A new species of Boehlkea (Characiformes: Characidae: Stevardiinae) from the rio Japurá, Amazon basin, Brazil

Soares, Isabel M.; Bertaco, Vinicius A.; Ito, Priscila Madoka M.; Zuanon, Jansen

doi:10.1590/1982-0224-20170026

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ARTICLES • Neotrop. ichthyol. 15 (3) • 2017 • https://doi.org/10.1590/1982-0224-20170026 copy

A new species of Boehlkea (Characiformes: Characidae: Stevardiinae) from the rio Japurá, Amazon basin, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of Boehlkea is described from rio Japurá, Amazon basin. The new species differs from B. fredcochui by the presence of a vertically elongate humeral spot (vs. absence), complete lateral line (vs. incomplete), four rows of scales below lateral line (vs. three), and lower number of branched anal-fin rays (17-21 vs. 22-25), and from B. orcesi by the higher number of maxillary teeth (13-14 vs. 5-12), greater head length (27.9-29.9% vs. 24.3-27.5% of SL), and by the color pattern (basal half of dorsal-fin, distal portion of pelvic-fin, lower caudal-fin lobe and anal-fin with black chromatophores vs. absence of black chromatophores in the fins).

Keywords:
Characidae “Clade A”; Color pattern; Hemibrycon; Lateral line length; Taxonomy

	Boehlkea weitzmani					Boehlkea fredcochui			Boehlkea orcesi
	holotype	n	range	mean	SD	holotype	A	B	holotype	n	range	mean
Standard length (mm)	33.7	32	22.3-34.8	28.4		39.3	31.8	29.8	47.5	4	44.2-48.7	46.5
Percentages of standard length
Predorsal distance	51.9	32	49.7-56.8	52.8	1.6	54.9	55.8	53.6	54.0	4	53.1-54.4	53.8
Prepectoral distance	26.1	32	24.3-27.5	25.8	0.9	26.8	25.7	26.8	30.2	4	28.1-30.2	29.0
Prepelvic distance	47.1	31	43.9-50.7	47.0	1.4	48.2	46.9	46.2	49.6	4	47.8-51.0	49.2
Preanal distance	59.9	32	56.9-63.6	60.9	1.7	62.4	59.7	60.2	62.5	4	60.9-66.2	63.3
Depth at dorsal-fin origin	30.3	32	24.9-31.3	28.1	1.5	33.0	30.2	29.3	38.2	4	35.0-39.0	37.2
Caudal-peduncle depth	11.1	32	8.6-12.1	10.6	0.7	11.4	11.4	10.5	12.2	4	11.5-12.2	11.8
Caudal-peduncle length	10.9	32	7.3-12.4	9.8	1.3	10.8	11.0	8.4	16.9	4	14.8-17.2	16.4
Dorsal-fin length	22.8	32	20.0-24.1	22.3	0.9	24.4	24.8	23.8	25.0	4	24.2-25.2	24.7
Pectoral-fin length	21.2	32	18.4-22.2	20.7	1.0	20.5	20.4	19.9	22.2	4	21.0-22.9	22.0
Pelvic-fin length	14.6	31	11.6-15.0	13.5	0.8	12.8	14.2	13.9	15.7	4	14.1-15.7	15.3
Anal-fin base	28.3	32	24.3-31.8	28.5	1.6	32.3	35.3	31.9	28.3	4	24.8-29.2	26.8
Head length	25.1	32	24.3-27.5	25.7	0.8	24.8	26.0	25.8	29.9	4	27.9-29.9	28.7
Percentages of head length
Snout length	21.6	32	18.0-28.4	23.0	2.4	21.7	23.6	22.3	20.6	4	20.4-20.9	20.6
Upper jaw length	47.0	32	41.5-50.7	46.3	2.3	47.4	45.3	46.2	49.8	4	48.0-49.8	49.0
Orbital diameter	43.1	32	37.7-45.7	41.2	1.7	32.3	35.6	37.0	31.4	4	31.4-35.8	33.0
Interorbital width	34.5	32	27.0-35.1	32.2	2.1	35.6	36.6	32.8	33.2	4	31.2-33.3	32.7

	Total teeth
	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21
Boehlkea fredcochui								1	5	4	3	1	2	1			1
Boehlkea orcesi									2	1		1
Boehlkea weitzmani	1	1	5	7	10	6	1	1

Sociedade Brasileira de Ictiologia Neotropical Ichthyology, Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá., Av. Colombo, 5790, 87020-900, Phone number: +55 44-3011-4632 - Maringá - PR - Brazil
E-mail: neoichth@nupelia.uem.br

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