After the Greek - omega which means 'the end'. This refers to the phylogenic position with A.alpha as 'the beginning'.

Sonnenberg R. 2007.

Description of Three new species of the genus Chromaphyosemion Radda 1971 (Cyprinodontiformes: Nothobranchiidae) from coastal plains of Cameroon with a preliminary review of the Chromaphyosemion splendopleure complex.

Zootaxa 1591: 1-38, 2007.

Chromaphyosemion

Populations

• Kopongo 1 - C 89 / 35
• Kopongo II - C 89 / 36
• ABC 06 / 98
• ADK 09 / 300 - West Cellucam
• C 01 / 62
• CMM 7
• CSK 95 / 27
• ABK 07 / 133

C 01 / 62 - Collected by Kullmann, Misof & Sonnenberg in 2001 in Cameroon. In a stream which crossed the old road from Douala to Edea near Bonepoupa.

ABK 07 / 133 - Sympatric with A.riggenbachi.

Old Cameroon Road from Douala to Edea in a small river called Ngo Njock close to the village Ndog Nyang. This location code CMM 7. Collected by Kämpf, Sonnenberg & Tränkner in 2000.

North of Edea along the road linking Kopongo / Somakek to Bonepoupa.

The type locality was a small forest stream around 0·2m deep with a width up to 3m. The bottom was made up of sand & gravel. No aquatic vegetation present..
Water temperature 26·6°C, air temperature 30°C, pH 6, electrical conductivity 10µS/cm. Sympatric species - E.infrafasciatus, A.ahli, A.franzwerneri, Procatopus sp., unidentified jueveniles of a clariid catfish.

Collections of fish in the area of distribution on A.omega were originally assigned to A.splendopleure but after Sonnenberg's revision they were split to A.omega as a new sp.