Cichlids are fish from the family Cichlidae in the order Cichliformes. Cichlids were traditionally classed in a suborder, the [Labroidei]], along with the wrasses (Labridae), in the order Perciformes, but molecular studies have contradicted this grouping. The closest living relatives of cichlids are probably the convict blennies, and both families are classified in the 5th edition of Fishes of the World as the two families in the Cichliformes, part of the subseries Ovalentaria. This family is both large and diverse. At least 1,650 species have been scientifically described, making it one of the largest vertebrate families. New species are discovered annually, and many species remain undescribed. The actual number of species is therefore unknown, with estimates varying between 2,000 and 3,000.
Crenicichla is a genus of cichlids native to South America commonly known as the pike cichlids. They are found in most tropical and subtropical freshwater habitats between the Andes and the Atlantic.
Apistogramma is a large genus of freshwater fish in the family Cichlidae found in South America, but also commonly kept in aquariums. They are dwarf cichlids that mostly feed on tiny animals and have breeding behaviors that vary depending on the exact species.
Aequidens is a genus of fish in the family Cichlidae found in South America. Formerly a wastebasket genus, as presently defined Aequidens is largely restricted to the Amazon Basin, Orinoco Basin and river basins in The Guianas. The only exceptions are A. plagiozonatus which also occurs in the Paraná Basin, and A. tetramerus which also occurs in the Parnaíba River.
Geophagus is a genus of cichlids that mainly live in South America as far south as Argentina and Uruguay, but a single species, G. crassilabris is from Panama. They are found in a wide range of freshwater habitats. They are part of a group popularly known as eartheaters and mostly feed by picking up mouthfuls of sediment to sift out food items such as invertebrates, plant material and detritus. The largest species reach up to 28 cm (11 in) in standard length. They are often kept in aquariums.
Maylandia or Metriaclima is a genus of haplochromine cichlids endemic to Lake Malawi in East Africa. They belong to the mbuna (rock-dwelling) haplochromines.
Protomelas is a genus of haplochromine cichlids endemic to Lake Malawi in East Africa. The genus is part of the haplochromine tribe and have maternal mouthbrooding and sexual dimorphism typical of this group. Popular in the aquarium hobby, Protomelas species are sold under a variety of trade names.
Thoracochromis is a fish genus of haplochromine cichlids that are endemic to Africa. Most species are from rivers in Angola and Namibia, or the Congo River Basin in Central Africa, but T. wingatii is from the Nile system. Additionally, there are a few apparently undescribed species from the Nile system, which appear to be close relatives of T. wingatii or Haplochromis loati. Many species have been moved between this genus and Haplochromis, and while some consensus has been reached in recent years, their mutual delimitation is still far from settled.
Australoheros is a fish genus in the cichlid family. Most are restricted to rivers and streams in southeastern Brazil, Paraguay, Uruguay and northeastern Argentina, but at least one species is also found in lakes and swamps. This genus was erected after a taxonomic revision in 2006. These are relatively small cichlids that typically do not surpass 10–15 centimetres (4–6 in) in length, although A. facetus reaches about 20 cm (8 in).
Lepidiolamprologus is a small genus of cichlids endemic to Lake Tanganyika in eastern Africa. It is closely related to Altolamprologus. and there is the possibility that a revision of the genus could see more species added.
Astatotilapia is a genus of small freshwater fish in the family Cichlidae found in Eastern and Northern Africa, with a single species, A. flaviijosephi, in Western Asia. Many species have been moved between this genus and Haplochromis, and while some consensus has been reached in recent years, their mutual delimitation is still far from settled. Based on mtDNA, Astatotilapia as currently defined is polyphyletic.
Teleocichla is a genus of fish in the family Cichlidae found in the Tapajós, Xingu, Tocantins and Jari River basins, which are part of the Amazon River Basin in Brazil. All species are rheophilic, and highly elongated in shape. They generally are smaller than 9 cm (3.5 in) in length, making them some of the smallest cichlids of the Americas. Only T. preta can grow larger, reaching about 12 cm (4.7 in). Since restricted to areas with fast currents, they are particularly vulnerable to the building of dams, and the Belo Monte Dam may cause the extinction of T. centisquama. Other species recognized as threatened by Brazil's Ministry of the Environment are T. cinderella, T. prionogenys and T. wajapi.
Haplochromis is a ray-finned fish genus in the family Cichlidae. It has been used as the default "wastebin taxon" for Pseudocrenilabrinae cichlids of the East African Rift, and as such became the "largest" fish "genus". Many of these cichlids are popular aquarium fishes; like similar Haplochromini they are known as "haplos", "happies" or "haps" among aquarium enthusiasts.
Laetacara is a small genus of cichlids native to freshwater habitats in tropical and subtropical South America, ranging from the upper Orinoco River basin in Venezuela to the Paraná River basin Argentina. The genus is also collectively known as the smiling acaras. Like all cichlids, Laetacara species have well-developed brood care.
Mesonauta, the flag cichlids, is a small genus of cichlids native to the Amazon, Orinoco, Essequibo, Paraná and Paraguay basins in South America. Mesonauta is included in the subfamily Cichlasomatinae. They occur in various freshwater habitats such as streams and lakes, especially in areas with little water movement and aquatic vegetation. They are generally found in small groups that stay near the water surface. To avoid predators, adults may jump out of the water and juveniles mimic leaves.
Docimodus evelynae is a species of haplochromine cichlid. It is endemic to Lake Malawi; it is widespread in the lake and found in Malawi, Mozambique, and Tanzania. This species has unusual feeding habits: it feeds upon the flank scales of cichlids or cyprinids and the skin of catfishes. The specific name honours Evelyn Axelrod, the wife of the publisher Herbert R. Axelrod (1927-2017).
Docimodus johnstoni is a species of haplochromine cichlid. It is known from Lake Malawi, Lake Malombe, and the upper Shire River in Malawi, Mozambique, and Tanzania. This species has unusual feeding habits: it is reported to feed on fins of clariid catfishes. The specific name honours the British explorer, botanist, linguist and Colonial administrator, Sir Henry Hamilton Johnston, who presented the type to the British Museum.
Lethrinops is a genus of haplochromine cichlids endemic to Lake Malawi in East Africa. Particularly in the aquarium hobby, they are known as the sandeaters or sandsifters.
Sargochromis is a genus of haplochromine cichlids native to freshwater habitats in Southern Africa, where found in the upper and middle Zambezi basin, Okavango delta, Cunene basin, Cuvelai basin and southeastern Congo basin. They are typically known as happies or smallmouths. The latter name refers to their small mouth compared to their close relatives, the largemouths of the genus Serranochromis. Unlike the species in that genus which mostly feed on other fish, Sargochromis mostly feed on invertebrates, but in some species plant material is important. On occasion they will also eat small fish, and the stomachs of S. carlottae and S. codringtonii commonly contain fish scales, but whether these are already-lost scales that are picked off the bottom or they are actively bumped off large fish is unknown. Some of the species that feed heavily on aquatic snails have been used for biological pest control. Sargochromis are mouthbrooders. Depending on the exact species, they reach a maximum total length of 20 to 48 cm (8–19 in).
Schwetzochromis neodon is a species of rheophilic cichlid endemic to the Democratic Republic of the Congo where it is only known from the Fwa River in the Congo Basin. It can reach a length of 10.7 centimetres (4.2 in) SL. It is currently the only known member of its genus, but several others that formerly were included have been moved to Orthochromis.
