{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T04:41:49Z","timestamp":1773290509600,"version":"3.50.1"},"reference-count":37,"publisher":"FapUNIFESP (SciELO)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Neotrop. ichthyol."],"abstract":"<jats:p>Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae. The analyzed species showed little amount of heterochromatin located preferentially in the centromeric and telomeric regions of some chromosomes. The nucleolus organizer regions activity (Ag-NORs) and the chromosomal location of ribosomal genes by fluorescent in situ hybridization (FISH), with 18S and 5S probes, showing only one chromosome pair marked bearer of ribosomal genes, the only exception was Pimelodus britskii that presented multiple NORs and syntenic location of the 18S and 5S probes. Non-Robertsonian events, as pericentric inversion and NORs duplication are requested to explain the karyotype diversification in Pseudoplatystoma from the rio Paraguay (MS), Pimelodus from the rio Igua\u00e7u (PR), Sorubim from the rio Paraguay (MS) and Steindachneridion from the rio Para\u00edba do Sul (SP). The obtained data for the karyotype macrostructure of these species corroborates a conserved pattern observed in Pimelodidae. On the other hand, interspecific variations detected by molecular cytogenetics markers made possible cytotaxonomic inferences and differentiation of the species here analyzed.<\/jats:p>","DOI":"10.1590\/s1679-62252011005000002","type":"journal-article","created":{"date-parts":[[2011,4,11]],"date-time":"2011-04-11T01:38:14Z","timestamp":1302485894000},"page":"97-105","source":"Crossref","is-referenced-by-count":18,"title":["Karyotype variability in neotropical catfishes of the family Pimelodidae (Teleostei: Siluriformes)"],"prefix":"10.1590","volume":"9","author":[{"given":"Am\u00e9rico","family":"Moraes Neto","sequence":"first","affiliation":[{"name":"Universidade Estadual de Ponta Grossa, Brazil"}]},{"given":"Maelin da","family":"Silva","sequence":"additional","affiliation":[{"name":"Universidade Estadual de Ponta Grossa, Brazil"}]},{"given":"Daniele Aparecida","family":"Matoso","sequence":"additional","affiliation":[{"name":"Instituto Nacional de Pesquisas da Amaz\u00f4nia, Brazil"}]},{"given":"Marcelo Ricardo","family":"Vicari","sequence":"additional","affiliation":[{"name":"Universidade Estadual de Ponta Grossa, Brazil"}]},{"given":"Mara Cristina de","family":"Almeida","sequence":"additional","affiliation":[{"name":"Universidade Estadual de Ponta Grossa, Brazil"}]},{"given":"Maria Jo\u00e3o","family":"Collares-Pereira","sequence":"additional","affiliation":[{"name":"Universidade de Lisboa, Portugal"}]},{"given":"Roberto Ferreira","family":"Artoni","sequence":"additional","affiliation":[{"name":"Universidade Estadual de Ponta Grossa, Brazil"}]}],"member":"530","published-online":{"date-parts":[[2011,2,4]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1007\/s11160-009-9109-2","article-title":"Karyotype diversity and fish conservation of southern field from South Brazil","volume":"19","author":"Artoni R. 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