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Jump to next section Cat-eLog Data Sheet
Scientific NameTrichomycterus aguarague  (Fernández & Osinaga, 2006)
Common Name
Type LocalityBolivia, Tarija, Province Gran Chaco, National Park Aguarague, Quebrada Timboycito, a Rıo Caiguami tributary, elevation, 700 – 800 m, 21 March 2003, 21°30'S, 63°60'W.
EtymologyTrichomycterus: From the Greek trichos, meaning hair and mykter, meaning nose; in reference to the barbels. The specific epithet, aguarague, refers to Aguarague National Park, the type locality of the species; treated as a noun in apposition to the generic name.
Jump to next section Species Information
Size 56mm or 2.2" SL. Find near, nearer or same sized spp.
IdentificationTrichomycterus aguarague is readily distinguished from all other congeners from western and southern South America by having five precaudal vertebrae, maxillary barbel base engrossed and wide like a skin flap or fold, premaxillary bone smaller than maxilla, and the odontodes embedded in thick integument that covers interopercle (except this character is shared with T. alterus (Marini, Nichols & La Monte), T. belensis Fernández & Vari, T. ramosus Fernández, and T. boylei (Nichols), which are all from Argentina.)
Color in alcohol: T. aguarague demonstrates considerable variation in intensity of pigmentation on the head and body. Most have pattern of distinct, albeit faint, marbled formed by patches of small dark chromatophores. Darkly pigmented specimens with marbled, dark pigmentation present on dorsal and dorsolateral surfaces of head and trunk and all but ventral-most portion of caudal peduncle. Ventral surface of head ranging from lightly pigmented to hyaline. All barbels pigmented at least to some degree and opercular and interopercular odontodes and oral dentition unpigmented, even in overall more darkly pigmented individuals. Dorsal, anal, and pectoral fins with irregular dark pigmentation present on rays and membranes. Caudal fin with membranes irregularly darker than those of other unpaired fins. Pelvic fin ranging from lightly pigmented to hyaline.
Jump to next section Habitat Information
DistributionSouth America: Aguarague National Park in Bolivia.
La Plata, Paran√°, Paraguay, Pilcomayo, Upper Pilcomayo (click on these areas to find other species found there)
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Jump to next section Husbandry Information
FeedingStomach contents of one wild-caught specimen contained dipteran larvae; a diet of autochthonous benthic macroinvertebrates is common to many congeners.
FurnitureIn the wild, found in mountainous rivers and streams that are generally 3–6m wide and 0.32–1.35m deep, with clear waters running over sandy and rock-pebble substrates, at elevations of approximately 615–910 m. The region is characterized by torrential hydrological conditions associated with abundant summer rains between January and March and a May to November dry season. Water temperatures 24–30C and the pH 7.5. Water current velocities were 9.4–15.6m/s during the dry season.
Jump to next section Further Information
ReferencesEnvironmental Biology of Fishes v. 75: 385-393.
Registered KeepersNone.
Breeding ReportsNone.
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Last Update2017 Jan 07 02:24 (species record created: 2014 Jul 02 19:08)