Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Actinopteri (ray-finned fishes) > Gymnotiformes
(Knifefishes) > Sternopygidae
Etymology: Archolaemus: Greek, archo = anus + Greek, laimos = throat (Ref. 45335); santosi: Named for Geraldo Mendes dos Santos of the Instituto Nacional de Pesquisas da Amazônia, the collector of the type series, in recognition of his many contributions to our knowledge of the Amazonian fish fauna..
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic. Tropical
South America: Rio Jamari, Amazon basin, Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 21.2 cm TL male/unsexed; (Ref. 93148)
Morphology | Morphometrics
soft rays: 204 - 221. Distinguished from other congeners by having the following combination of characters: the rictus falling short of the vertical through the posterior border of the posterior naris; depth of the caudal filament 6.7-9.1% CL; length of the caudal filament 14.4- 27.0% LEA; anteroposterior length of premaxilla equal to the transverse width; length of the posterior ceratohyal approximately the same length as the ventral hypohyal; length of the coronomeckelian bone less than 20% the length of Meckel’s cartilage; head length to the rear of the opercle 15.0-16.3% LEA; mouth width 7.0-10.3% HL; teeth on the dentary restricted to the anterior one-half or slightly more of the dorsal margin; presence of a narrow dark stripe along the lateral line and a broad band of dusky to dark pigmentation overlying the basal pterygiophores of the anal fin; 19-21 pectoral-fin rays; and 204-221 anal-fin rays (Ref. 93148).
Found in rapids (Ref. 93148).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Vari, R.P., C.D. de Santana and W.B. Wosiacki, 2012. South American electric knifefishes of the genus Archolaemus (Ostariophysi, Gymnotiformes): undetected diversity in a clade of rheophiles. Zoological Journal of the Linnaean Society 165:670-699. (Ref. 93148)
IUCN Red List Status (Ref. 125652)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82804
= 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00363 (0.00169 - 0.00782), b=2.96 (2.77 - 3.15), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.1 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref. 59153
): Low vulnerability (11 of 100).