AquaticRepublic.com - Gelanoglanis nanonocticolus (AUCHENIPTERIDAE) All Fishes

All Fishes Data Sheet
Scientific Name	**Gelanoglanis nanonocticolus** Soares-Porto, Walsh, Nico & Netto, 1999
Common Name
Type Locality	Río Asisa, 22-30 kilometers upstream from confluence with Río Paru, Río Ventuari drainage, Orinoco River basin, about 4°33'N, 65°54'W, elevation 115 meters.
Synonym(s)
Etymology	Gelanoglanis: Greek, gelanes, -es, -es = happy, smiling + Greek, glanis = a fish that can eat the bait without touching the hook; a cat fish.
Species Information
Size	22mm or 0.9" SL. Find near, nearer or same sized spp.
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. 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.
Sexing	As in other members of the auchenipterid subfamily Centromochlinae, anal-fin forms an intromittent structure in adult males. As in other members of the auchenipterid subfamily Centromochlinae, anal-fin forms an intromittent structure in adult males.
Habitat Information
Distribution	South America Orinoco, Upper Orinoco, Ventuari, Paru (Venezuela), Asisa (click on these areas to find other species found there) Amazon, Middle Amazon (Solimoes), Negro (click on these areas to find other species found there) Login to view the map.
IUCN Red List Category	Least Concern , a distribution map is available on the IUCN species page. Last assessed 2020.
pH	4.5 - 5.0
Other Parameters	Wild-caught individuals found in open water, with slow to moderate current, low pH, and sand substrate.
Husbandry Information
Breeding Reports	There is no breeding report.
Further Information
Reference	Ichthyological Exploration of Freshwaters v. 10 (no. 1), pp 65, Fig. 1.
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Spotters	Spotted this species somewhere? Click the binoculars! There is no record of this fish being seen.
More Resources
Forum BBCode

	Look up G. nanonocticolus on PlanetCatfish.com
	Look up G. nanonocticolus on Fishbase
	Look up G. nanonocticolus on Encyclopedia of Life
	Look up G. nanonocticolus on Global Biodiversity Information Facility
	LFS label creator ARN ref:1.22.1273.6526
Last Update	Thu Jan 01, 1970 1:00 am (Species record created: Thu Jan 01, 1970 1:00 am)