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Trichomycterus perkos  Datovo, Carvalho & Ferrer, 2012

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

Actinopterygii (ray-finned fishes) > Siluriformes (Catfish) > 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 / Climate / Range Ecology

Freshwater; demersal.   Tropical

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

South America: tributaries of the Paranapanema and Uruguai River basins in southern Brazil.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm

Short description Morphology | Morphometrics

Dorsal spines (total): 2; Dorsal soft rays (total): 8-9; Anal spines: 2; Anal soft rays: 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).

Biology     Glossary (e.g. epibenthic)

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 Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Pinna, Mário de | Collaborators

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. 115185)

CITES (Ref. 108899)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries:
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BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | ECOTOX | Faunafri | Fishes of Iran | Fishtrace | GenBank(genome, nucleotide) | GloBI | GOBASE | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Scirus | SeaLifeBase | Tree of Life | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoobank | Zoological Record

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=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm Total Length, based on all LWR estimates for this body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.2   ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278):  .
Vulnerability (Ref. 59153):  Low vulnerability (10 of 100) .