Overview

Comprehensive Description

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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Distribution

Range Description

Turkwell River (Turkana drainage) (Seegers et al. unpublished).
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Range Description

Sabaki River drainage (Seegers et al. 2004).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
No information.

Systems
  • Freshwater
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Habitat and Ecology

Habitat and Ecology
No information.

Systems
  • Freshwater
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:127
Specimens with Sequences:107
Specimens with Barcodes:98
Species:18
Species With Barcodes:17
Public Records:28
Public Species:6
Public BINs:6
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Statistics of barcoding coverage: Marcusenius sp.

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 9
Species With Barcodes: 1
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Barcode data

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2004

Assessor/s
Vreven, E.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)

Contributor/s

Justification
An undescribed species restricted to the Turkwell River of the Turkana drainage.
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IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2004

Assessor/s
Vreven, E.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)

Contributor/s

Justification
This undescribed species has only been recorded from the Sabaki river drainage, Kenya.
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Population

Population
No information.

Population Trend
Unknown
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Population

Population
No information.

Population Trend
Unknown
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Threats

Major Threats
No information available.
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Major Threats
Unknown.
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Management

Conservation Actions

Conservation Actions
No information available.
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Conservation Actions

Conservation Actions
None known.
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Wikipedia

Marcusenius

Marcusenius is a genus of elephantfishes native to Africa.[1] Its members are highly diverse in size, with the smallest species reaching less than 15 cm (5.9 in) and the largest more than 1 m (3.3 ft).[1]

Species[edit]

There are currently 43 recognized species in this genus:[1][2][3][4]

References[edit]

  1. ^ a b c Froese, Rainer, and Daniel Pauly, eds. (2013). Species of Marcusenius in FishBase. April 2013 version.
  2. ^ a b Kramer, B. (2013): Differentiation in morphology and electrical signalling in four species of para- and sympatric Marcusenius (Teleostei: Mormyridae) from Côte d’Ivoire, West Africa. Marine and Freshwater Behaviour and Physiology, 46 (2): 105–133.
  3. ^ a b Kramer, B. & Wink, M. (2013): East–west differentiation in the Marcusenius macrolepidotus species complex in Southern Africa: the description of a new species for the lower Cunene River, Namibia (Teleostei: Mormyridae). Journal of Natural History, Online first, http://dx.doi.org/10.1080/00222933.2013.798699
  4. ^ a b c d Maake, P.A., Gon, O. & Swartz, E.R. (2014): Descriptions of three new species of Marcusenius Gill, 1862 (Teleostei: Mormyridae) from South Africa and Mozambique. Zootaxa, 3780 (3): 455–480.
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Marcusenius sp. nov. 'Turkwell'

Marcusenius sp. nov. 'Turkwell' is a species of fish in the Mormyridae family. It is endemic to Kenya. Its natural habitat is rivers.

Sources[edit]

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