Cat-eLog Right Arrow Auchenipteridae Right Arrow Centromochlinae Right Arrow The genus Gelanoglanis

Jump to next section Summary of Gelanoglanis
Etymology Gelanoglanis: Greek, gelanes, -es, -es = happy, smiling + Greek, glanis = a fish that can eat the bait without touching the hook; a cat fish.
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.
Sexing As in other members of the auchenipterid subfamily Centromochlinae, anal-fin forms an intromittent structure in adult males.
Size Smallest 22mm, largest 36mm, average 27mm, most commonly 22mm. All SL.
Species There are 5 "species" in the database
New spp. / time
1750 1770 1790 1810 1830 1850 1870 1890 1910 1930 1950 1970 1990 2010 

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Jump to next section Distribution of selected Gelanoglanis species


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