AquaticRepublic.com - Gelanoglanis varii (Auchenipteridae) All Fishes

Holotype, female
Paratype, male

All Fishes Data Sheet
Scientific Name	**Gelanoglanis varii** Calegari & Reis, 2016
Common Name
Type Locality	Border between Maranhão and Tocantins States, Tocantins River upstream to the Estreito hydroelectric power plant, Amazon basin, Brazil, 6°30'17"S, 47°25'50"W.
Etymology	Gelanoglanis: Greek, gelanes, -es, -es = happy, smiling + Greek, glanis = a fish that can eat the bait without touching the hook; a cat fish. varii: Named after Richard P. Vari, a tribute for his great devotion, fascination and contributions to the study of the Auchenipteridae and other Neotropical fishes, and for his unlimited willingness to help young ichthyologists to develop their careers.
Species Information
Identification	Diminutive auchenipterid catfishes, distinguished by the following unique combination of characters: Single pair of chin barbels (vs. two pairs); pectoral spine, if present, lacking serrations on anterior margin; posterior nare large and immediately anterior to small eye; oblique, sinuous mouth with free fleshy flange around angle of gape; dorsal, anal, and paired fins short based with few rays; third pectoral-fin radial absent. Other shared traits include: Premaxillary tooth patches laterally oriented and widely separated anteriorly at midline; frontals sutured along midline for entire length; anterior fontanelle absent; vomer absent; mesopterygoid reduced to small round bone; mandibular ramus of lateral-line canal free from dentary. Key for the species of Gelanoglanis (Calegari, Reis & Vari, 2014; Calegari & Reis, 2017) 1a. Pelvic fin almost reaching to the urogenital opening................ 2 1b. Pelvic fin falling short of the urogenital opening by a distance longer than the anal-fin length................ G. varii 2a. Dorsal and pectoral fins with spine................ 3 2b. Dorsal and pectoral fins lacking spine................ G. nanonocticolus 3a. Adult males with short gonopodium terminating at anal-fin origin; premaxillary teeth occupying two-thirds of length of premaxilla; anterior fontanel absent................ 4 3b. Adult males with long gonopodium extending posteriorly to midlength of base of anal fin; premaxillary teeth restricted to anterior portion of bone, occupying one-half or less of length of premaxilla; anterior fontanel present................ G. pan 4a. Dorsal-fin spine with strong serrae along posterior margin................ G. stroudi 4b. Dorsal-fin spine simple, without serrae along posterior margin................ G. travieso. Gelanoglanis varii is distinguished from all congeners by the pelvic fin falling short of the urogenital opening by a distance longer than the anal-fin length. Additionally, G. varii lacks a dorsal-fin spinelet; has the first unbranched pectoral and dorsal-fin rays soft; has the adipose fin in adults preceded by a long fleshy tissue ridge, originating close to the end of the dorsal-fin base; and has a shorter maxilla, ending about the middle of the hyomandibula (v. terminating posteriorly forward of the anterior margin or surpassing the middle of operculum).
Sexing	Males possess a gonopodium, which is separated from the anal-fin base.
General Remarks	In the wild, G. varii were collected in wide, open waters of the middle Tocantins River.
Habitat Information
Distribution	Amazon, Lower Amazon, Tocantins, Middle Tocantins (click on these areas to find other species found there) Login to view the map.
IUCN Red List Category	Data Deficient , range map and more is available on the IUCN species page. Last assessed 2020.
Husbandry Information
Feeding	Stomach contents of one wild-caught specimen included dipterans. User data.
Breeding Reports	There is no breeding report.
Further Information
Reference	Journal of Fish Biology v. 90 (no. 5), pp 3 [1704], Figs. 1-3, 4b.
Registered Keepers	There is no registered keeper.
Wishlists	Love this species? Click the heart to add it to your wish list. There is no wish to keep this species.
Spotters	Spotted this species somewhere? Click the binoculars! There is no record of this fish being seen.
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	Look up G. varii on PlanetCatfish.com
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	Look up G. varii on Encyclopedia of Life
	Look up G. varii on Global Biodiversity Information Facility
	LFS label creator ARN ref:1.22.1273.7021
Last Update	2025 Jan 01 11:53 (species record created: 2017 Jul 20 17:18)