You can sponsor this page

Procerusternarchus pixuna  Cox Fernandes, Nogueira & Alves-Gomes, 2014

Upload your photos and videos
Pictures | Google image
Image of Procerusternarchus pixuna
Procerusternarchus pixuna
Picture by Nogueira, A.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Gymnotiformes (Knifefishes) > Hypopomidae (Bluntnose knifefishes)
Etymology: pixuna: The specific name comes from the Nheengatu language meaning dark or black.

Environment / Climate / Range Ecology

Freshwater; benthopelagic; pH range: 3.0 - 4.5.   Tropical; 25°C - 27°C (Ref. 102656), preferred ?

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

South America: Negro River basin in Brazil.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 13.8 cm TL male/unsexed; (Ref. 102656)

Short description Morphology | Morphometrics

Anal soft rays: 175 - 242. Procerusternarchus pixuna is distinguished from species of the genera Microsternarchus and Racenisia by the following characters: apomorphic presence of a deep, semi-transparent, large myogenic electric organ located along the body above the anal fin, between the ventral margin of the hypaxial muscle and dorsal margin of the anal fin muscle (pinnalis analis externalis) (vs. electric organ is not as deep and only semi-transparent at the end of the caudal); plesiomorphic condition of a fully-scaled body, with scalation on the dorsoanterior part of the body and along the middorsum, directly behind the extrascapular on the back of the head, on the nape (vs. scales absent from anterior upper to middle back); psiomorphic condition of 10 rows of embedded scales above the lateral line (vs. 3-4 in species of Microsternarchus and 4-5 in species of Racenisia); uniformly darker body; a dark line along the area above the lateral line (vs. back and top of the head also dark and a paler brownish ventral part of the body); and oblique band/blotches on the dorsal part of the body. Other characters useful to distinguish Procerusternarchus pixuna include: slightly projecting and elongated snout, 26.0-34.6% of head (H); head depth at occiput 49.7-68.9% of H; head length 1.2-14.5%; distance from eye to posterior naris, 3.9-10.9% of H; caudal filament length 19.1-27.5% of TL; caudal filament depth 1.1-1.9% of LEA; 175-242 anal-fin rays; 11-14 pectoral-fin rays; 13-15 pleural ribs, and 2-5 modified pleural ribs in the posteroventral wall of the abdominal cavity attached loosely and next to the first haemal spine;14-17 precaudal vertebrae; and 73-76 caudal vertebrae (Ref. 102656).

Biology     Glossary (e.g. epibenthic)

Inhabits black water streams along the middle and upper reaches of the Negro River Basin where it occurs in fast flowing waters, small falls and river margins with abundant submerged vegetation. During rainy season, has been collected in tangled roots of epiphytic plants that support a diverse fish assemblage. Feeds on insect larvae and parts (Ref. 102656).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Albert, James S. | Collaborators

Cox Fernandes, C., A. Nogueira and J.A. Alves-Gomes, 2014. Procerusternarchus pixuna, a new genus and species of electric knifefish (Gymnotiformes: Hypopomidae, Microsternarchini) from the Negro River, South America. Proc. Acad. Nat. Sci. Philadelphia, 163():95-118. (Ref. 102656)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

FAO(Publication : search) | FisheriesWiki |

More information

Countries
FAO areas
Ecosystems
Occurrences
Introductions
Stocks
Ecology
Diet
Food items
Food consumption
Ration
Common names
Synonyms
Metabolism
Predators
Ecotoxicology
Reproduction
Maturity
Spawning
Fecundity
Eggs
Egg development
Age/Size
Growth
Length-weight
Length-length
Length-frequencies
Morphometrics
Morphology
Larvae
Larval dynamics
Recruitment
Abundance
References
Aquaculture
Aquaculture profile
Strains
Genetics
Allele frequencies
Heritability
Diseases
Processing
Mass conversion
Collaborators
Pictures
Stamps, Coins
Sounds
Ciguatera
Speed
Swim. type
Gill area
Otoliths
Brains
Vision

Tools

Special reports

Download XML

Internet sources