Petrocephalus magnoculis Kramer, Bills, Skelton & Wink, 2012
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Family:  Mormyridae (Elephantfishes)
Max. size:  10.9 cm SL (male/unsexed)
Environment:  demersal; freshwater,
Distribution:  Africa: Cunene River below Ruacana Falls in Namibia (Ref. 91771) and Angola (Ref. 120641).
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 20-24; Anal spines: 0-0; Anal soft rays: 26-31. Diagnosis: Body depth 28.3-34.0% of standard length; head length 25.0-27.7% of standard length; preanal length 59.0-62.8% of standard length; anal fin length 21.5-25.6% of standard length; diameter defined by orbital rims 25.9-32.9% of head length; length of snout to posterior orbital rim of eye 47.0-51.4% of head length; length of snout to centre of eye 35.2-39.1% of head length; number of dorsal fin rays 20-24; number of scales in lateral line row 38-42 (Ref. 91771). Description: Body oval shape; head with rounded nose, small ventrally positioned subterminal mouth, situated ventral to the eye; head and body dorsolaterally compressed (Ref. 91771). Dorsal fin origin situated about two-thirds of standard length from snout, obliquely orientated, anteriorly higher and posteriorly lower, distal margin crescentic with anterior two or three rays longer than posterior rays, 20-24 dorsal fin rays (Ref. 91771). Anal fin longer than dorsal fin, opposite dorsal fin with slightly more anterior origin, obliquely orientated, anteriorly lower and posteriorly higher, anterior 10 or so rays longer than posterior ones, especially in males where they also appear stronger, margin broadly rounded, rays posterior to first 10 with distal margin straight, 26-31 anal fin rays (Ref. 91771). Scales cycloid with reticulate striae, scales extending anteriorly to operculum and pectoral fins; scales in lateral series 38-42; scales on caudal peduncle circumference, 11-13 (Ref. 91771). Caudal peduncle slender, subcylindrical entire length, usually 18.4-21.8% of standard length (Ref. 91771). Colour: In life, it is grey-silver, with underside lighter, paired fins light and transparent (Ref. 91771). In preservation, it is light beige, back darker and grey, but brown where mormyrid skin is gone (Ref. 91771).
Biology:  Found in rather strong currents; dicotyledonous trees, extensive reed beds and semiaquatic bushes dominate the river banks, which are rocky or sandy depending on the inside or outside bank (Ref. 91771).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (123251)
Threat to humans:  harmless
Country info:   

Entered by: Boden, Gert - 04.12.12
Modified by: Geelhand, Dimitri - 31.03.14

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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