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); thayeri: Named for the Thayer Expedition, realized in the middle of the 19th century and considered one of the most important journeys performed in Brazil, during which the species was sampled for the first time. A genitive.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal. Tropical
South America: coastal basins of rio Paraíba do Sul, Lagoa Feia, rio Macaé, rio tabapoana, rio Itapemirim, rio Novo, rio Benevente, and rio Doce in Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 4.2 cm SL male/unsexed; (Ref. 109747)
Morphology | Morphometrics
Vertebrae: 27 - 28. Hisonotus thayeri can be distinguished from H. aky, H. brunneus, H. carreiro, H. charrua, H. heterogaster, H. laevior, H. megaloplax, H. montanus, H. nigricauda, H. notopagos, H. ringueleti, H. taimensis, and H. vireo by having the anterior portion of snout completely covered by odontodes (vs. anterior portion of snout with an odontode-free band between the dorsal and ventral series of odontodes). It can be diagnosed from H. alberti, H. depressicauda, H. depressinotus, H. francirochai, H. maculipinnis, H. packysarkos, H. paulinus, and H. prata by having the anterior portion of abdomen covered by large plates arranged in three longitudinal series without naked spaces between them (vs. abdominal plates , when present, not arranged in three longitudinal series, or when arranged with naked spaces between the lateral and median series). It can be differentiated from H. acuen, H. bockmanni, H. chromodontus, and H. vespuccii by having an ovoid to rectangular spinelet (vs. spinelet V-shaped, with lateral projections anteriorly directed). It is distinguished from H. iota and H. leucophrys by the lack of well-developed odontodes at the posterior tip of supraoccipital (vs. presence). It is distinct from H. armatus and H. hungy by having 28 vertebrae (vs. 25-26 in H. hungy and 29 in H. armatus). It is distinguished from H. leucofrenatus by having the clear longitudinal stripe of head ending near the vertical through distal tip of opercle (vs. clear longitudinal stripe longer, bifurcating at the tip of compound pterotic and running parallel to each other; the inferior stripe over the canals of the lateral line, reaching the vertical through the middle of dorsal-fin base); bifid neural spine of seventh vertebra present, dorsolaterally projected (vs. bifid neural spine absent); and basipterygia contacting along midline until anterior margin (vs. anterior portion of basipterygia with halves apart from each other). It differs from H. notatus by its generally continuous mid-dorsal series of plates, with a total of 15-18 plates (mode 17), rarely with one plate lacking in the middle of the series (vs. mid-dorsal series generally interrupted, with 4-13 plates present, and 5-8 lacking plates in the middle of the series) (Ref. 109747).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Martins, F.O. and F. Langeani, 2016. Redescription of Hisonotus notatus Eigenmann & Eigenmann, 1889 (Loricariidae: Hypoptopomatinae), the type species of the genus, and description of a new species from coastal drainages of southern Brazil. Neotrop. Ichthyol. 14(2):1-18. (Ref. 109747)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00537 (0.00221 - 0.01307), 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
): 2.1 ±0.1 se; Based on size and trophs of closest relatives
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .