After the white margin of the anal. Taken from the Greek - leucos meaning white & pterygion meaning fin or wing.

Holotype - Male, 43·6mm Standard length (SL) - 6 cm TL.

D=10-14, A=15-18, ll=28-30 + 3-4. Sonnenberg & Busch 2009.

• D = 11, A = 15, ll = 30 (Poll 1941)(maeseni)
• D = 11-14, A = 15-16, D/A = +5-9, ll = 28-31(+1-3) (Berkenkamp & Etzel 1977)(maeseni)
• D = 9-14, A = 14-18, ll = 27-34 (Radda & Pürzl 1987)(maeseni)

n = 21, A = 26 (Scheel 1990) (maeseni)

leucopterygius

• Aphyosemion cameronensis var. obscurus (non Ahl 1924)
• Aphyosemion liberiense (non Boulenger 1908)
• Aphyosemion maeseni non Poll 1941
• Archiaphyosemion maeseni (non Poll 1941)
• Roloffia maeseni (non Poll 1941)

Populations

• GF06 / 6
• GRC90 / 174 - Lola
  
• Gouessesso (western Ivory Coast/Guineé)
• Gueupleu (Ivory Coast)
• Lema (Lama?)(Ivory Coast)
• Likado
• Lola (Guineé) GRC 90 / 174
• Maliki (Liberia)
• Man
• Masei River (Ivory Coast)
• Mount Nimba (area)
• N'zerekore (Guineé)
• Saglepie (Liberia)
• Salayea (Liberia)
• Saniquellie (Liberia)
• Souba (Ivory Coast)
• T'chiens (Liberia)
• Wadalna (Liberia)
• Zor Zor (Liberia)

Archiaphyosemion aff. maeseni

• Beh ple (northeastern Liberia)

A small, slow flowing creek in rainforest, coverered by tree canopy. Water was slightly brown stained, water temperature 20° C, maximum water depth 40cm.

Inhabits a large area in northeastern Liberia, southwestern Guinea & western Ivory Coast.
Middle Sassandra River drainage, western Ivory Coast. Upper Saint Paul, upper Saint John & upper Cess River drainages, northern Liberia, Upper Saint John & Milo River drainages, eastern Guinea.

Small streams, brooks & pools in areas of forested savannah.

The holotype was collected at Foret Classeé de Dieke, southeastern Guinea by E.Busch & B.Wiese on 16th May 2006. This was collection code GF06 / 6.
Paratypes were collected by H.Olsen between November 1963 - February 1964 at N'zerekore, Guinea. Also E.Roloff in 1971 Salayea, Liberia. Also H.De Bruyn on 24th July 1980 in a rivulet near Déoulé, a small tributary of the Kilo River on a secondary road from Man to Biankouma, Ivory Coast.

History of the synonym Aphyosemion maeseni
First description - Poll M. 1941. Poissons nouveaux de la Cote d'Ivoire. Revue de Zoologie et de Botanique Africaines 34 (2): p 141-142, figure 5.
After Arne Maesen who participated in the collection of this species.
In 1941 Poll described Aphyosemion maeseni from a single specimen, probably a male, collected at the confluense of the Masei & Bon de Boan Rivers which feed into the Noun River at the border of Liberia & Ivory Coast. The fish was collected in 12-13 April 1939 by A.Maesen, F.M.Olbrechts & P.J.Vandenhoute.
Sonnenberg & Busch examined this holotype which turned out to be an Epiplatys sp. which invalidated the original description as Aphyosemion maeseni.
A new species was described under the new genus Nimbapanchax.
Scheel mentions in ROTOW 1 that no other material was published to date (at least until 1968).
Type Locality - Given as 'Confluence between the Masei River & the Bon de Boan River, a tributary of the Noun River, near the border with Liberia, western Ivory Coast' according to Wildekamp (World of Killies Vol I).

Reportedly not an easy species to breed. Eggs water incubate for around 14 days. Sexual maturity is reached at about 6 months.

Thanks to Rainer Sonnenberg for sending the paper 'Description of a new genus & two new species of killifish (Cyprinodontiformes: Nothobranchiidae) from West Africa, with a discussion of the taxonomic status of Aphyosemion maeseni Poll, 1941' Sonnenberg & Busch.