Description of a new species of Tatia from rio Tocantins drainage, central Brazil, with notes on Tatia simplex Mees, 1974 (Siluriformes, Auchenipteridae)

Souza, Jordson de Souza e; Sarmento-Soares, Luisa M.; Canto, André L. Colares; Ribeiro, Frank Raynner V.

doi:10.1590/1982-0224-2019-0111

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Original article • Neotrop. ichthyol. 18 (1) • 2020 • https://doi.org/10.1590/1982-0224-2019-0111 linkcopy

Description of a new species of Tatia from rio Tocantins drainage, central Brazil, with notes on Tatia simplex Mees, 1974 (Siluriformes, Auchenipteridae)

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Tatia comprises twenty-five valid species, distributed in the main inland watersheds of South America, including the Orinoco, Essequibo, and coastal rivers of Suriname, Amazon, upper rio Paraná and São Francisco basins. A new species is described from tributaries of upper rio Manuel Alves on uplands of Serra Geral do Tocantins plateau, Tocantins State, Brazil. It is promptly distinguished from all congeners, except Tatia britskii, due to absence of an adipose fin. It differs from T. britskii by the longer caudal peduncle length (24.1–30.5% SL, mean 25.3 vs. 20.0–22.7, mean 20.9); caudal peduncle depth (10.9–16.8 SL, mean 14.1 vs. 9.4–10.5, mean 9.8), and anterior cranial border with mesethmoid width equals its length (vs. width approximately three times its length in T. britskii). Additionally, information regarding the poorly known species Tatia simplex originally described from rio das Mortes, is provided.

Keywords:
Neotropical; Ostariophysi; South America; Systematics; Taxonomy

	Holotype	Range	Mean	SD
Standard length (mm)	33.2	27.2-35.5	31.2	-
Percents of standard length
Body depth	18.2	18.2–22.1	20.0	1.1
Body width	19.7	19.3–22.0	20.6	0.8
Caudal peduncle depth	12.3	10.8–16.8	14.1	1.3
Caudal peduncle length	30.5	24.1–30.5	25.3	2.0
Predorsal length	43.3	31.2–43.3	34.0	3.5
Preanal length	74.3	62.9–76.6	70.5	2.9
Prepelvic length	58.3	51.2–63.2	56.2	3.1
Dorsal origin to pectoral origin	7.0	7.0–12.2	9.7	1.1
Dorsal origin to pelvic origin	20.2	20.2–26.1	23.7	1.7
Pectoral origin to pelvic origin	32.0	30.9–40.6	34.1	2.4
Prepectoral length	25.2	21.4–28.9	23.9	1.9
Dorsal-fin base length	11.8	10.5–12.7	11.4	0.7
Anal-fin base length	10.3	8.8–13.2	11.1	1.3
Dorsal fin spine length	13.7	12.3–17.3	14.7	1.2
Pectoral fin spine length	28.1	20.3–28.2	24.0	2.3
Humeral spine lenght	17.0	13.6–18.9	17.0	1.2
Longest pelvic fin ray	10.0	8.5–11.3	9.9	0.7
Maxillary barbel length	38.3	31.1–43.6	37.8	3.6
Outer mental barbel length	10.2	8.1–12.5	10.1	1.3
Inner mental barbel length	7.1	4.0–8.0	6.6	1.2
Head length	30.0	24.6–30.7	28.1	1.6
Head width	59.3	44.9–63.9	57.3	4.3
Head depth	48.8	40.6–57.6	47.2	4.3
Interorbital distance	47.2	46.1–57.9	50.2	3.9
Percents of head length
Left internarial width	16.5	12.8–21.2	17.1	1.9
Anterior Internarial distance	28.3	22.4–29.9	26.7	2.2
Posterior internarial distance	31.2	30.0–38.2	33.3	2.4
Snout length	29.5	27.9–38.5	33.1	3.1
Orbital diameter	28.3	21.1–32.7	25.8	3.7
Mouth width	37.4	37.4–50.5	42.6	3.0

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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
E-mail: neoichth@nupelia.uem.br

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