Overview

Comprehensive Description

Biology

Its electric organ discharge (EOD) is steroid-sensitive (Ref. 10765; 10764). A mature male was reported to have an EOD waveform twice as long as that of two mature females (Ref. 10764).
  • Hopkins, C.D., S. Lavoué and J.P. Sullivan 2007 Mormyridae. p. 219-334. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81635)   http://www.fishbase.org/references/FBRefSummary.php?id=81635&speccode=10825 External link.
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General Description

Moderate-sized Paramormyrops, with a rounded head, short and thick caudal peduncle with 16 circumpeduncular scales. The length of caudal peduncle is less than 20.1% SL. The lateral line has 67–70 scales. Head blunt and U-shaped when viewed from above; head angle 27°, snout angle 53–63°. Depth of the body equal to the length of the head, 20–22% SL. Head length 22–23% SL. Snout rounded, 5.7–6.6% SL, mouth small, subterminal, five notched teeth in upper jaw, six in lower. Nostrils circular, mid-way between border of eye and tip of snout. Dorsal fin with 16–17 rays; anal with 22–23; pectoral fin 13–14% SL, not reaching pelvic fins. Caudal peduncle thick, 2.5–2.7 times as long as deep. The electric organ has electrocytes with penetrating stalks with anterior innervation (Type Pa) in which the stalk penetrations are large.

Color: a uniform dark brown overall, somewhat lighter on underside.

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Distribution

Range Description

The type locality is in South Cameroon where two specimens were collected by George Latimer Bates, 1863-1940, an American naturalist and ornithologist who lived in Southern Cameroon during the first decade of the 20th Century and supplied many fish and reptile and amphibian specimens from this region to G.A. Boulenger at the British Museum. The type locality for Marcusenius batesii and several other species first collected by Bates is “Efulen.” Although several localities in Southern Cameroon today bear the name "Efoulan." The Efulen (now Efoulan) of Bates is located in the upper Kienké River basin (then called the Kribi River), near present-day Akom II at 2°46'59"N, 10°31'59"E (Fig. 12.89). Tentative identifications of museum specimens shows a wide distribution in Cameroon, including the Sanaga River basin, the Kienké River, parts of the Ogowe River basin of Gabon, and the Kouilou River basin of Congo. Some of the specimens mapped here may represent new taxa.
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Africa: a wide distribution in Cameroon, Gabon and Republic of Congo, but some specimens may represent new taxa (Ref. 81635).
  • Hopkins, C.D., S. Lavoué and J.P. Sullivan 2007 Mormyridae. p. 219-334. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81635)   http://www.fishbase.org/references/FBRefSummary.php?id=81635&speccode=10825 External link.
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West-central Africa.
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 16 - 17; Analspines: 0; Analsoft rays: 22 - 23
  • Hopkins, C.D., S. Lavoué and J.P. Sullivan 2007 Mormyridae. p. 219-334. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81635)   http://www.fishbase.org/references/FBRefSummary.php?id=81635&speccode=10825 External link.
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Size

Max. size

15.2 cm TL (male/unsexed; (Ref. 81635))
  • Hopkins, C.D., S. Lavoué and J.P. Sullivan 2007 Mormyridae. p. 219-334. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81635)   http://www.fishbase.org/references/FBRefSummary.php?id=81635&speccode=10825 External link.
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to 152 mm SL.

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Diagnostic Description

A moderate-sized Paramormyrops (Ref. 81635). Head rounded, blunt; snout is U-shaped from above (Ref. 81635). The species has a uniform dark brown colour overall, somewhat lighter on the underside (Ref. 81635).
  • Hopkins, C.D., S. Lavoué and J.P. Sullivan 2007 Mormyridae. p. 219-334. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81635)   http://www.fishbase.org/references/FBRefSummary.php?id=81635&speccode=10825 External link.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Paramormyops batesii is a demersal species. Its electric organ discharge (EOD) is steroid-sensitive (Bass and Hopkins 1985; Landsman 1995). A mature male was reported to have an EOD waveform twice as long as that of two mature females (Landsman 1995).

Systems
  • Freshwater
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Environment

demersal; freshwater
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Life History and Behavior

Behavior

Electric Organ Discharge

EOD unknown. The electric organ has electrocytes with penetrating stalks with anterior innervation (Type Pa) in which the stalk penetrations are large. From the anatomy one would expect this species to have a triphasic discharge with a significant initial head-negative phase, P0, to the waveform.

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Conservation

Conservation Status

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
The distribution of Paramormyrops batesii is unclear, more information is needed on the species distribution before a full Red List assessment can be made.
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Population

Population
No information available.

Population Trend
Unknown
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Threats

Major Threats
There is no information available on threats to this species.
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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions
None known.
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