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Siluriformes (Catfishes) >
Trichomycteridae (Pencil or parasitic catfishes) > Trichomycterinae
Etymology: Trichomycterus: Greek, thrix = hair + Greek, mykter, -eros = nose (Ref. 45335); giganteus: Derived from the Latin giganteus (gigantic), referring to its large size, the biggest among species from southeastern Brazil.
More on authors: Lima & Costa.
Environnement : milieu / zone climatique / profondeur / gamme de distribution
Écologie
; eau douce démersal. Tropical
South America: Upper Rio Guandu basin in southeastern Brazil.
Taille / Poids / Âge
Maturité: Lm ? range ? - ? cm
Max length : 20.4 cm SL mâle / non sexé; (Ref. 54465)
Description synthétique
Clés d'identification | Morphologie | Morphométrie
Rayons mous dorsaux (Total) : 12 - 13; Rayons mous anaux: 10 - 11; Vertèbres: 36 - 37. Distinguishable from the other species of the genus by having a broad dark bluish gray stripe along lateral midline of body, restricted to inner layer of tegument, overlapped by superficial dark brown spots. Also distinguished from the remaining species of the southeastern Brazil by having nine pectoral-fin rays, high number of odontodes (interopercular 59-70 vs. 30-52, opercular 23-30 vs. 10-20), anal-fin origin at vertical posterior to dorsal-fin base and a dark gray opercular patch of odontodes vs. light yellow . Differs from T. nigricans and T. immaculatus by a combination of longer nasal and maxillary barbels (nasal reaching pectoral fin base, vs. between orbit and opercular patch of odontodes; maxillary reaching anterior third of pectoral fin, vs. to interopercular patch of odontodes) and a single median third supraorbital pore vs. third supraorbital pore paired (Ref. 54465).
Although the type locality is a clear water stream with strong current, all specimens were found in still water between 50 and 200 cm deep, hidden under rocks (Ref. 54465).
Cycle de vie et comportement reproducteur
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Lima, S.M.Q. and W.J.E.M. Costa, 2004. Trichomycterus giganteus (Siluriformes: Loricarioidea: Trichomycteridae): a new catfish from the Rio Guandu basin, southeastern Brazil. Zootaxa 761:1-6. (Ref. 54465)
Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2025-2 (Global))
Menace pour l'homme
Harmless
Utilisations par l'homme
Pêcheries: sans intérêt
Outils
Articles particuliers
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Sources Internet
Estimations basées sur des modèles
Indice de diversité phylogénétique (Réf.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00912 (0.00396 - 0.02102), b=2.97 (2.79 - 3.15), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Niveau trophique (Réf.
69278): 3.3 ±0.4 se; based on size and trophs of closest relatives
Résilience (Réf.
120179): Faible, temps minimum de doublement de population : 4,5 à 14 années (Assuming Fec < 100).
Vulnérabilité de la pêche (Ref.
59153): Low vulnerability (15 of 100).
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