A new species of the lowland <i>Oligosarcus</i> Günther species group (Teleostei: Ostariophysi: Characidae)

Menezes, Naércio Aquino; Ribeiro, Alexandre Cunha

doi:10.1590/1982-0224-20150083

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Articles • Neotrop. ichthyol. 13 (03) • Jul-Sep 2015 • https://doi.org/10.1590/1982-0224-20150083 linkcopy

A new species of the lowland Oligosarcus Günther species group (Teleostei: Ostariophysi: Characidae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstracts

A new characid species is described from the rio Jacuí basin, a coastal drainage from southern Brazil. Itis morphologically most similar to its sympatric congeners Oligosarcus jenynsii and O. jacuiensis , but can be distinguished from both species in having the interorbital region wider and the pectoral fin shorter and additionally from O. jenynsii in having a smaller orbital diameter.

Freshwater fish; Neotropical; South America; Systematics; Taxonomy

		Oligosarcus varii				Oligosarcus jenynsii				Oligosarcus jacuiensis
	Holotype	n	Range	Mean	SD	n	Range	Mean	SD	n	Range	Mean	SD
Standard length (mm)	184.0	6	181.0 - 197.0	183.8	77	49.0 - 165.0	102.4	34	92.0 - 205.0	142.2
	Percents of standard length
Depth at dorsal-fin origin	29.0	6	29.0 - 31.0	29.0	0.7	77	22.2 - 31.5	27.6	1.7	34	26.2 - 30.4	28.1	1.1
Snout to dorsal-fin origin	55.4	6	55.3 - 57.0	56.0	0.7	77	52.0 - 59.7	56.0	1.5	34	53.1 - 57.8	55.3	1.1
Snout to pectoral-fin origin	28.2	6	27.4 - 28.4	28.0	0.4	77	26.0 - 31.7	28.8	1.4	34	27.3 - 32.7	29.8	1.2
Snout to pelvic-fin origin	50.2	6	50.0 - 52.0	50.6	0.7	76	44.3 - 50.7	47.4	1.5	34	46.2 - 52.5	49.2	1.3
Snout to anal-fin origin	67.4	6	67.4 - 70.0	68.7	1.1	77	61.3 - 70.0	65.2	2.0	34	64.2 - 68.6	66.8	1.0
Caudal peduncle depth	8.4	6	8.4 - 8.8	8.6	0.2	77	8.0 - 10.3	9.0	0.5	34	8.0 - 9.6	9.0	0.3
Caudal peduncle length	12.5	6	11.4 - 12.5	12.0	0.4	76	10.8 - 14.6	12.4	0.8	34	11.1 - 14.8	12.5	0.8
Pectoral-fin length	17.5	6	17.5 - 18.2	17.8	0.2	77	18.3 - 23.0	20.4	1.1	34	17.6 - 22.2	19.3	1.1
Pelvic-fin length	14.1	6	14.1 - 14.5	14.3	0.1	76	14.1 - 18.0	16.2	0.8	34	14.8 - 17.7	15.7	0.8
Dorsal-fin base length	11.1	6	11.1 - 12.0	11.5	0.3	77	10.1 - 12.8	11.2	0.5	34	10.4 - 12.3	11.4	0.5
Dorsal-fin height	20.0	6	19.3 - 21.0	20.2	0.6	73	21.2 - 27.8	23.5	1.5	34	20.0 - 24.3	22.0	1.0
Anal-fin base length	24.2	6	21.8 - 24.3	23.4	1.0	76	22.5 - 28.3	26.1	1.1	34	22.7 - 27.0	25.1	1.1
Anal-fin lobe length	15.2	6	14.2 - 15.5	15.0	0.5	75	15.7 - 21.8	18.1	1.4	34	14.5 - 18.2	16.7	1.0
Eye to dorsal-fin origin	43.4	6	42.1 - 43.7	43.0	0.5	77	38.5 - 43.5	41.2	1.2	34	38.6 - 43.0	40.6	0.9
Bony head length	27.7	6	27.7 - 29.3	28.5	0.5	77	26.8 - 32.1	29.0	1.3	34	28.1 - 32.3	30.0	1.2
Dorsal-fin origin to caudal-fin base	49.0	6	47.5 - 49.1	48.0	0.7	77	45.2 - 52.0	47.7	1.3	34	46.1 - 50.3	47.7	1.2
	Percents of head length
Horizontal eye diameter	23.5	6	22.0 - 23.5	22.5	0.6	77	25.0 - 34.3	28.7	2.6	34	21.0 - 24.5	23.0	1.3
Snout length	30.4	6	29.0 - 31.7	30.3	0.9	77	25.7 - 32.7	32.7	1.5	34	30.0 - 34.5	31.4	1.4
Least interorbital width	25.5	6	25.0 - 26.5	25.3	0.7	77	18.4 - 24.4	21.4	1.4	34	20.0 - 24.4	22.0	1.1
Upper jaw length	58.8	6	55.7 - 58.8	57.2	2.0	77	51.6 - 61.8	57.2	2.1	34	57.1 - 63.6	59.5	2.0

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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
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