Marcusenius fuscus (Pellegrin 1901)

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Environment:

demersal; freshwater

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorPascualita Sa-a, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=10893

Electric Organ Discharge:

The EOD of Marcusenius fuscus is at present unknown.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2110

Statistics of barcoding coverage: Marcusenius fuscus:

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Specimens with Barcodes: 4
Species With Barcodes: 1

Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorSujeevan Ratnasingham, Paul D.N. Hebert, Barcode of Life Data Systems (BOLD)
Sourcehttp://www.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=460406

IUCN Red List Assessment:
Red List Category

LC
Least Concern

Red List Criteria

Version

3.1

Year Assessed

2010

Assessor/s

Moelants, T.

Reviewer/s

Brummett, R., Mbe Tawe, A.N., Dening Touokong, C., Reid, G.M., Snoeks, J. Staissny, M., Moelants, T., Mamonekene, V., Ndodet, B., Ifuta, S.N.B., Chilala, A., Monsembula, R., Ibala Zamba, A., Opoye Itoua, O., Pouomogne, V., Darwall, W. & Smith, K.

Contributor/s

Justification

The species is widespread or without major threats throughout the Central Africa assessment region and is assessed as Least Concern.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182588

Population:

Population

No information available.

Population Trend

Unknown
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182588

Threats:

Major Threats

None known.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182588

General Description:

Translated from original description by J. Pellegrin (1901)

Body depth contained 4 times in length (minus the caudal), the length of the head 4½ times in length. HL noticeably longer than its depth, dorsal profile rounded, convex. Snout a little less than 1/3 HL. Mouth situated at the level of the ventral border of eye, its width slightly inferior to the snout length. Teeth somewhat scalloped, 5 / 6. Chin with moderately swelling. Eye diameter ½ snout length, 1/7 HL. Dorsal fin composed of 24 or 25 rays beginning above the 6th anal ray; the length of its base equal to a little more than ½ the distance that separates it from the head. Anal fin with 29 to 32 rays, its base about equal to the distance that separates its first ray from the origin of the pelvic fin. The rounded pectoral fin is 2/3 HL and extends beyond the base of the pelvic. Pelvic fin a little more than ½ length of the pectoral. Caudal mostly covered with scales, its lobes elongate and rounded. Caudal peduncle is a little more than 2 times longer than deep, 2/3 of HL, with 8 circumpeduncular scales. Lateral line with 57 scales. Uniformly chocolate brown.

D. 24-25, A. 29-32, P. 10, V.6, L.lat. 57, L. transv. 10 / 14

No. 90 — 8 and 9. Coll. Mus. Congo Thollon.

Total length: 225 and 215 mm.

This species is similar to Gnathonemus leopoldianus Boulenger from Lac Leopold II, but has only 8 scales around the caudal peduncle, similar to G. moorii Günther of the Ogooué and Lower Congo from which it differs by its longer body and more numerous scales (57 instead of 43-49) and similar to G. schilthuisiae Boulenger of Lac Leopold II from which it differs by its shorter dorsal and anal fins, its barely visible chin swelling, and its smaller eye and coloration.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Pellegrin, J., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2110

Least Concern (LC)

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorPascualita Sa-a, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=10893

Range Description:

Marcusenius fuscus is known from Pool Malebo (Stanley Pool) and from the Central Congo River basin. It is not known from the central and southern regions of the Democratic Republic of the Congo though.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182588

Conservation Actions:

Conservation Actions

None known.
Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorInternational Union for Conservation of Nature and Natural Resources
Sourcehttp://www.iucnredlist.org/apps/redlist/details/182588
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith