Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Siluriformes
(Catfish) > Loricariidae
(Armored catfishes) > Hypoptopomatinae
Etymology: Hisonotus: Greek, isos = equal + Greek, noton = back (Ref. 45335); iota: The species epithet iota is from the Greek meaning anything very small, referring to the small
size of the species compared to congeners. A noun in apposition. More on authors: Carvalho & Reis.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic. Tropical; 26°S - 27°S, 52°W - 53°W
South America: Brazil. Known only from the type locality in rio Chapecó, a tributary of the upper rio Uruguay basin (Ref. 80996).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 3.3 cm SL (female)
Morphology | Morphometrics
Hisonotus iota differs from its congeners, except from Hisonotus hungy, by the lower lateral plate count 20–22 (mode 21) vs. 22–29 lateral plates, and by the lower vertebral count 25–26 vs. 27–32 vertebrae. It differs from Hisonotus hungy by having an infraorbital canal entering the infraorbital series via the compound pterotic vs. infraorbital canal entering the infraorbital series via the sphenotic (Ref. 80996).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Carvalho, T.P. and R.R. Reis, 2009. Four new species of Hisonotus (Siluriformes: Loricariidae) from the upper rio Uruguay, southeastern South America, with a review of the genus in the rio Uruguay basin. Zootaxa 2113:1-40. (Ref. 80996)
IUCN Red List Status (Ref. 119314)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00550 (0.00225 - 0.01343), b=3.11 (2.90 - 3.32), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 2.3 ±0.1 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .