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Integrative morphological, cytogenetic and molecular characterization of the Andean climbing catfish Astroblepus mindoensis (Regan, 1916) (Siluriformes:Astroblepidae).

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Title: Integrative morphological, cytogenetic and molecular characterization of the Andean climbing catfish Astroblepus mindoensis (Regan, 1916) (Siluriformes:Astroblepidae).
Authors: Nirchio, Mauro, Oliveira, Claudio, de Bello Cioffi, Marcelo, Sassi, Francisco M. C., Rizzi, Francisco Provenzano, Benavides, Santiago Wladimir Núñez, Berrones, Alison Jazmín Calderón, Romero, Juan Francisco Rivadeneira, Deon, Geize Aparecida, Kuranaka, Mariana, Valdiviezo‐Rivera, Jonathan Santiago, Carrión Olmedo, Julio C., Rossi, Anna Rita
Source: Journal of Fish Biology; Feb2025, Vol. 106 Issue 2, p292-304, 13p
Subject Terms: Cytogenetics, Morphology, Species, Endemic fishes, Biological classification, Genetic sex determination, DNA sequencing
Geographic Terms: Ecuador
Abstract: Astroblepus species, commonly known as Andean climbing catfish, exhibit a unique challenge in species delimitation, leading to ongoing taxonomic debates. Here we report data on Astroblepus mindoensis, a vulnerable species endemic to Ecuador, obtained by an integrative approach that includes cytogenetic analysis, molecular identification of the specimens, and recording of morphological and morphometric characters useful for species diagnosis. Thus, this study aimed to associate the karyotype data of the specimens analyzed with morphological and molecular characters, improving and expanding the existing taxonomic information, thus contributing to the systematics of the species. Our morphology results, unlike Regan's original description, which is brief and ambiguous, provide a more detailed morphometric and meristic description. Molecular phylogenetic reconstruction and genetic distance based on a fragment of the cytochrome c oxidase subunit I (COI) showed that our samples constitute a well‐supported and monophyletic clade within the A. grixalvii species complex. The cytogenetic analysis identified distinct chromosomal markers, including a single cluster of major ribosomal genes (on chromosome pair 3) and of minor ribosomal genes (on chromosome pair 12) with their localization differing from those reported in other Astroblepus species analyzed. Additionally, the presence of a heteromorphic chromosome pair in males suggests the presence of an XX/XY sex‐determination system that has not been identified in other congeneric species. Further investigation is necessary to determine if these chromosomes are associated with the accumulation of repeated sequences, as typically occurs with sex chromosomes, and to assess their presence in other species of the genus. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fish Biology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Complementary Index
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PubType: Academic Journal
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  Data: Integrative morphological, cytogenetic and molecular characterization of the Andean climbing catfish Astroblepus mindoensis (Regan, 1916) (Siluriformes:Astroblepidae).
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  Data: <searchLink fieldCode="AR" term="%22Nirchio%2C+Mauro%22">Nirchio, Mauro</searchLink><br /><searchLink fieldCode="AR" term="%22Oliveira%2C+Claudio%22">Oliveira, Claudio</searchLink><br /><searchLink fieldCode="AR" term="%22de+Bello+Cioffi%2C+Marcelo%22">de Bello Cioffi, Marcelo</searchLink><br /><searchLink fieldCode="AR" term="%22Sassi%2C+Francisco+M%2E+C%2E%22">Sassi, Francisco M. C.</searchLink><br /><searchLink fieldCode="AR" term="%22Rizzi%2C+Francisco+Provenzano%22">Rizzi, Francisco Provenzano</searchLink><br /><searchLink fieldCode="AR" term="%22Benavides%2C+Santiago+Wladimir+Núñez%22">Benavides, Santiago Wladimir Núñez</searchLink><br /><searchLink fieldCode="AR" term="%22Berrones%2C+Alison+Jazmín+Calderón%22">Berrones, Alison Jazmín Calderón</searchLink><br /><searchLink fieldCode="AR" term="%22Romero%2C+Juan+Francisco+Rivadeneira%22">Romero, Juan Francisco Rivadeneira</searchLink><br /><searchLink fieldCode="AR" term="%22Deon%2C+Geize+Aparecida%22">Deon, Geize Aparecida</searchLink><br /><searchLink fieldCode="AR" term="%22Kuranaka%2C+Mariana%22">Kuranaka, Mariana</searchLink><br /><searchLink fieldCode="AR" term="%22Valdiviezo‐Rivera%2C+Jonathan+Santiago%22">Valdiviezo‐Rivera, Jonathan Santiago</searchLink><br /><searchLink fieldCode="AR" term="%22Carrión+Olmedo%2C+Julio+C%2E%22">Carrión Olmedo, Julio C.</searchLink><br /><searchLink fieldCode="AR" term="%22Rossi%2C+Anna+Rita%22">Rossi, Anna Rita</searchLink>
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  Data: Journal of Fish Biology; Feb2025, Vol. 106 Issue 2, p292-304, 13p
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Cytogenetics%22">Cytogenetics</searchLink><br /><searchLink fieldCode="DE" term="%22Morphology%22">Morphology</searchLink><br /><searchLink fieldCode="DE" term="%22Species%22">Species</searchLink><br /><searchLink fieldCode="DE" term="%22Endemic+fishes%22">Endemic fishes</searchLink><br /><searchLink fieldCode="DE" term="%22Biological+classification%22">Biological classification</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+sex+determination%22">Genetic sex determination</searchLink><br /><searchLink fieldCode="DE" term="%22DNA+sequencing%22">DNA sequencing</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Ecuador%22">Ecuador</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Astroblepus species, commonly known as Andean climbing catfish, exhibit a unique challenge in species delimitation, leading to ongoing taxonomic debates. Here we report data on Astroblepus mindoensis, a vulnerable species endemic to Ecuador, obtained by an integrative approach that includes cytogenetic analysis, molecular identification of the specimens, and recording of morphological and morphometric characters useful for species diagnosis. Thus, this study aimed to associate the karyotype data of the specimens analyzed with morphological and molecular characters, improving and expanding the existing taxonomic information, thus contributing to the systematics of the species. Our morphology results, unlike Regan's original description, which is brief and ambiguous, provide a more detailed morphometric and meristic description. Molecular phylogenetic reconstruction and genetic distance based on a fragment of the cytochrome c oxidase subunit I (COI) showed that our samples constitute a well‐supported and monophyletic clade within the A. grixalvii species complex. The cytogenetic analysis identified distinct chromosomal markers, including a single cluster of major ribosomal genes (on chromosome pair 3) and of minor ribosomal genes (on chromosome pair 12) with their localization differing from those reported in other Astroblepus species analyzed. Additionally, the presence of a heteromorphic chromosome pair in males suggests the presence of an XX/XY sex‐determination system that has not been identified in other congeneric species. Further investigation is necessary to determine if these chromosomes are associated with the accumulation of repeated sequences, as typically occurs with sex chromosomes, and to assess their presence in other species of the genus. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fish Biology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=edb&AN=184019437
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/jfb.15924
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 292
    Subjects:
      – SubjectFull: Ecuador
        Type: general
      – SubjectFull: Cytogenetics
        Type: general
      – SubjectFull: Morphology
        Type: general
      – SubjectFull: Species
        Type: general
      – SubjectFull: Endemic fishes
        Type: general
      – SubjectFull: Biological classification
        Type: general
      – SubjectFull: Genetic sex determination
        Type: general
      – SubjectFull: DNA sequencing
        Type: general
    Titles:
      – TitleFull: Integrative morphological, cytogenetic and molecular characterization of the Andean climbing catfish Astroblepus mindoensis (Regan, 1916) (Siluriformes:Astroblepidae).
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              Text: Feb2025
              Type: published
              Y: 2025
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