A new species of <i><i>Tetragonopterus</i></i> (Characiformes: Characidae) from Central Amazon lowlands, Brazil

Urbanski, Bruna Q.; Melo, Bruno F.; Silva, Gabriel S. C.; Benine, Ricardo C.

doi:10.1590/1982-0224-20170158

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Original article • Neotrop. ichthyol. 16 (2) • 2018 • https://doi.org/10.1590/1982-0224-20170158 copy

A new species of Tetragonopterus (Characiformes: Characidae) from Central Amazon lowlands, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of Tetragonopterus is described from lowland rivers of Central Amazon. It differs from congeners by having a vertically-oriented patch of dark pigmentation limited to posterior portion of the caudal peduncle and by bearing five thin and sharp teeth on dentary, along with other morphometric and meristic features. We hypothesize that the new taxon belongs to the herein named “Tetragonopterus anostomus clade” that includes T. anostomus, T. denticulatus, T. kuluene, and T. juruena.

Keywords:
Biodiversity; Freshwater fishes; South America; Taxonomy; Tetragonopterinae

	Holotype	N	Range	Mean	SD
Standard length (mm)	64.1	28	54.6-81.6	65.4	-
Percentages of standard length
Body depth	49.5	28	47.5-54.9	52.4	2.0
Predorsal length	50.9	28	49.0-53.0	50.8	0.9
Prepectoral length	32.1	28	30.5-34.6	32.1	0.9
Prepelvic length	54.1	28	50.4-56.7	54.0	1.5
Preanal length	69.5	28	68.7-75.9	73.3	1.9
Caudal-peduncle depth	11.1	28	10.4-12.2	11.5	0.4
Caudal-peduncle length	6.2	28	4.3-7.1	6.0	0.7
Pectoral-fin length	26.2	28	19.2-27.2	25.8	1.9
Pelvic-fin length	19.4	28	14.1-22.4	19.1	2.1
Dorsal-fin length	39.8	27	26.7-42.3	38.4	2.9
Length of dorsal-fin base	18.1	28	16.3-21.5	19.2	1.0
Anal-fin length	18.4	22	15.6-22.3	19.5	2.0
Length of anal-fin base	35.5	28	30.8-35.6	34.1	1.3
Distance from eye to dorsal-fin origin	37.4	28	35.4-40.1	37.8	1.2
Distance from dorsal-fin origin to caudal-fin base	55.3	28	51.6-58.8	54.1	1.7
Head length	31.0	28	28.8-32.3	30.5	0.9
Head depth	41.6	28	35.5-45.1	41.7	2.1
Percentages of head length
Snout length	18.9	28	16.7-23.8	19.9	1.7
Maxillary length	55.3	28	50.3-57.3	53.6	2.0
Horizontal orbital diameter	44.2	28	43.6-50.5	46.8	1.9
Least interorbital width	33.0	28	30.9-36.7	33.7	1.6

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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