish. Fish were the diet of early tetrapod evolution (via water-bound amphibians during the Devonian period); insectivory came next; then in time, the more terrestrially adapted rept ...

species are often seen lying motionless on the lake bottom near rocks where

mbuna Mbuna (pronounced Mmm-boo-nah ) is the common name for a large group of African cichlids from Lake Malawi, and are members of the haplochromine tribe within the family Cichlidae. The name ''mbuna'' means "rockfish" in the language of the Tonga pe ...

live, even adopting an unusual sideways position rarely seen in living fish. If smaller fishes approach, the ''Nimbochromis'' will "wake up" and try to seize them. Their coloration has an irregular dark cloudy pattern on lighter background; for one thing, this provides

camouflage Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see, or by disguising them as something else. Examples include the leopard's spotted coat, the b ...

, but it is also suspected that it is – at least in some –

evolving Evolution is the change in the heritable characteristics of biological populations over successive generations. It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certai ...

into

aggressive mimicry Aggressive mimicry is a form of mimicry in which predation, predators, parasites, or parasitoids share similar signalling theory, signals, using a harmless model, allowing them to avoid being correctly identified by their prey or host (biolog ...

(

apparent death Apparent death is a behavior in which animals take on the appearance of being death, dead. It is an immobile state most often triggered by a predatory attack and can be found in a wide range of animals from insects and crustaceans to mammals, b ...

) by imitating a rotting fish

carcass Carcass or Carcase (both pronounced ) may refer to: * Dressed carcass, the body of a livestock animal ready for butchery, after removal of skin, visceral organs, head, feet etc. *Carrion, the decaying dead body of an animal or human being, also c ...

and thus luring

scavenger Scavengers are animals that consume Corpse decomposition, dead organisms that have died from causes other than predation or have been killed by other predators. While scavenging generally refers to carnivores feeding on carrion, it is also a he ...

s to their demise.

Species

There are currently five recognized species in this genus: * '' Nimbochromis fuscotaeniatus'' ( Regan, 1922) (Spothead Hap, Fuscotaeniatus Hap) * '' Nimbochromis linni'' ( W. E. Burgess & H. R. Axelrod, 1975) * ''

Nimbochromis livingstonii ''Nimbochromis livingstonii'', Livingston's cichlid or, ''kalingono'' (in Chichewa), is a freshwater mouthbrooding cichlid native to Lake Malawi, an African Rift Lake. It is also found in the upper Shire River and Lake Malombe. They are foun ...

'' ( Günther, 1894) (Livingston's Cichlid) * '' Nimbochromis polystigma'' ( Regan, 1922) * '' Nimbochromis venustus'' (

Boulenger Boulenger is a surname. Notable people with the surname include: * Benjamin Boulenger (born 1990), French footballer * Edward George Boulenger (1888–1946), British zoologist, director of aquarium at London Zoo * George Albert Boulenger (1858– ...

, 1908) (Giraffe Hap, Venustus Hap)

References

Haplochromini * Cichlid genera Taxa named by Ethelwynn Trewavas {{Pseudocrenilabrinae-stub