FB-66163 http://www.fishbase.org/summary/SpeciesSummary.php?id=66163 Animalia Chordata Teleostei Osteoglossiformes Mormyridae Petrocephalus Petrocephalus zakoni Lavoué, Sullivan & Arnegard, 2010 2011-07-05 2024-03-18 Mendonça, M.B. and W.B. Wosiacki0 A new species of <i>Hemigrammus</i> from the Lower Amazon Floodplain (Characiformes: Characidae). Copeia 2011(2):211-215. (Ref. 87304) FB-DiagnosticDescr-66172 http://purl.org/dc/dcmitype/Text text/html Frédéric Busson 2011-07-07 00:00:00 2011-07-07 00:00:00 http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=66172 Hemigrammus diagonicus can be easily differentiated from its congeners, except for Hemigrammus silimoni, by the presence of a blotch on the caudal fin restricted to the dorsal lobe (vs. no blotches on the caudal fin, blotches restricted to the base of the rays, or blotches arranged symmetrically in dorsal and ventral lobes). Hemigrammus diagonicus is distinguished from H. silimoni by the autapomorphic presence of the caudal-fin blotch shaped like a bar that extends diagonally from the base of the median rays to the end of the upper lobe rays (vs. conspicuous ocellus like blotch on the lower region of the caudal-fin dorsal lobe); height of dorsal fin 22.3–30.2% SL (vs. 31.0–37.4% SL); length of anal-fin base 24.0–28.0% SL (vs. 28.7–31.5% SL); horizontal eye diameter 33.8–41.3% HL (vs. 43.4– 48.1% HL) (Ref. 87304). Mendonça, M.B. and W.B. Wosiacki 2011 A new species of <i>Hemigrammus</i> from the Lower Amazon Floodplain (Characiformes: Characidae). Copeia 2011(2):211-215. (Ref. 87304) FB-Distribution-66172 http://purl.org/dc/dcmitype/Text text/html Frédéric Busson 2011-07-07 00:11:29 2025-11-05 00:00:00 http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=66172 South America: Brazil. Mendonça, M.B. and W.B. Wosiacki 2011 A new species of <i>Hemigrammus</i> from the Lower Amazon Floodplain (Characiformes: Characidae). Copeia 2011(2):211-215. (Ref. 87304) FB-Size-66172 http://purl.org/dc/dcmitype/Text text/html Frédéric Busson 2011-07-06 23:54:54 2024-03-18 00:00:00 Max. size http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=66172 2.8 cm SL (male/unsexed; (Ref. 87304)) Mendonça, M.B. and W.B. Wosiacki 2011 A new species of <i>Hemigrammus</i> from the Lower Amazon Floodplain (Characiformes: Characidae). Copeia 2011(2):211-215. (Ref. 87304) FB-Threats-2 http://purl.org/dc/dcmitype/Text text/html Belen Acosta 1990-10-18 00:00:00 2024-03-07 00:00:00 http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=2 Least Concern (LC) , IUCN Grouper and Wrasse Specialist Group IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006. FB-Habitat-66172 http://purl.org/dc/dcmitype/Text text/html Frédéric Busson 2011-07-06 23:54:54 2024-03-18 00:00:00 Environment http://creativecommons.org/licenses/by-nc/3.0/ http://www.fishbase.org/summary/SpeciesSummary.php?id=66172 benthopelagic; freshwater