A new species of <i>Bryconops</i> (Ostariophysi: Characiformes: Characidae) from the upper rio Tocantins drainage, Brazil

Guedes, Tharles L. O.; Oliveira, Everton F.; Lucinda, Paulo H. F.

doi:10.1590/1982-0224-20150176

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ARTICLES • Neotrop. ichthyol. 14 (02) • 2016 • https://doi.org/10.1590/1982-0224-20150176 copy

A new species of Bryconops (Ostariophysi: Characiformes: Characidae) from the upper rio Tocantins drainage, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

A new species of the genus Bryconops , subgenus Bryconops , is described from the rio Conceição, a tributary to the rio Palma, upper rio Tocantins drainage, Tocantins State, Brazil. The new species is distinguished from all its congeners, except B. humeralis and B. vibex by the color pattern in vivo (dorsal, adipose, and caudal fins entirely orange). The new species is easily distinguished from B. humeralis and B. vibex by the absence of a humeral spot and by the lack of maxillary teeth (vs . presence of a single humeral spot and presence of 1-3 maxillary teeth on both sides). Furthermore, the new species is distinguished from B. vibex by the number of perforated lateral line scales (38-41 vs. 44-46).

Keywords:
Biodiversity; Freshwater; Rio Conceição; Systematics; Taxonomy

ILM Measurement	Holotype	n	Range	Mean	SD
(1-6): Standard Length (mm)	53.7	44	37.7-65.0	49.9	-
Percents of Standard Length
(1-3): Snout to dorsal-fin origin	49.7	44	48.0-51.9	49.9	-	50.2	0.765
(1-10): Snout to pectoral-fin insertion	27.4	44	26.6-31.2	28.2	0.958
(1-9): Snout to pelvic-fin insertion	51.4	44	50.4-54.7	52.3	0.941
(1-8): Snout to anal-fin origin	64.4	44	63.1-67.4	65.2	0.948
(3-9): Dorsal-fin origin to pelvic-fin insertion	26.3	44	24.5-28.9	26.4	1.107
(8-7): Anal-fin origin to base of last anal-fin Ray	25.9	44	22.8-27.3	25.3	0.862
(7-6): Anal-fin terminus to hypural plate	13.2	44	10.5-13.8	12.3	0.788
(1-14): Head length	26.1	44	25.5-28.0	26.7	0.584
(1-12): Snout length	5.2	44	4.5-6.1	5.6	0.322
(1-11): Maxillary length	13.8	44	13.5-14.9	14.2	0.365
(12-13): Horizontal eye diameter	13.0	44	12.3-14.4	13.2	0.467
(12left-12right): Interorbital width	8.4	44	8.1-8.9	8.4	0.197
(1-2): Snout to tip of supraoccipital spine	24.6	44	23.9-26.6	25.3	0.669
(3-10): Dorsal-fin origin to pectoral-fin insertion	35.2	44	33.7-36.6	35.1	0.733
(3-8): Dorsal-fin origin to anal-fin origin	30.2	44	27.3-31.6	29.5	1.004
(10-9): Pectoral-fin insertion to pelvic-fin insertion	25.0	44	23.7-26.3	25.1	0.622
(5-8): Adipose terminus to anal-fin origin	29.6	44	27.1-29.9	28.7	0.665
(5-6): Adipose terminus to hypural plate	15.8	44	12.2-17.0	15.2	0.989
(5-7): Adipose terminus to base of last anal-fin ray	10.4	44	9.6-11.3	10.4	0.379
(3-5): Dorsal-fin origin to adipose terminus	37.4	44	35.1-37.9	36.4	0.721
Percents of Head Length
(1-12): Snout length	20.0	57	17.1-22.9	36.4	0.721	20.9	1.135
(1-11): Maxillary length	52.9	57	50.7-55.2	52.7	0.959
(12-13): Horizontal eye diameter	50.0	57	46.5-52.3	49.3	1.270
(12left-12right): Interorbital width	32.1	57	29.3-34.2	31.3	0.934
(1-2): Snout - tip of supraoccipital spine	94.3	44	90.3-100.0	94.5	1.877

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
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