A new dark-dotted species of <i>Hypostomus</i> Lacépède (Siluriformes: Loricariidae) from rio Paraguaçu, Bahia State, Brazil

Zanata, Angela M.; Sardeiro, Byanca; Zawadzki, Cláudio H.

doi:10.1590/S1679-62252013000200002

Brazil

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Original Articles • Neotrop. ichthyol. 11 (2) • June 2013 • https://doi.org/10.1590/S1679-62252013000200002 linkcopy

A new dark-dotted species of Hypostomus Lacépède (Siluriformes: Loricariidae) from rio Paraguaçu, Bahia State, Brazil

SCIMAGO INSTITUTIONS RANKINGS

Abstracts

A new species of Hypostomus Lacépède is described from the rio Paraguaçu basin, Bahia State, Brazil. The new species is distinguished from its congeners by having black and conspicuous dots on a pale background, which are similar in size on the head, trunk, and fins, along with ventral surface of head and abdomen naked or the latter plated exclusively on its anterior portion, absence of ridges on head and trunk, and caudal-fin lobes relatively similar in length. The new species further differs from the sympatric H. chrysostiktos by having seven branched dorsal-fin rays instead of 10-11 and represents the eleventh siluriform species endemic to the rio Paraguaçu basin.

Coastal drainages; Hypostominae; Hypostomus chrysostiktos; Northeastern Brazil; Taxonomy

	Holotype	N	Range	Mean	SD
Total length in mm	-	12	95.0-238.5	-	-
Standard length in mm	164.8	27	68.8-175.6	-	-
Percents of standard length
Predorsal length	40.0	27	38.7-42.9	40.2	1.1
Preanal length	64.0	27	63.4-67.6	65.3	1.2
Head length	31.8	27	31.4-35.9	33.3	1.3
Interdorsal length	16.9	26	13.3-17.6	15.0	1.1
Pectoral-pelvic length	22.8	27	22.0-25.1	23.4	0.7
Pelvic-anal length	23.1	27	19.7-23.6	22.4	0.9
Caudal peduncle length	33.0	27	29.7-33.4	31.6	1.0
Caudal peduncle depth	10.4	27	9.5-11.0	10.7	0.3
Dorsal-fin spine length	29.7	13	29.5-33.2	31.3	1.3
Adpressed dorsal-fin length	38.6	27	36.6-44.3	41.6	1.9
Dorsal-fin base length	22.3	27	22.3-26.6	25.0	1.1
Anal-fin spine length	10.0	25	8.4-11.1	10.0	0.7
Anal-fin base length	3.2	27	2.4-4.2	3.5	0.4
Pectoral-fin spine length	30.8	23	29.5-33.8	31.4	1.3
Pelvic-fin spine length	23.8	26	23.6-27.2	25.7	0.9
Upper caudal-fin ray length	-	5	28.8-33.8	31.4	2.1
Lower caudal-fin ray length	-	12	31.9-42.1	36.9	3.5
Adipose-fin spine length	9.0	27	7.1-10.1	8.7	0.7
Cleithral width	29.4	27	28.9-31.9	30.2	0.7
Body depth	21.1	27	17.7-21.7	19.9	1.0
Percents of head length
Head depth	57.3	27	49.7-57.9	54.3	2.5
Snout length	62.6	27	61.4-67.5	63.8	1.6
Snout-opercle distance	73.5	27	70.1-76.8	73.1	1.9
Interorbital width	37.6	27	32.9-39.0	36.6	1.4
Orbital diameter	14.3	27	11.4-15.9	13.4	1.1
Mouth width	56.5	27	50.5-59.6	54.9	2.1
Mandibular ramus length	17.0	27	15.1-20.1	17.7	1.2
Premaxillar ramus length	18.1	27	15.4-19.8	18.0	1.0
Maxillary barbel length	12.2	27	8.5-16.3	11.7	1.8

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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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