Classification / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Stethaprioninae
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mythology (Ref. 45335); eremus: From the Latin adjective eremus, meaning alone or uninhabited, in allusion to the absence of other fish species in the type locality.
Eponymy: Astyanax was the son of Hector in Greek mythology. See Homer’s Iliad for details. The reasoning for its use for a genus of characins is not explained. (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
Écologie
; eau douce benthopélagique. Tropical
South America: Rio Canivete, upper rio Iguaçu, rio Paraná drainage in Brazil.
Length at first maturity / Taille / Poids / Âge
Maturity: Lm 7.4, range 7 - 7.69 cm
Max length : 10.0 cm SL mâle / non sexé; (Ref. 96865)
Description synthétique
Clés d'identification | Morphologie | Morphométrie
Rayons mous dorsaux (Total) : 11; Vertèbres: 38. Astyanax eremus belongs to A. scabripinnis species complex . It differs from all members of this species complex by having a subterminal mouth in specimens larger than 4.82 cm SL (vs. mouth terminal in all species). It is further distinguished from all species from this complex, except A. guaricana, A. gymnogenys, A. laticeps, A. obscurus, A. paranae, A. pirabitira A. scabripinnis, A. serratus, and A. varzeae by having 39-41 lateral line scales (vs. 31-38). It can be diagnosed from A. gymnogenys A. laticeps, A. obscurus, A. scabripinnis and A. serratus by its shallower body depth (27.3-31.3% vs. 35.7-39.0%, 35.3-40.6%, 31.6-40.8%, 33% and 34.2-39.7% of SL, respectively). It differs from A. paranae by its longer snout length (21.8-26.8% vs. 16.0-20.4% of HL); from A. guaricana by its shorter interorbital width (23.5-28.4% vs. 32.7-40.9% of HL) and shorter head length (27.1-32.5% vs. 23.9-26.6% of SL); from A. varzeae by its shorter interorbital width (23.5-28.4% vs. 29.8-37.7% of HL), by relatively shorter caudal peduncle length (13.3-16.3%, modally 14.9%, vs. 10.5- 13.9%, modally 12.4%, of SL) and relatively longer snout length (21.8-26.8%, modally 24.5%, vs. 16.4-23.3%, modally 20.1%, of HL); from A. pirabitira by having four to five cusps on the second to fourth tooth in the inner premaxillary series (vs. seven cusps). It can be distinguished from A. burgerai, A. intermedius, A. jacobinae, A. leonidas, A. microschemos, A. ojiara, A. turmalinensis, A. laticeps, A. obscurus, A. pirapuan, A. rivularis, A. serratus, and A. troya by the shape of humeral spot (straight, very narrow and height, occupying two or two and a half scales wide and about six scales height, vs. wide and short with curved or rounded portions, occupying three or more scales wide and less than six scales height in the former seven species and with upper portion wide and something rounded with a vertical projection in A. laticeps, A. obscurus, A. pirapuan, A. serratus, and A. troya) (Ref. 96865).
Occurs in Rio Canivete that runs through a grove of about 1,000 m long and 150 m wide, where the sampling point is located. The sample site was located within the grove with about 0.5-1.0 m depth and about 5 m width, lentic transparent water and sandy and clay bottom variably covered by fallen trees, branches and leaves (Ref. 96865).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Ingenito, L.F.S. and L.F. Duboc, 2014. A new species of Astyanax (Ostariophysi: Characiformes: Characidae) from the upper rio Iguaçu basin, southern Brazil. Neotrop. Ichthyol. 12(2):281-290. (Ref. 96865)
Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2024-2)
Menace pour l'homme
Harmless
Utilisations par l'homme
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01096 (0.00493 - 0.02437), b=3.10 (2.93 - 3.27), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 2.8 ±0.4 se; based on size and trophs of closest relatives
Résilience (Ref.
120179): Haut, temps minimum de doublement de population inférieur à 15 mois (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
