Marcusenius dundoensis (Poll 1967)

Onglets principaux

EOL Text

Size:

to 123 mm SL

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2107

Maximum size: 123 mm SL

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorFishWise Professional, FishWise Professional
Sourcehttp://www.fishwisepro.com/Species/details.aspx?Zoom=True&SId=20227

Max. size:

12.3 cm SL (male/unsexed; (Ref. 27691))

Licensehttp://creativecommons.org/licenses/by-nc/3.0/
Rights holder/AuthorPascualita Sa-a, FishBase
Sourcehttp://www.fishbase.org/summary/SpeciesSummary.php?id=10890

Diagnostic Description:

From Boden et al. (1997).

Diagnosis. Dorsal-fin origin located behind anal-fin origin, dorsal-fin base terminating before anal-fin base. Dorsal-fin margin concave and pointed, its height the same as the length of its base. Dark band between dorsal and anal fin generally clearly visible. Lateral-line scales number 51-61, four or five, rarely three, lateralline scales on the dark coloured transversal band. Dorsal fin short, with 20-23 rays. Anal fin longer with 26-30 rays.

Description. Mouth terminal. Teeth bicuspid, five in upper jaw, six in lower jaw. Sub-mental swelling large and rounded, its beginning at its posterior end at a point below the anterior margin of the eye. Snout rounded and blunt. Anterior nostril in the middle between the tip of the snout and the anterior border of the eye. Posterior nostril at 0·25-0·33 distance from the eye. Eye diameter 38-66% of snout length. Preanal distance shorter than predorsal distance. Anal-fin base longer than dorsal. Dorsal-fin height about the same as its base. Anal-fin height less than its base. Pectoral fin twice as long as pelvic fin and reaching the pelvic-fin base. Distance between pectoral and pelvic fins as long as pelvic-fin length or a little shorter. Pelvic-fin base midway between pectoral-fin base and anal-fin origin or closer to the pectoral. Length of pelvic fin half the distance between pelvic-fin base and anal-fin origin. Compared to other species in this group, M. dundoensis has a low number of dorsal- (20-23) and anal- (26-30) fin rays, a high number of lateral-line scales (51-61) and there are 21-25 scales between dorsal- and anal-fin origins. Dark band between origin of dorsal and anal fins covered with four or five (rarely three) lateralline scales. Caudal peduncle and head darker than the rest of the body except for the dark transverse band between dorsal and anal fins. The electric organ is composed of electrocytes with non-penetrating stalks innervated on the posterior side (NPp).

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Hopkins, C.D., Boden, G., Teugels, G.G., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2107

Habitat and Ecology:

Habitat and Ecology

This is a demersal species.

Systems

  • Freshwater
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/181776

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=10890

Electric Organ Discharge:

unknown

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorSullivan, John P., Sullivan, John P., Africhthy
Sourcehttp://mormyrids.lifedesks.org/pages/2107

IUCN Red List Assessment:
Red List Category

DD
Data Deficient

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

Marcusenius dundoensis is only known from a restricted area in the Kwango and Kasai River systems, Central Congo River basin in Angola. It is may well be more widespread.
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/181776

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/181776

Threats:

Major Threats

Artisanal, but very intensively diamond mining is a very important threat in small rivers in the Kasai region. The sand from digging in the river and the river beds causes sedimentation.
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/181776
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith