Moenkhausia gracilima Eigenmann 1908
Creators: name: Ota, Renata Rúbia
name: Deprá, Gabriel de Carvalho
name: Graça, Weferson Júnio da
name: Pavanelli, Carla Simone
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Actinopterygii
Characiformes
Characidae
Moenkhausia
Moenkhausia gracilima

description: <i>Moenkhausia</i> cf. <i>gracilima</i> Eigenmann, 1908 <b>Fig. 8</b> Body elongated; greatest depth contained 3.3 to 3.5 and caudal peduncle depth 8.1 to 9.7 times in SL; head length 4.0 to 4.6, predorsal distance 1.9 to 2.1 and caudal peduncle length 6.8 to 9.5 in SL; snout length 3.0 to 3.7, horizontal orbital diameter 2.2 to 2.3 and least interorbital width 2.8 to 3.2 in HL. Mouth terminal; inner row of premaxilla with 4 or 5 teeth, outer with 3-5, dentary with 4 and maxilla with 0 to 2 teeth. Lateral line complete, with 32-34 pored scales; longitudinal series with 32-34 scales; transverse series above lateral line with 5 scale rows and below with 3 scale rows. Dorsal fin with 11 rays, pectoral fin with 12-13 rays, pelvic fin with 8 rays, anal fin with 20-24 rays and caudal fin with 19 rays. Ground color whitish; silver longitudinal stripe (brown or grey in fixed specimens), from humeral spot to caudal peduncle; distal portion of upper caudal-fin lobe darker than lower. <b>Maximum standard length.</b> 37.0 mm. <b>Distribution.</b> Upper rio Paraná basin. <b>Remarks.</b> Some specimens of <i>Moenkhausia</i> cf. <i>gracilima</i> were identified as <i>Hemigrammus marginatus</i> by Graça, Pavanelli (2007). Ota, RP <i>et al.</i> (2015) restricted the distribution of <i>H. marginatus</i> to the rio São Francisco basin and rivers of northeastern Brazil. <i>Moenkhausia</i> cf. <i>gracilima</i> can be distinguished by having a dark-brown humeral spot, lateral line completely pored, median caudal-fin rays hyaline, and the distal portion of upper caudal-fin lobe darker than the lower (<i>vs.</i> dark-brown humeral spot absent, lateral line incompletely pored, median caudal-fin rays darkbrown, continuous with longitudinal stripe, and caudal-fin lobes equally pigmented, in <i>M. bonita</i>, also identified as <i>H. marginatus</i> by Graça, Pavanelli, 2007). Marinho (2009) and Marinho, Langeani (2016) noted a species very similar to <i>M. gracilima</i>, from the Amazon basin, in the influence area of the Ilha Solteira Reservoir, speculating the possibility to be new. The specimens from the upper rio Paraná floodplain, captured there since 2009 by the Nupélia staff, match the description of the specimens from the Ilha Solteira Reservoir. However, as some characters of the specimens from the upper rio Paraná and the Amazon basin are overlapped, M. M. F. Marinho (in an e-mail, manoela.marinho@gmail.com, June 2017), suggested the identification as <i>M.</i> cf. <i>gracilima</i>.
description: Published as part of <i>Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da &amp; Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, pp. 1-111 in Neotropical Ichthyology 16 (2)</i> on page 32, DOI: 10.1590/1982-0224-20170094, http://zenodo.org/record/3678395
description: {"references": ["Pavanelli CS, Graca WJ, Zawadzki CH, Britski HA, Vidotti AP, Avelino GS, Verissimo S. Fishes from the Corumba Reservoir, Paranaiba River drainage, upper rio Parana basin, State of Goias, Brazil. Check List. 2007; 3 (1): 58 - 64.", "Ota RP, Lima FCT, Pavanelli CS. A new species of Hemigrammus Gill, 1858 (Characiformes: Characidae) from the central and western Amazon and rio Parana-Paraguai basins. Zootaxa. 2015; 3948 (2): 218 - 32.", "Marinho MMF. Analise filogenetica e revisao taxonomica das especies de Moenkhausia Eigenmann, 1903 do grupo M. lepidura (Ostariophysi: Characiformes: Characidae). [Master Dissertation]. Sao Jose do Rio Preto, SP: Universidade Estadual Paulista; 2009 Apr 24 [cited 2016 Dec 08]. Available from: Repositorio Institucional Universidade Estadual Paulista. http: // repositorio. unesp. br / handle / 11449 / 87587", "Marinho MMF, Langeani F. Reconciling more than 150 years of taxonomic confusion: the true identity of Moenkhausia lepidura, with a key to the species of the M. lepidura group (Characiformes: Characidae). Zootaxa. 2016; 4107 (3): 338 - 52."]}