A new spiny species of Hypostomus Lacépède (Loricariidae: Hypostominae) from thermal waters, upper rio Paraná basin, central Brazil

Martins, Fernanda O.; Langeani, Francisco; Zawadzki, Cláudio H.

doi:10.1590/1982-0224-20140035

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Articles • Neotrop. ichthyol. 12 (4) • Oct-Dec 2014 • https://doi.org/10.1590/1982-0224-20140035 copy

A new spiny species of Hypostomus Lacépède (Loricariidae: Hypostominae) from thermal waters, upper rio Paraná basin, central Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

A new species of Hypostomus is described from the rio Quente, rio Paranaíba drainage, in the upper rio Paraná basin in central Brazil. The rio Quente is a peculiar small and shallow fast water stream with water temperatures around 34ºC. The new species is distinguished from all congeners by having the five lateral series of plates with hypertrophied odontodes not aligned in rows and more conspicuous on flanks of caudal peduncle of the larger specimens. The new species is only known from the rio Quente.

Freshwater fishes; Neotropical region; Rio Quente; Siluriformes; Taxonomy

	Hypostomus yaku
	Holotype	Low		High		Mean		SD
Standard length	70.8	41.3		70.8		51.4		7.2

Percentages of standard length
Predorsal length	41.5	41.3		45.8		43.3		1.0
Head length	33.0	33.0		37.3		35.4		1.2
Interdorsal distance	17.5	15.8		20.2		17.7		1.1
Thoracic width	21.6	19.1		24.0		21.1		1.0
Abdominal width	20.7	18.4		21.9		20.4		0.9
Caudal peduncle length	31.2	29.4		33.1		30.9		1.0
Caudal peduncle depth	9.4	8.7		9.9		9.4		0.3
First dorsal-fin ray length	23.1	21.2		26.7		24.2		1.1
Dorsal-fin base length	24.1	21.8		25.2		23.5		0.8
First pectoral-fin ray length	24.6	23.6		27.8		26.0		1.0
First pelvic-fin ray length	24.0	22.1		26.3		24.5		1.3
Upper caudal-fin ray length	26.2	25.9		32.3		28.7		1.9
Lower caudal-fin ray length	29.1	29.8		36.9		33.2		1.9
Adipose-fin spine length	7.4	7.1		9.0		8.0		0.6
Cleithral width	31.1	30.1		33.8		31.5		0.9

Percentages of head length
Head depth	47.4	46.1		52.6		49.4		1.8
Snout length	62.4	58.2		66.1		63.6		1.6
Interorbital width	33.8	31.6		36.1		34.1		1.2
Orbital diameter	14.4	13.9		16.9		15.5		0.9
Lower lip width	61.3	49.5		61.7		56.7		4.1
Lower lip length	19.2	13.7		19.6		16.7		1.6
Mandibular ramus length	18.1	10.2		18.9		14.3		2.3
Maxillary barbel length	9.0	6.1		12.8		9.5		1.7

Other proportions
Orbital diameter in snout length	23.0	22.0		26.9		24.3		1.5
Orbital diameter in interorbital width	42.5	40.0		51.1		45.3		3.0
Mandibulary width in interorbital width	53.6	29.3		56.8		42.1		7.4
First dorsal fin ray length in predorsal length	55.7	49.8		60.6		55.8		2.6
First pectoral ray length in predorsal length	59.2	55.4		64.0		59.9		2.4
Lower caudal ray length in predorsal length	70.1	69.9		84.9		76.5		3.9
Adipose ray length in caudal peduncle depth	78.7	72.8		97.3		85.0		6.5
Caudal peduncle depth in Caudal peduncle length	30.3	27.5		33.2		30.5		1.5
Mandibulary width in cleithral width	19.2	11.5		22.1		16.1		2.6
Interdorsal length in dorsal base length	72.4	66.2		85.4		75.3		5.1
Lower lip length in lower lip width	31.3	24.0		33.0		29.4		2.3
	Counts
	Holotype		Low		High		Mode
Lateral series plates	24		23		25		24
Predorsal plates	3		3		3		3
Plates between dorsal and adipose fins	5		5		7		6
Plates between adipose and caudal fins	3		2		4		3
Plates below anal-fin base	2		2		3		2
Dorsal procurrent rays	5		4		5		5
Ventral procurrent rays	4		2		4		4
Premaxillary teeth	62		27		69		43
Dentary teeth	53		31		72		49

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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