A new species of <i>Utiaritichthys</i> Miranda Ribeiro (Characiformes: Serrasalmidae) from the Serra dos Parecis, Tapajós drainage

Pereira, Thiago N. A.; Castro, Ricardo M. C.

doi:10.1590/1982-0224-20130137

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Article • Neotrop. ichthyol. 12 (2) • Apr-Jun 2014 • https://doi.org/10.1590/1982-0224-20130137 linkcopy

A new species of Utiaritichthys Miranda Ribeiro (Characiformes: Serrasalmidae) from the Serra dos Parecis, Tapajós drainage

SCIMAGO INSTITUTIONS RANKINGS

Abstract

Utiaritichthysesguiceroi is described from the upper portion of the rio Juruena, rio Tapajós drainage, Mato Grosso State, Central Brazil. The new species distinguished from its two congeners, U. sennaebragai Miranda Ribeiro and U. longidorsalis Jégu, Tito de Morais & Santos, by having 99 to 101 perforated scales on lateral line (vs. 69 to 83), presence of 17 to19 prepelvic spines (vs. 9-13 in U. sennaebragai and 28-31 in U. longidorsalis), 20 to 21 postpelvic spines (vs. 15 to 19 in U. sennaebragai, and 14 in U. longidorsalis), and 23 to 25 circumpeduncular scales (vs. 30-48 in U. sennaebragai, and 33-35 in U. longidorsalis). Furthermore, the new species differs from U. longidorsalis by having larger interdorsal width, and adipose-fin base length (11.8-15.6 vs. 7.1-7.9% of SL, and 4.2-5.8 vs. 3.7-3.8% of SL, respectively).

Neotropical fish; Pacú borracha; Systematics; Taxonomy; Upper Juruena basin

Character	H	n	Range	Mean	SD
Standard length	197.9	18	178.1-228.3	197.7	-
Percents of Standard Length (SL)
Greatest body depth	51.3	18	45.2-51.6	49.7	1.9
Head height	35.4	18	25.8-35.3	29.7	2.1
Head length	25.4	18	24.3-28.0	26.1	1.0
Dorsal fin base length	23.5	18	21.3-26.0	23.5	1.4
Dorsal fin length	24.8	18	19.4-29.0	22.3	2.0
Interdorsal width	13.6	18	11.8-15.6	14.4	0.9
Anal fin base length	26.1	18	24.1-28.4	25.8	1.1
Adipose fin base length	5.0	18	4.2-5.8	4.8	0.4
Pectoral fin length	20.5	18	18.0-20.6	19.4	0.8
Predorsal length	56.7	18	51.5-58.1	55.5	2.0
Preanal length	79.3	18	72.9-86.0	78.4	2.6
Prepectoral length	24.5	18	23.5-27.3	25.0	1.0
Prepelvic length	55.8	18	55.8-61.9	58.7	1.7
Pelvic/anal distance	10.5	18	8.0-10-5	9.0	0.6
Pelvic/pectoral distance	18.5	18	17.0-19.9	18.6	0.8
Caudal peduncle depth	9.7	18	8.4-9.7	9.1	0.3
Caudal peduncle length	7.9	18	6.1-9.6	7.7	1.0
Percents of Head Length (HL)
Eye diameter	27.8	18	21.5-27.8	24.7	1.4
Interorbital width	43.3	18	37.7-43.3	40.6	1.5
3^rd infraorbital width	13.2	18	9.9-14.5	13.0	1.1
4^th infraorbital width	15.1	18	12.0-17.8	15.1	1.1
Check gap width	14.2	18	9.7-14.2	11.7	1.1
Snout length	31.5	18	28.6-34.9	32.8	1.8
Postorbital distance	41.6	18	39.1-46.9	43.0	1.9
Percents of dorsal fin base length
Interdorsal width	58.1	18	53.3-65.6	60.0	3.2
Adipose fin base length	21.3	18	17.2-26.5	19.9	2.1

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