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Nothobranchius ditte  Nagy, 2018

 

Nagy, B. 2018Nothobranchius ditte, a new species of annual killifish from the Lake Mweru basin in the Democratic Republic of the Congo (Teleostei: Nothobranchiidae). Ichthyological Exploration of Freshwaters, 28 (2): 115–134.

 

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Biotic index

Holotype

MRAC 2016-027-P-0001, holotype, male, 33.0 mm SL; DR Congo: Lake Mweru basin: ephemeral swamps of the Katate system, about 9.5 km northwest of Kilwa village, 09°12'33" S, 28°17'01" E; B. Nagy, A. Chocha Manda & G. Petneházy, 13 Apr 2016.

Paratypes

MRAC 2016-027-P-0002-3 (2); MRAC 2016-027-P-0029-31 (3); MRAC 2016-027-P-0004-10 (7).

Diagnosis

Nothobranchius ditte is distinguished from all other species of the N. brieni species group, with the exception of N. milvertzi, by having anal and caudal fins with slender orange subdistal band and broad dark brown distal band. Further, N. ditte is distinguished from N. milvertzi by having caudal fin yellow to light blue, with red-brown spots proximally and medially (vs. plain red); and smaller caudal peduncle length (130–140 % of its depth vs. 141–159).

Classification

Subgenus: Zononothobranchius

Species group: N. brieni group

Taxonomic status

Nothobranchius ditte was established as a species by Nagy in 2018.

Type locality

DR Congo: Lake Mweru basin: ephemeral swamps of the Katate system, about 9.5 km northwest of Kilwa village, 09°12'33" S, 28°17'01" E.

Distribution

This species is endemic to freshwater habitats in south-eastern Democratic Republic of the Congo. It is known from seasonal pools and swamps of river drainages in the south-western part of the Lake Mweru basin.

Elevation

933–973 m

Ecology

Water parameters at type locality (Nagy, 2018):

Water temperature: 24.6 °C

pH: 7.31

Total dissolved solids: 58 ppm

Syntopic congeners

None

Reproduction

This species has an annual life cycle

Embryonic development under captive conditions in peat moss is about three to four months at room temperature.

Size

Maximum size reported: 42.4 mm SL (MRAC 2016-027-P-0029, paratype, male)

Chromosome

Diploid chromosome number 2n = 39 for males and 2n = 40 for females (Simanovsky et al., 2018); NF = 64/64, karyotype structure 13m+12sm+14st/a for males and 12m+12sm+16st/a for females (Krysanov & Demidova, 2018).

Etymology

The specific epithet is given in honour after the wife of the author, Edit Csikós, after her nickname. A noun in the nominative singular standing in apposition to the generic name.

Conservation status

Vulnerable B1ab(iii) (Nagy, B. & B. Watters, 2019);

Recommended as Vulnerable (B1bii) in Nagy, 2018.

References

     Nagy, B. 2017. Collecting Killies in the Democratic Republic of Congo. Tropical Fish Hobbyist, #724, May/June 2017, 65 (5): 46–52. [collecting as Nothobranchius species]

    Nagy, B. 2018. Nothobranchius ditte, a new species of annual killifish from the Lake Mweru basin in the Democratic Republic of the Congo (Teleostei: Nothobranchiidae). Ichthyological Exploration of Freshwaters, 28 (2): 115–134. [taxonomy as Nothobranchius ditte]

    Nagy, B. & B. Watters. 2019. Nothobranchius ditte. The IUCN Red List of Threatened Species 2019: e.T131470719A131470723. [conservation]

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Distribution map

 

Collecting period

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