Overview

Comprehensive Description

Description générale

après Pellegrin 1924, pp. 5-6.

La hauteur du corps est contenue 4 fois 1/4 à 4 fois 3/4 dans la longueur, sans la caudale, la longueur de la tête 3 fois 1/2 à 3 fois 3/4. La tête est environ 1 fois 2./3 aussi longue que haute. Le museau, dirigé en avant et prolongé en pointe, est légèrement plus court que la région postoculaire de la tête. Le grand diamètre de l'œil est compris 2 fois 1/2 à 3 fois dans la longueur du museau, 1 fois 1/2 à 2 fois dans l’espace interorbitaire, 6 fois 2/3 à 7 fois 1/2 dans la longueur de la tête. La bouche, nettement terminale, s'ouvre au niveau du bord inférieur de l'œil; elle est très étroite et garnie de 4 ou 5 petites dents bicuspides en haut, de 6 ou 7 en bas. Le menton est prolongé en un long appendice pointu, dirigé en avant, égalant la longueur du museau. On compte 65 à 69 écailles le long de la ligne latérale, 12-13 / 14-16 en ligne transversale, 9-11 / 9-11 entre l’origine de la dorsale et celle de l’anale, 12 autour du pédicule caudal. La dorsale, de 26 ou 27 rayons, débute au-dessus du 6e ou 7e rayon de l’anale; la longueur de sa base fait environs la moitié de sa distance à la tête et égale ou est un peu supérieure à sa distance de la caudale. L’anale, de 32 au 33 rayons, est légèrement plus rapprochée de l’origine de la caudale que de celle de la ventrale. La pectorale, obtusément pointue, fait les 3/5 de la longueur de la tête; le double environ de la ventrale, dont elle atteint de la 1/2 aux 3/4 de la longueur. Le pédicule caudal est 3 fois environ aussi long que haut. La caudale, écailleuse à sa base, a ses lobes pointus. La coloration est brun jaunâtre avec des traces peu distinctes d’une bande noire allant du début de la dorsale à celui de l’anale. Les nageoires sont brunâtres. D. 26-27; A. 32-33; P. 11; V. 6; Sq. 12-13/65-69/14-16.

Trois spécimens de Kamaiembi (Kasaï) (Dr. SCHOUTEDEN). Longueur totale: 81+12=93, 95+ 15=110, 110+20=130 millim.

Ce curieux Poisson à museau prolongé, presque droit, un peu plus court que la région postoculaire et qui rappelle vaguement, barbillon à part, la tête de l’Echidné, se rapproche quelque peu du Gnathonemus longibarbis HILGENDORF, du lac Victoria. On l’en distingue toutefois facilement à cause de son museau plus long et grêle, ses nageoires dorsale et anale plus courtes.

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General Description

after Pellegrin 1924, pp. 5-6.

The height of the body is contained 4 1/4 to 4 3/4 times in length, excluding caudal, the length of the head 3 1/2 to 3 3/4 times. The head is about 1 2/3 times as long as high. The snout, directed forward and pointed, is slightly shorter than postocular region of head. The large diameter of the eye is included 2 1/2 to 3 times in snout length, 1 1/2 to 2 times in the interorbital space, 6 2/3 to 7 1/2 times in head length. Mouth, terminal, opens at the lower edge of the eye and is very narrow and filled with 4 or 5 small bicuspid teeth above, 6 or 7 below. The chin is extended into a long pointed appendage, directed forward, matching the length of the snout. There are 65-69 scales along the lateral line, 12-13 / 14-16 in transverse line, 9-11 / 9-11 between dorsal and anal, 12 around the caudal peduncle . Dorsal rays 26 or 27, starting above the 6th or 7th ray of anal; length of its base is about half the distance to the head and is equal to or slightly greater than its distance from the caudal. Anal 32 to 33, slightly closer to the origin of caudal fin than that of the ventral. Pectoral, obtusely pointed, 3/5 of head length; about twice the ventral, which it reaches by 1/2 to 3/4 of its length. The caudal peduncle is about 3 times as long as high. The tail, scaly at the base, with its pointed lobes. The color is yellowish brown with indistinct traces of a black stripe running from the beginning of the dorsal to that of anal. The fins are brownish. D. 26-27; A. 32-33; P. 11; V. 6; Scales 12-13/65-69/14-16

This curious fish with its snout extended almost straight, slightly shorter than postocular region which is vaguely reminiscent, chin barbel excluded, of the head of the Echidna, resembles somewhat Gnathonemus longibarbis Hilgendorf, of Lake Victoria. However, it is distinguished easily by its longer and more slender snout and its shorter dorsal and anal fins.

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Distribution

Range Description

Gnathonemus echidnorhynchus is known from the Central Congo River basin. It is probably present in Pool Malebo (Stanley Pool).
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Africa: middle Congo River basin (Ref. 4910, 41590).
  • Gosse, J.-P. 1984 Mormyridae. p. 63-122. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3203)
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Widespread in Congo and Kasai basins. See Fishbase for museum records and localities.

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Africa.
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Physical Description

Size

Max. size

11.0 cm SL (male/unsexed; (Ref. 42477))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This is a demersal species.

Systems
  • Freshwater
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Environment

demersal; freshwater
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Above Ubundu, Province Orientale, D.R. Congo, this species was collected by cast net along the grassy margin of the Congo River just below the outlet of the Ruiki River. This species was not collected in the main Congo channel or elswhere nearby. The Ruiki is a black water river and it is possible this species prefers black water.

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Life History and Behavior

Behavior

Electric Organ Discharge

The EOD waveform is between 0.4-0.5 millesconds in duration. There is a relatively weak head-negative pre-pulse followed by a broad positive (P1) phase and a shorter negative (P2) phase.

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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
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.
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Population

Population
No information available.

Population Trend
Unknown
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Threats

Major Threats
None known.
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Least Concern (LC)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
None known.
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