''Nothobranchius ditte'' is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

of brightly colored seasonal

killifish A killifish is any of various oviparous (egg-laying) cyprinodontiform fish, including families Aplocheilidae, Pantanodontidae, Cyprinodontidae, Fundulidae, Nothobranchiidae, Profundulidae, Aphaniidae and Valenciidae. All together, there ar ...

in the family

Nothobranchiidae Nothobranchiidae are a Family (biology), family of Osteichthyes, bony fishes containing roughly 300 species, also known as African rivulines. They are small killifish, usually measuring about . They are limited to Africa, living in fresh water bu ...

, belonging to the '' Nothobranchius brieni''

species complex In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth ...

. It is

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 ...

to freshwater habitats in the south-eastern parts of the

Democratic Republic of the Congo The Democratic Republic of the Congo (DRC), also known as the DR Congo, Congo-Kinshasa, or simply the Congo (the last ambiguously also referring to the neighbouring Republic of the Congo), is a country in Central Africa. By land area, it is t ...

. Adult males reach a length of about 40–42 mm, but the females are slightly smaller. The species is a semi-annual

. They inhabit ephemeral pools filled by rainwater during the monsoon season, being adapted to the alteration of dry and wet seasons. As with all members of the genus ''Nothobranchius'', they show extreme life-history adaptations: their embryos survive by entering a three or four month long

diapause In animal dormancy, diapause is the delay in development in response to regular and recurring periods of adverse environmental conditions.Tauber, M.J., Tauber, C.A., Masaki, S. (1986) ''Seasonal Adaptations of Insects''. Oxford University Press It ...

, within eggs that have a very hard chorion and are resistant to

desiccation Desiccation is the state of extreme dryness, or the process of extreme drying. A desiccant is a hygroscopic (attracts and holds water) substance that induces or sustains such a state in its local vicinity in a moderately sealed container. The ...

and hypoxia. When the habitats dry up, the adult fish die and the eggs survive encased in the clay during the dry season.

Type locality and type material

The type locality is stated as "Ephemeral swamps of the Katate system, about 9.5 km northwest of Kilwa village,

Lake Mweru Lake Mweru (also spelled ''Mwelu'', ''Mwero'') (, ) is a freshwater lake on the longest arm of Africa's second-longest river, the Congo. Located on the border between Zambia and Democratic Republic of the Congo, it makes up of the total length ...

basin, Democratic Republic of Congo, 09°12'33"S, 28°17'01"E". The

holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

of the

taxon In biology, a taxon (back-formation from ''taxonomy''; : taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular name and ...

is a 33.0 mm long male

zoological specimen A zoological specimen is an animal or part of an animal preserved for scientific use. Various uses are: to verify the identity of a (species), to allow study, increase public knowledge of zoology. Zoological specimens are extremely diverse. Exampl ...

reposited as "MRAC 2016-027-P-0001" at the

Royal Museum for Central Africa The Royal Museum for Central Africa (RMCA) (; ; ), communicating under the name AfricaMuseum since 2018, is an ethnography and natural history museum situated in Tervuren in Flemish Brabant, Belgium, just outside Brussels. It was originally b ...

Tervuren Tervuren (; ) is a municipality in the province of Flemish Brabant, in the Flemish region of Belgium. The municipality comprises the villages of Duisburg, Tervuren proper, Vossem and Moorsel. On 1 January 2006, Tervuren had a total population o ...

, Belgium, together with 12

paratype In zoology and botany, a paratype is a specimen of an organism that helps define what the scientific name of a species and other taxon actually represents, but it is not the holotype (and in botany is also neither an isotype (biology), isotype ...

s. Nagy gave it the

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

''ditte'' in honour of his wife, Edit Csikós, "Ditte" being her nickname, for the care keeping all the fish alive during the absences of the author.

Links

''Nothobranchius ditte''
on WildNothos - various information and photographs of this species

References

{{Taxonbar, from=Q60513855 ditte Fish of the Democratic Republic of the Congo Endemic fauna of the Democratic Republic of the Congo Fish described in 2018