IUCN threat status:

Vulnerable (VU)

Comprehensive Description

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General Description

Practical key for Marcusenius species with eight circumpeduncular scales from Boden et al. (1997)

Note: This key applies ONLY to those species with large scales and eight scales around the peduncle.

Fewer than 29 dorsal-fin rays, dorsal-fin origin posterior to or in line with the anal fin origin and dorsal-fin length shorter than anal-fin length. → 2

- More than 26 dorsal-fin rays, dorsal-fin origin anterior to the anal-fin origin and dorsal-fin length equal to or greater than anal-fin length → 7

2: 21 or more transverse scale rows between dorsal- and anal-fin origins and more than 42 lateral-line scales → 3

- 20 or fewer transverse scale rows between dorsal- and anal-fin origins and fewer than 45 lateral-line scales → 6

3: Dorsal fin slightly concave with rounded anterior margin, dorsal-fin rays 22-26, anal fin rays 31-34, 54-61 lateral-line scales and total vertebrae 48-49. → Marcusenius fuscus

- Dorsal fin deeply concave with pointed anterior margin; not with all these characters → 4

4: Two rows of scales on transverse dark band between dorsal- and anal-fin origins, submental swelling small, 42-54 lateral-line scales and 32-35 anal-fin rays. → Marcusenius schilthuisiae

- Three or more rows of scales on a transverse dark band between dorsal- and anal-fin origin, sub-mental swelling well developed, 49-61 lateral-line scales and 26-33 anal-fin rays → 5

5: 20-23 dorsal-fin rays; 26-30 anal-fin rays and dorsal-fin height about same as its length which is approximately 25% of the predorsal distance → Marcusenius dundoensis

- 24-28 dorsal-fin rays; 29-33 anal-fin rays and dorsal-fin height less than its length which is approximately 35% of the predorsal distance. → Marcusenius sanagaensis

6: Mouth subinferior; three scale rows on transverse dark band between dorsal- and anal-fin origin → Marcusenius intermedius

- Mouth terminal; two, sometimes three, scale rows on transverse dark band between dorsal- and anal-fin origin. → Marcusenius moorii

7: 27-31 dorsal-fin rays; ratio dorsal-fin length/anal-fin length < 1.25. → Marcusenius kutuensis

- 32-34 dorsal-fin rays; ratio dorsal-fin length/anal-fin length > 1.25. → Marcusenius ghesquierei

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Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Boden, G.; Teugels, G.; Hopkins, C.D.

Source: Africhthy

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