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Astyanax courensis  Bertaco, Carvalho & Jerep, 2010

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

Actinopterygii (ray-finned fishes) > Characiformes (Characins) > Characidae (Characins) > Incertae sedis
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mithology (Ref. 45335);  courensis: Named for its type locality, rio dos Couros, an important tributary of rio Tocantinzinho, upper rio Tocantins basin; adjective.

Environment / Climate / Range Ecology

Freshwater; pelagic; depth range ? - 2 m (Ref. 84461).   Tropical; 14°S - 15°S, 47°W - 48°W

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

South America: known from the rio dos Couros basin, tributary of rio Tocantinzinho, upper rio Tocantins basin, Alto Paraíso de Goiás, Chapada dos Veadeiros, Goiás State, Brazil (Ref. 84461).

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 7.2 cm SL male/unsexed; (Ref. 84461)

Short description Morphology | Morphometrics

Astyanax courensis belongs to the A. scabripinnis species complex and is distinguished from other species of this complex by the number of scale rows between lateral line and pelvic fin origin (3-4 vs. 5-6), except from A. brachypterygium, A. burgerai Zanata & Camelier, A. goyanensis, A. intermedius Eigenmann, A. jenynsii, A. microschemos, A. rivularis Lütken, A. totae, and A. varzeae. It differs from A. brachypterygium, A. goyanensis, and A. totae by head length (24.9-28.2% SL, mean = 26.6 vs. 27.8-33.2, mean = 29.9, 27.7-32.3, mean = 31.6, and 27.9-32.8, mean = 29.7, respectively), and by the number of humeral spots (1 vs. 2, except in A. totae, which has one). It differs from A. burgerai and A. intermedius by shape of the dentary teeth (abruptly decreasing in size after fourth tooth vs. teeth gradually decreasing in size posteriorly), and orbital diameter (24.9-31.9% HL, mean = 27.9 vs. 34.6-40.6, mean = 38.0, 32.5-47.8, mean = 39.0, respectively); from A. jenynsii by the number of branched anal-fin rays (15-17, mean = 15.8 vs. 13-15, mean =14) and upper jaw length (40.6-50.0% HL, mean = 44.9 vs. 35.9-39.5, mean = 37.4); from A. rivularis by body depth (27.4-33.1% SL, mean = 30.5 vs. 35.0-46.0, mean = 40.3), and by the number of humeral spots (1 vs. 2); from A. varzeae by the number of lateral line scales (35-36, mean = 35.4 vs. 37-42, mean = 39), caudal-peduncle length (13.6-16.9% SL, mean =15.2 vs. 10.5-13.9, mean = 12.4) and orbital diameter (24.9-31.9% HL, mean = 27.9 vs. 30.9-44.5, mean = 37.9). Furthermore, it differs from A. microschemos and A. totae by the number of maxillary teeth (1 vs. 2-3 and 2-5, respectively). Astyanax courensis differs from only sympatric Astyanax species, A. goyanensis, by the number of pelvic-fin rays (8 vs. 7), and number of maxillary teeth (1 vs. 2-5), and by prepectoral distance (23.7-27.8% SL, mean = 26.4 vs. 27.7-32.0, mean = 30.4) (Ref. 84461).

Biology     Glossary (e.g. epibenthic)

The collection locality is around 1135 m above sea level, rio dos Couros in that point has moderate riparian vegetation and it is typically between 10 and 15 m wide, and 1.5 m deep. Although presenting some rapids, the water is clear, the substrate has stones, rocks, and some stretches with mud. Most of the specimens were collected on the stretch downstream from the waterfall, a few specimens on the stretch upstream of waterfall. Only 4 species were collected syntopically with A. courensis: Characidium stigmosum, C. aff. zebra, Gymnotocinclus anosteos and Trichomycterus sp. The stomach contents of five specimens consisted of Plecoptera, Trichoptera, Chironomidae (Diptera), authochthonous and allochthonous insects, and digested vegetal organic matter; these stomachs were partially full (Ref. 84461).

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

Main reference Upload your references | References | Coordinator | Collaborators

Bertaco, V.A., F.R. Carvalho and F.C. Jerep, 2010. Astyanax goyanensis (Miranda-Ribeiro, 1944), new combination and Astyanax courensis, new species (Ostariophysi: Characiformes): two Characidae from the upper rio Tocantins basin, Central Brazil. Neotrop. Ichthyol. 8(2):265-275. (Ref. 84461)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01862 (0.00808 - 0.04291), b=3.03 (2.85 - 3.21), in cm Total Length, based on LWR estimates for this Genus-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  2.8   ±0.3 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278):  High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153):  Low vulnerability (10 of 100) .