Overview

Comprehensive Description

Biology

Found in clear water streams, running over sand and silt bottoms. Inhabits slow to moderate water current, less than 1m deep. Feeds on aquatic insects (caddisflies larvae, chironomids pupae and Odonata nymph) and arthropods (Ref. 100733).
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Distribution

South America: Guyana and Venezuela (?).
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Guyana and Venezuela (?)
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Physical Description

Morphology

Analsoft rays: 21 - 25
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Size

Max. size

6.0 cm TL (male/unsexed; (Ref. 38376))
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Diagnostic Description

Distinguished by having laterally compressed body, moderately elongate; greatest body depth at origin of dorsal fin; dorsal profile of head convex from tip of snout to vertical through anterior border of anterior nostril and straight from that point to tip of supraoccipital spine; dorsal profile of body straight to slightly convex at predorsal region, straight at dorsal-fin base, straight from end of dorsal-fin base to adipose-fin origin and concave along caudal peduncle; presence of middle caudal -fin rays hyaline; five, rarely six horizontal scale row above lateral line and the absence of a midlateral line series of dark anteriorly-directed chevrons (Ref. 100733).
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Type Information

Paratype for Astyanax guianensis Eigenmann
Catalog Number: USNM 66106
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Eigenmann
Year Collected: 1908
Locality: Tumatumari, British Giuana, Guyana, South America
  • Paratype: Eigenmann, C. H. 1909. Annals of the Carnegie Museum. 6 (1): 16.
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Paratype for Astyanax guianensis Eigenmann
Catalog Number: USNM 66105
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Eigenmann
Year Collected: 1908
Locality: Rockstone, British Guiana, Guyana, South America
  • Paratype: Eigenmann, C. H. 1909. Annals of the Carnegie Museum. 6 (1): 16.
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Paratype for Astyanax guianensis Eigenmann
Catalog Number: USNM 120394
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): C. Eigenmann
Year Collected: 1908
Locality: Brit. Guiana, Rockstone, Guyana, South America
  • Paratype: Eigenmann, C. H. 1909. Annals of the Carnegie Museum. 6 (1): 16.
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Ecology

Habitat

Environment

benthopelagic; freshwater; pH range: 5.8 - 7.5; dH range: 8 - 20
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Conservation

Threats

Not Evaluated
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