Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Gymnotiformes
(Knifefishes) > Hypopomidae
Etymology: Hypopygus: Greek, hypo = under + Greek, pyge = tail (Ref. 45335); minissimus: The specific epithet, minissimus, is from the superlative of the Latin minimus (smallest), in reference to the status of this species as the smallest known gymnotiform (Ref. 88778).
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic. Tropical
South America: Hypopygus minissimus is known only from the upper Orinoco in Venezuela (vicinity of San Fernando de Atabapo, Río Cunucunuma, and Río
Sipapo), and from a tributary of the Casiquiare canal in Venezuela (Río Candela) (Ref. 88778).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 6.2 cm TL male/unsexed; (Ref. 88778)
Morphology | Morphometrics
Hypopygus minissimus is diagnosed from congeners by the following combination of characters: the absence of oblique bands (versus presence in all congeners), the absence of scales at midbody (versus presence in all congeners), the absence of the sixth infraorbital bone (versus presence in all congeners except H. hoedemani and H. lepturus), the total number of anal-fin rays (102–113 versus 136–170 in all congeners except H. hoedemani and H. lepturus), and the dorsal rami of the intermittent branch of the anterior lateral line nerve visible as two black parallel lines (versus not visible in H. ortegai) (Ref. 88778).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
de Santana, C.D. and W.G.R. Crampton, 2011. Phylogenetic interrelationships, taxonomy, and reductive evolution in the Neotropical electric fish genus Hypopygus (Teleostei, Ostariophysi, Gymnotiformes). Zool. J. Linn. Soc. 163:1096-1156. (Ref. 88778)
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
= 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00145 - 0.00994), b=3.06 (2.83 - 3.29), 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
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .