Aphyosemion alpha, Huber, 1998

Agnèse, Jean-François, Chirio, Laurent, Legros, Olivier, Oslisly, Richard & Bhé, Hervé Mvé, 2018, Unexpected discovery of six new species of Aphyosemion (Cyprinodontiformes, Aplocheilidae) in the Wonga-Wongué Presidential Reserve in Gabon, European Journal of Taxonomy 471, pp. 1-28 : 25-26

Identification key of the Aphyosemion alpha group species

1. Anal fin without punctuation ............................................................................................................. 2 – Anal fin with punctuation of black or red dots .................................................................................. 3

2. Flanks orange and bluish, ventral region orange, very intense orange portion between the end of the anal fin and the caudal peduncle, head highly red-orange................................................................... ............................................................................... A. rubrogaster Chirio, Legros & Agnèse sp. nov.

– Flanks beige, ventral region orange or beige, blue iridescent scales between the end of the anal fin and the caudal peduncle..................................................................................................................... 4

– Flanks blue or purplish blue, ventral region orange or bluish white, blue iridescent scales between the end of the anal fin and the caudal peduncle ................................................................................. 5

3. Anal fin with some red carmine macules, mauve on basal portion, orange on median portion, a yellowish portion near the submarginal band, red and regular submarginal band, blue marginal band, orange little acumen............................................ A. barakoniense Chirio, Legros & Agnèse sp. nov.

– Anal fin blue with orange portion on basal region, without punctuation except black dots on basal and/or postero-basal portions, without submarginal and marginal bands. Some individuals may have some small black dots instead of the submarginal band...................................................................... ........................................................................... A. flavocyaneum Chirio, Legros & Agnèse sp. nov.

4. Two orange zones: orange portion on the opercle, venter beige with an orange portion above the pelvic fins, anal fin orange, blue near the basal portion and near the red submarginal band, dorsal fin orange, caudal fin blue with begin of upper and lower lobes light orange ......................................................................... A. pusillum Chirio, Legros & Agnèse sp. nov.

– No delimited orange zone, opercle orange, ventral region entirely orange, anal fin orange with a blue zone upper the red submarginal band, dorsal fin blue with large orange zone on rays, caudal fin blue with an orange caudal peduncle .......................... A. aurantiacum Chirio, Legros & Agnèse sp. nov.

5. Dorsal fin brown-orange, greenish on basal portion, red dots between rays, little orange apex, caudal fin light blue, some red dots on basal region, very long red streaks on distal region, red and irregular submarginal band, blue marginal band, little acumens light orange, flanks blue, ventral region orange ................................................................................................................ A. alpha Huber, 1998

– Dorsal fin blue, orange distal portion near the apex, black dots between rays, very long orange acumen on the apex, caudal fin blue with orange portion on peduncle region, some red dots on basal region, very long red streaks on distal region, red and irregular submarginal band, blue marginal band, acumen orange very intense, flanks purplish blue, ventral region bluish white ................................................................... A. flammulatum Chirio, Legros & Agnèse sp. nov.