A new unicuspid-toothed species of <i>Hypostomus  </i>Lacépède, 1803 (Siluriformes: Loricariidae) from the rio Paraguai basin

Zawadzki, Claudio H.; Tencatt, Luiz F. C.; Froehlich, Otávio

doi:10.1590/S1679-62252014000100010

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Article • Neotrop. ichthyol. 12 (01) • Jan-Mar 2014 • https://doi.org/10.1590/S1679-62252014000100010 linkcopy

A new unicuspid-toothed species of Hypostomus Lacépède, 1803 (Siluriformes: Loricariidae) from the rio Paraguai basin

Authorship SCIMAGO INSTITUTIONS RANKINGS

A new unicuspid-toothed armored catfish species of Hypostomus is described from the Bodoquena Plateau, rio Paraguai basin, Mato Grosso do Sul State, Brazil. The new species is distinguished from its congeners, with exception of H. fonchii, by having unicuspid teeth (vs. bicuspid teeth); from H. fonchii it is distinguished by having median series of lateral plates with 26-27 (vs. 28); by lower number of premaxillary and dentary teeth (7-10 vs. 18-21; 8-13 vs. 18-25, respectively); for possessing more depressed head (head depth 15.8-18.1% SL vs. 19.1-22.0% SL); and by the presence of median buccal papilla (vs. absence).

Armored catfish; Bodoquena Plateau; Cascudo; Hypostominae; Taxonomy

	Holotype	Range	Mean/SD
Standard length	159.1	137.3-171.3	154.6	± 10.1
Percents of standard length
Predorsal length	37.0	36.1-39.2	37.7	± 0.9
Head length	30.1	28.7-31.6	30.4	± 0.8
Cleithral width	25.9	25.9-27.9	27.1	± 0.6
Head depth	16.8	15.8-18.1	17.0	± 0.7
Interdorsal length	16.3	14.9-18.7	16.5	± 0.9
Thoracic length	21.3	17.4-25.1	20.9	± 0.9
Abdominal length	24.1	21.7-25.3	23.5	± 0.9
Dorsal-fin spine length	26.1	23.4-29.7	26.8	± 1.6
Pectoral-fin spine length	26.6	26.2-29.0	27.7	± 0.7
Pelvic-fin unbranched ray length	23.4	23.0-26.2	24.7	± 0.8
Caudal-peduncle length	34.3	30.0-35.8	33.5	± 1.1
Caudal-peduncle depth	9.0	8.6-10.1	9.3 ± 0.3
Percents of head length
Cleithral width	89.8	84.3-94.8	89.4	± 2.4
Head depth	55.7	52.3-60.2	56.0	± 2.0
Snout length	63.5	60.2-67.4	62.8	± 1.6
Orbital diameter	15.7	15.1-17.8	16.1	± 0.6
Interorbital width	36.7	32.7-39.3	36.1	± 1.8
Mandibullary width	13.2	13.2-18.4	15.6	± 1.4
Other percents
Orbital diameter in snout length	24.7	24.7-27.1	25.8 ± 1.0
Orbital diameter in interorbital width	42.6	42.6-47.3	44.8 ± 2.0
Mandibullary width in interorbital width	35.8	35.8-46.9	40.5 ± 5.0
First dorsal-fin spine length in predorsal length	70.6	69.7-75.4	71.5 ± 2.7
First pectoral-fin spine length in predorsal length	72.1	72.1-75.4	74.3 ± 1.5
Lower caudal-fin unbranched ray length in predorsal length	85.2	81.2-88.3	85.2 ± 3.0
Adipose-fin spine length in caudal-peduncle depth	96.5	96.5-105.9	99.7 ± 4.2
Caudal-peduncle depth in caudal-peduncle length	26.2	26.2-29.1	27.5 ± 1.2
Mandibullary width in cleithral width	14.7	14.7-19.2	16.4 ± 2.0
Interdorsal length in dorsal-fin base length	67.7	62.7-73.3	67.9 ± 4.6
Lower lip width in lower lip length	35.5	31.1-42.6	36.0 ± 4.8
Counts	Holotype	Range	Mode
Median plate series	26	26-27	26
Predorsal plates	3	3		3
Plates bordering supraoccipital	1	1		1
Dorsal plates below dorsal-fin base	7	7		7
Plates between dorsal and adipose fin	8	6-8		7
Plates between adipose and caudal fin	7	7-8		7
Plates between anal-fin base and caudal fin	11	11	11
Premaxillary teeth	8	7-10		9
Dentary teeth	8	8-13	10

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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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