Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Characiformes
(Characins) > Crenuchidae
(South American darters) > Characidiinae
Etymology: Characidium: Diminutive of Charax, -akos = a fish without identification (Ref. 45335); amaila: Named for Amaila Falls, a striking feature of the Guiana Shield escarpment in western Guyana that will have altered flow following completion of a dam that is now being planned. A noun in apposition.
Environment / Climate / Range
Freshwater; benthopelagic. Tropical, preferred ?
South America: upper Kuribrong River (Potaro-Essequibo drainage), upstream of Amaila Falls in Guyana.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 8.6 cm SL male/unsexed; (Ref. 94269)
Morphology | Morphometrics
soft rays: 8;
Vertebrae: 35. It is distinguished from most congeners by lacking scales on the isthmus and chest, and by having 8-13 premaxillary teeth, the first four pectoral-fin rays noticeably thickened, 34-36 lateral line scales, and branchiostegal membranes that are free from each other across the isthmus. It differs further by its large adult body size (max. = 85.5 mm SL), and by having a tan body base color with a dark midlateral stripe that originates on the upper lip and continues posteriorly to the base of the middle caudal-fin rays, a gray to dark-black dorsum with two horizontal rows of small light spots formed by aligned light-colored scale centers, a dark humeral spot, up to 15 irregular black bars that extend from dorsum to lower sides, a light opercular margin, and fins that are uniformly dusky. Several cranial, vertebral, and swim bladder characteristics make this species distinct from other congeners (Ref. 94269)
Collected from each of five separate rapids habitats encountered in the upper Kuribrong watershed. Inhabits shallow sandstone bedrock rapids with abundant attached macrophytes, including a representative of the Podostemaceae, a representative of the Eriocaulaceae
(Rhondonanthus capillaceus), and a third species with long grass-like leaves (Ref. 94269).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Lujan, N.K., H. Agudelo-Zamora, D.C. Taphorn, P.N. Booth and H. López-Fernández, 2013. Description of a new, narrowly endemic South American Darter (Characiformes: Crenuchidae) from the Central Guiana shield highlands of Guyana. Copeia 2013(3):454-463. (Ref. 94269)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg 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=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), based on all LWR estimates for this body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.6 ±0.3 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .