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

Abstract

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).Uma espécie nova de cascudo do gênero Hypostomus com dentes unicuspidados é descrita da Serra da Bodoquena, bacia do rio Paraguai, estado do Mato Grosso do Sul, Brasil. A espécie nova é distinta de suas congêneres, com exceção de H. fonchii, pela presença de dentes unicuspidados (vs. bicuspidados); de H. fonchii é distinta por apresentar a série mediana de placas laterais com 26-27 (vs. 28); pelo menor número de dentes pré-maxilares e no dentário (7-10 vs. 18-21; 8-13 vs. 18-25, respectivamente); por possuir cabeça mais deprimida (altura da cabeça 15.8-18.1% CP vs. 19.1-22.0% CP) e pela presença de papilas bucais medianas (vs. ausência).

Comparative Cytogenetics Among Three Sympatric Hypostomus Species (Siluriformes: Loricariidae): An Evolutionary Analysis in a High Endemic Region

“…Hypostomus plecostomus (Linnaeus, 1758) was described with 2n = 54 chromosomes 48 . However, it was considered a misidentification case, once the recent cytogenetic studies in this species has demonstrated 2n = 68 chromosomes 49 [11][12][13]50 . The chromosomal data in this study showed that 2n = 68 and different karyotype formulae between H. commersoni and H. derbyi could be explained by pericentric inversions.…”

Karyotypic diversity of the armoured catfish genus Hypostomus (Siluriformes: Loricariidae) in the context of its occurrence and distribution

“…Hypostomus Lacépède is the most diverse genus of Loricariidae and it is currently composed of 132 valid species (Zawadzki & Hollanda Carvalho, ; Zawadzki et al , ). With regard to the cytogenetic contribution to the taxonomic and evolutionary understanding of Hypostomus , Artoni & Bertollo (, ) were pioneers in this field and their studies are widely cited as references on the subject.…”

Karyotype structure of Hypostomus cf. plecostomus (Linnaeus, 1758) from Tapajós River basin, Southern Amazon: occurrence of sex chromosomes (ZZ/ZW) and their evolutionary implications

“…Loricariidae is the family with the largest number of representatives of this order, which is popularly known as plecos or catfish. The genus Hypostomus is considered one of the most taxonomically complex of Neotropical ichthyofauna, which currently comprises 130 valid species (Zawadzki et al, 2014) showing great diversity in the morphology and color pattern and thereby making identification of certain species difficult .…”