A new species of the catfish genus <i>Centromochlus</i>
               (Siluriformes: Auchenipteridae: Centromochlinae) from the upper rio Paraná basin,
               Brazil

Sarmento-Soares, Luisa Maria; Birindelli, José Luís Olivan

doi:10.1590/1982-0224-20140042

Brasil

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Articles • Neotrop. ichthyol. 13 (1) • Jan-Mar 2015 • https://doi.org/10.1590/1982-0224-20140042 linkcopy

A new species of the catfish genus Centromochlus (Siluriformes: Auchenipteridae: Centromochlinae) from the upper rio Paraná basin, Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

Centromochlus comprises twelve species, distributed in the main inland watersheds of South America, including the Orinoco, Essequibo, coastal rivers of Suriname, Amazon, upper Paraná and São Francisco basins. The new species is described from the upper rio Paraná based on material collected in 1965 during the construction of the UHE Ilha Solteira, São Paulo, Brazil. The new species is easily distinguished from all congeners due to absence of adipose fin, a condition otherwise restricted to Gelanoglanis nanonocticolus, among centromochlin catfishes. The new species comprises small catfishes (adults ranging from 35 to 39 mm SL), in which modified anal fin of males is devoid of denticulations or spines, and most posterior rays reduced in length. In addition, Tatia simplex Mees is transferred to Centromochlus and its generic reassignment discussed.

Ostariophysi; South America; Systematics; Taxonomy; Tatia simplex

	Holotype	Range	Mean	SD	N
Standard length	39.2	33.5-39.2	36.6		6
Percent of standard length
Body depth	16.6	14.6-17.1	16.2	0.85	6
Body width	19.1	17.9-19.7	19.1	0.67	6
Caudal peduncle depth	9.4	9.4-10.9	9.8	0.53	6
Caudal peduncle length	22.7	20.0-22.7	20.9	1.25	6
Predorsal length	32.4	31.7-33.4	32.5	0.75	6
Preanal length (male)	77.0	75.4-77.0	76.2	1.17	3
Preanal length (female)		72.2-72.5	72.3	0.17	3
Prepelvic length	57.9	56.7-59.6	58.4	1.11	6
Dorsal origin to pectoral origin	19.1	17.6-20.0	19.0	0.81	6
Dorsal origin to pelvic origin	30.6	30.6-33.1	32.2	0.85	6
Pectoral origin to pelvic origin	35.2	35.2-37.2	36.2	0.65	6
Prepectoral length	25.0	22.5-25.4	24.1	1.13	6
Dorsal-fin base length	9.9	9.9-12.5	11.0	1.03	6
Anal-fin base length (male)	5.4	5.4-6.2	5.8	0.613
Anal-fin base length (female)	-	8.38-10.7	9.7	0.983
Dorsal-fin spine length	13.3	13.3-15.6	14.3	0.91	6
Pectoral-fin spine length	22.7	20.7-22.7	22.1	0.86	6
Posterior process of cleithrum length	16.6	15.8-17.1	16.5	0.42	6
First branched pelvic-fin ray length	11.7	10.9-12.2	11.5	0.53	6
Longest anal fin ray (male)	14.5	14.5-15.0	14.8	0.34	3
Longest anal fin ray (female)	-	30.9-31.6	31.2	0.40	3
Maxillary barbel length	32.4	24.9-32.4	30.3	2.74	6
Outer mental barbel length	11.5	9.3-11.5	9.8	0.84	6
Mental barbel length	7.1	6.2-7.8	6.7	0.61	6
Head length	23.2	22.5-26.6	24.6	1.58	6
Percent of head length
Head width	64.8	61.1-65.5	64.0	1.68	6
Head depth	52.7	46.3-52.7	49.5	2.36	6
Interorbital distance	42.9	40.0-46.0	42.6	2.17	6
Left internarial distance	26.4	21.1-26.4	25.1	2.04	6
Anterior internarial distance	33.0	29.2 – 33.0	31.2	1.53	6
Posterior internarial distance	31.9	31.5-34.7	33.5	1.41	6
Snout length	30.8	28.4-31.0	29.9	0.97	6
Orbital diameter	20.9	19.5-23.6	21.8	1.51	6
Mouth width	40.7	33.7-40.7	38.0	2.41	6

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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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