A new species of the <i>Eigenmannia trilineata</i> (Gymnotiformes: Sternopygidae) species group from the río Orinoco basin, Venezuela

Peixoto, Luiz A. W.; Waltz, Brandon T.

doi:10.1590/1982-0224-20150199

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ARTICLES • Neotrop. ichthyol. 15 (01) • 2017 • https://doi.org/10.1590/1982-0224-20150199 copy

A new species of the Eigenmannia trilineata (Gymnotiformes: Sternopygidae) species group from the río Orinoco basin, Venezuela

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of the Eigenmannia trilineata species group is described from the río Orinoco basin, Venezuela. The new species is distinguished from congeners by a unique set of characters including an ossified basibranchial 1; 198-217 anal-fin rays; suborbital depth, 21.3-26.1% HL; length of anterodorsal process of maxilla equal to the width of the posterior nostril; premaxilla with 17 teeth distributed in three rows; hyaline pectoral and anal fins; and number of scale series above lateral line, 9-10. It raises the number of species allocated to the Eigenmannia trilineata species group to 13 and the number of species within the genus to 18.

Keywords:
Biodiversity; Electric-fishes; Taxonomy; Tuvira

	Holotype	Min	Max	Mean	SD	N
Total length (mm)	160.0	113.8	160.0	-	-	13
Length to end of anal fin (mm)	131.8	65.3	131.8	-	-	14
Head length (mm)	13.6	9.2	15.8	-	-	14
	Percentage of LEA
Head length	10.3	10.3	15.1	12.3	-	14	1.7	14
Preanal distance	13.5	12.7	18.9	15.2	1.9	14
Prepectoral distance	11.3	11.3	16.3	13.1	1.8	14
Snout to anus	5.6	5.6	8.0	6.8	0.9	14
Body depth at pectoral fin	13.3	12.9	18.8	15.6	2.1	14
Body depth at anal fin	12.1	11.7	16.0	13.9	1.5	14
Body width	4.2	4.1	6.1	4.9	0.8	14
Anal-fin length	89.6	80.0	89.6	85.4	2.1	14
Pectoral-fin length	7.7	7.3	11.2	8.6	1.5	13
Caudal-filament length	22.6	21.2	44.5	34.8	7.9	11
Caudal-filament depth	1.6	1.2	2.6	1.4	0.1	11
Caudal-filament width	1.0	0.7	1.1	0.9	0.1	11
	Percentage of HL
Snout length	25.1	22.5	28.3	25.3	0.1	11	1.8	16
Internasal distance	9.5	7.2	10.5	9.0	1.1	16
Snout to posterior naris distance	19.8	16.3	21.0	19.0	1.6	16
Posterior naris to orbit distance	7.3	6.9	9.9	8.1	1.1	16
Internarial width	17.3	14.6	18.4	16.8	1.1	16
Orbital diameter	20.6	17.3	22.4	20.1	1.2	16
Postorbital distance	52.3	50.1	55.5	52.4	1.9	16
Opercular opening	25.9	23.9	32.1	28.2	1.9	16
Suborbital depth	21.3	20.6	26.8	23.2	2.1	16
Interorbital distance	34.0	27.9	37.2	33.2	1.9	16
Head width at opercle	63.3	58.3	66.1	61.4	2.6	16
Head width at orbits	50.9	39.5	50.9	46.3	2.9	16
Head depth at supraoccipital	77.9	74.2	82.3	79.1	2.3	16
Head depth at orbits	58.4	53.9	64.2	58.5	3.1	16
Maxilla length	23.2	15.9	23.2	19.4	2.5	16
Oral width	20.1	18.7	21.7	20.0	1.1	16

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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