Classification / Names
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Siluriformes (Catfishes) >
Trichomycteridae (Pencil or parasitic catfishes) > Trichomycterinae
Etymology: Trichomycterus: Greek, thrix = hair + Greek, mykter, -eros = nose (Ref. 45335); perkos: From the Greek adjective perkos (pe????), meaning “s spotted or streaked with black marks, in allusion to the color pattern of the new species formed by either dark stripes (small-sized specimens) or dark stripes combined with small spots (larger individuals).
Environment: milieu / climate zone / depth range / distribution range
Ecologia
; acqua dolce demersale. Tropical
South America: tributaries of the Paranapanema and Uruguai River basins in southern Brazil.
Size / Peso / Age
Maturity: Lm ? range ? - ? cm
Max length : 9.4 cm SL maschio/sesso non determinato; (Ref. 90267)
Short description
Chiavi di identificazione | Morfologia | Morfometria
Spine dorsali (totale) : 2; Raggi dorsali molli (totale) : 8 - 9; Spine anali: 2; Raggi anali molli: 6 - 8. Large specimens of more than 65.8 mm SL, presumably adults, of Trichomycterus perkos can be diagnosed from all their congeners in having a remarkable coloration with melanophores arranged in two distinct skin layers, forming (1) a freckled pattern, with minute light brown spots scattered on the superficial tegumentar layer of the dorsum and caudal peduncle, and (2) a striped pattern, with three- sagittal, midlateral, and ventrolateral - wide, irregularly bordered, and sometimes interrupted dark brown stripes running along an inner skin layer of the trunk and caudal peduncle . Smaller specimens of less than 43.3 mm SL, presumably juveniles, of Trichomycterus perkos lack the superficial freckled pattern, but already exhibit the three wide dark stripes found in the adults.
Nevertheless, both juveniles and adults of T. perkos possess the following unequivocally morphological traits that distinguish them from other congeners: from T. duellmani in having modally seven pectoral-fin rays (vs. modally eight), two pores in the lateral line (vs. four), distal margin of the adpressed pelvic fin not reaching the anus (vs. distal margin extending posteriorly beyond the anus), modally ten branchiostegal rays (vs. six or seven), and modally 41 post-Weberian vertebrae (vs. 33-36); (2) from T. itatiayae by the first pectoral-fin ray not filamentous (vs. filamentous), distal margin of the adpressed pelvic fin not reaching the anus (vs. distal margin extending posteriorly beyond the anus), modally ten branchiostegal rays (vs. eight), and modally 41 post-Weberian vertebrae (vs. 35-37); (3) from T. nigroauratus by the first pectoral-fin ray not filamentous (vs. filamentous), modally seven pectoral-fin rays (vs. modally eight), modally ten branchiostegal rays (vs. seven or eight), and modally 41 post-Weberian vertebrae (vs. 35-36); (4) from T. pauciradiatus in having the first pectoral-fin ray not filamentous (vs. filamentous), modally seven pectoral- fin rays (vs. modally six), five pelvic-fin rays (vs. four), distal margin of the adpressed pelvic fin not reaching the anus (vs. distal margin extending posteriorly beyond the anus), pores i1 and i3 of the infraorbital laterosensory canal lacking (vs. i1 and i3 present), modally ten branchiostegal rays (vs. eight), and modally 41 post-Weberian vertebrae (vs. 36-38); (5) from T. reinhardti by the first pectoral-fin ray not prolonged as a filament (vs. ray filamentous), distal margin of the adpressed pelvic fin not reaching the anus (vs. distal margin extending posteriorly beyond the anus), absence of the pores i1 and i3 of the infraorbital laterosensory canal (vs. i1 and i3 present), modally ten branchiostegal rays (vs. seven or eight), and modally 41 post-Weberian vertebrae (vs. 38); and (6) from T. taenia by the first pectoral-fin ray not filamentous (vs. filamentous), and distal margin of the adpressed pelvic fin not reaching the anus (vs. distal margin reaching the anus) (Ref. 90267).
Mostly found in clear water streams with 1 to 3 m wide, with bottoms composed of stone, gravel, and sand. Streamlets are usually surrounded by modified riparian vegetation (Ref. 90267).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Datovo, A., M. Carvalho and J. Ferrer, 2012. A new species of the catfish genus Trichomycterus from the La Plata River basin, southern Brazil, with comments on its putative phylogenetic position (Siluriformes: Trichomycteridae). Zootaxa 3327:33-44. (Ref. 90267)
IUCN Red List Status (Ref. 130435: Version 2024-2)
Threat to humans
Harmless
Human uses
Strumenti
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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=0.00851 (0.00358 - 0.02025), b=2.93 (2.74 - 3.12), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
