Overview

Distribution

Range Description

This species inhabit high-gradient streams of the Amazon basin at the eastern slope of the Andean cordillera in Peru.
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Upper Amazon River basin, Peru.
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South America: upper Amazon River basin.
  • Lima, F.C.T., L.R. Malabarba, P.A. Buckup, J.F. Pezzi da Silva, R.P. Vari, A. Harold, R. Benine, O.T. Oyakawa, C.S. Pavanelli, N.A. Menezes, C.A.S. Lucena, M.C.S.L. Malabarba, Z.M.S. Lucena, R.E. Reis, F. Langeani, C. Moreira et al. … 2003 Genera Incertae Sedis in Characidae. p. 106-168. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 38376)   http://www.fishbase.org/references/FBRefSummary.php?id=38376&speccode=10622 External link.
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Physical Description

Morphology

Dorsal soft rays (total): 8; Analsoft rays: 7; Vertebrae: 40
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Size

Max. size

6.5 cm SL (male/unsexed; (Ref. 38376))
  • Lima, F.C.T., L.R. Malabarba, P.A. Buckup, J.F. Pezzi da Silva, R.P. Vari, A. Harold, R. Benine, O.T. Oyakawa, C.S. Pavanelli, N.A. Menezes, C.A.S. Lucena, M.C.S.L. Malabarba, Z.M.S. Lucena, R.E. Reis, F. Langeani, C. Moreira et al. … 2003 Genera Incertae Sedis in Characidae. p. 106-168. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 38376)   http://www.fishbase.org/references/FBRefSummary.php?id=38376&speccode=10622 External link.
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Diagnostic Description

This species is readily distinguished from its congeners, except H. beni, by the number of branched anal-fin rays (17 vs. 18-34). It differs from H. beni by the number of lateral line scales (39 vs. 44-53), and by the number of scale rows above and below lateral line (6 and 5 vs. 7-8 and 6-8, respectively); from H. helleri and H. mikrostiktos which have lower branched anal-fin rays (19-23 and 18-21), H. tridens differs by the number of lateral line scales (39 vs. 40-42 and 42-45, respectively) (Ref. 85819).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
H. tridens is a benthopelagic (ecological region at the lowest level of water body) species. Occurs in high altitude fast flowing streams in the Andean slope of the headwaters of the Amazon.

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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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
2009

Assessor/s
Reis, R & Lima, F.

Reviewer/s
Collen, B., Darwall, W., Ram, M. & Smith, K. (SRLI Freshwater Fish Evaluation Workshop)

Contributor/s

Justification
Assessed as Least Concern because this species, and its range area are not threatened.
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Population

Population
This species has a stable population trend at present.

Population Trend
Stable
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Threats

Major Threats
There are no major threats to this species. The upper portions of the river valleys are developed with plantations but these have been present for many hundreds of years. The lower portions are still well forested.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are no conservation measures in place and research into the taxonomic issues are required.
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Relevance to Humans and Ecosystems

Benefits

Importance

aquarium: commercial
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