Overview

Comprehensive Description

Biology

Maximum size 70 mm SL (Ref. 80290).
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Nannopetersius ansorgii -

BMNH 1910.11.28: 71-80, paralectotypes, 4;

  • Melanie L. J. Stiassny, Victor Mamonekene (2007): Micralestes (Characiformes, Alestidae) of the lower Congo River, with a description of a new species endemic to the lower Congo River rapids in the Democratic Republic of Congo. Zootaxa 1614, 17-29: 19-19, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:EFFDCA90-CD71-40DA-B0D1-5E2030D2D945
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Distribution

Range Description

This species is native to Gabon, Democratic Republic of the Congo, Guinea Equatorial, and Angola. The record from Matadi from the Lower Congo and the type locality in Angola are doubtful though.

Central Africa: It is known from the Benito, Chiloango, Kouilou, Loeme and Ogowe Rivers and from Equatorial Guinea. Elsewhere, it is known from the Bengo and Congo from Congo to Angola.

Southern Africa: In Angola, the species occurs in Bengo River (Lake Kilunda, Lake Rumango), Chiloango River (Loango, Lukula and Luali Rivers, and Lake Chiloango) systems.
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Africa: Benito (Mbini), Chiloango, Kouilou, Loeme and Ogooué rivers of Gabon and Equatorial Guinea, and the Bengo and Congo River basins of Angola and Democratic Republic of the Congo (Ref. 80290).
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Western and central Africa.
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Physical Description

Morphology

Anal spines: 0; Analsoft rays: 21 - 25
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Size

Max. size

7.5 cm TL (male/unsexed; (Ref. 2059))
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Diagnostic Description

Diagnosis: 14-17 gill rakers on lower limb of first arch; flanks with lateral pigment band, more or less restricted to posterior third of trunk and caudal fin base, extending onto median caudal fin rays; dorsal and ventral caudal fin lobes not pigmented (Ref. 80290). Description: body relatively robust, body depth 35-40% of SL and head length 25-28% of SL; mouth terminal to slightly superior, lower jaw prominent, its depth about 1.5x that of upper jaw; premaxilla with 2 teeth in outer row each bearing 3-5 cusps, 4 teeth in inner row each bearing 5-7 cusps; dentary with 4 teeth in outer row each bearing 5-7 cusps, a monocuspid inner dentary tooth present posterior to outer row teeth; lateral line canal complete, 32-35 tubes, ultimate canal-bearing scale contacting caudal fin rays by 1-2 non-canal-bearing scales; anal fin with 3 unbranched and 19-22 branched rays (Ref. 80290). Coloration: flanks silvery, with dark lateral pigment band more or less restricted to posterior third of trunk and caudal fin base, extending onto median caudal fin rays; band especially prominent at caudal fin base and on medial fin rays, yielding a strong diamond-shaped mark; dark humeral spot present; opercle with dark diffuse pigment; fins generally yellowish to dusky, margins trimmed in dark pigment (Ref. 80290).
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BMNH 1910.11.28: 71-80, paralectotypes, 4;

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Melanie L. J. Stiassny

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Type Information

Cotype for Phenacogrammus ansorgii
Catalog Number: USNM 86614
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Locality: Bugor. At Cabero, Africa (Bengor. Atcabiri, Angola), Angola, Africa
  • Cotype:
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Nannopetersius ansorgii is a pelagic species.

Systems
  • Freshwater
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Environment

pelagic; freshwater; pH range: 6.5; dH range: 12
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Nannopetersius ansorgii

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Statistics of barcoding coverage: Nannopetersius ansorgii

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

Conservation Status

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
Snoeks, J., Tweddle, D., Getahun, A., Lalèyè, P., Paugy, D., Zaiss, R., Fishar, M.R.A & Brooks, E.

Contributor/s

Justification
This species has a wide distribution, with no known major widespread threats. It is therefore listed as Least Concern. It has also been assessed regionally as Least Concern for central and southern Africa.
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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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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
No information available.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries:
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