Redescription of <i>Moenkhausia melogramma</i> (Characiformes: Characidae), a poorly known tetra from the western Amazon basin

Soares, Isabel M.; Ota, Rafaela P.; Lima, Flávio C. T.; Benine, Ricardo C.

doi:10.1590/1982-0224-2020-0025

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Original article • Neotrop. ichthyol. 18 (3) • 2020 • https://doi.org/10.1590/1982-0224-2020-0025 linkcopy

Redescription of Moenkhausia melogramma (Characiformes: Characidae), a poorly known tetra from the western Amazon basin

Authorship SCIMAGO INSTITUTIONS RANKINGS

Moenkhausia melogramma is herein redescribed, based on the examination of the holotype plus additional specimens from the western Amazon basin in Brazil, Colombia, Peru, and Ecuador. Moenkhausia melogramma shares with M. collettii, M. conspicua, M. copei, M. venerei, and M. flava a broad dark longitudinal stripe across the eye, and a well-defined dark stripe on the anal-fin base. It can be promptly distinguished from these species by having two humeral blotches. Additionally, we provide comments on the putative relationships of Moenkhausia melogramma with the aforementioned congeners and the Hemigrammus lunatus species-group.

Keywords:
Bony hooks; Color pattern; Hemigrammus machadoi; Moenkhausia collettii species-group; Taxonomy

	holotype	n	range	mean±SD
Standard length (mm)	38.3	341	21.9-52.4	33.9±5.7
Head length (mm)	10.0	341	6.2-14.0	9.2±1.4
Percentages of standard length
Depth at dorsal-fin origin	39.9	341	28.5-45.0	37.7±3.1
Head length	26.0	341	24.6-30.1	27.2±1.1
Head depth	31.3	341	23.6-35.5	29.9±2.0
Dorsal-fin length	24.1	305	29.9-40.5	35.2±2.1
Dorsal-fin base		340	13.4-19.0	16.4±1.0
Pectoral-fin length	20.5	337	20.6-26.6	23.3±1.0
Pelvic-fin length	14.9	336	16.9-23.5	19.9±1.0
Anal-fin length	14.6	289	21.5-31.5	26.1±1.9
Anal-fin base		339	27.0-37.3	32.7±2.2
Caudal peduncle length	11.0	338	5.3-12.9	8.4±1.4
Caudal peduncle depth	9.6	338	6.9-12.0	10.1±0.8
Eye to dorsal-fin origin	37.1	341	30.0-38.1	34.3±1.4
Snout to dorsal-fin origin	51.2	340	45.1-53.2	49.3±1.4
Snout to pectoral-fin origin	29.7	341	26.3-32.2	29.0±1.1
Snout to pelvic-fin origin	46.4	340	42.9-63.9	47.7±2.2
Snout to anal-fin origin	62.9	341	59.7-70.3	64.8±2.2
Percentages of head length
Snout length	29.6	341	16.2-26.5	20.7±1.8
Upper jaw length	42.3	340	35.7-47.9	42.9±2.3
Horizontal eye diameter	40.5	341	34.7-49.9	41.8±2.4
Least interorbital width	32.8	341	27.4-36.7	32.7±1.6

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Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Departamento de Biologia Animal e Vegetal, CCB, Universidade Estadual de Londrina, Rodovia Celso Garcia Cid, Km 380, Cidade Universitária, 86055-900, Londrina, Paraná, Brazil, Phone +55(43)3371-5151 - Londrina - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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