| General information |
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Kronichthys lacerta (Nichols, 1919) |
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| Synonyms |
Kronichthys lacerta (Nichols, 1919) Plecostomus lacerta Nichols, 1919 |
| IUCN Red List status (2014) |
Not Reported |
| Habitat |
Freshwater |
| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Siluriformes; Loricariidae. |
| Geographical distribution |
Brazil |
| Occurrence |
native: Brazil |
| Importance |
Food |
| Karyological information |
| Record 1 |
| Geographical area of study |
Acungui River (PR), Ribeira River Basin, Brazil. |
| Source of chromosomes |
Not reported |
| Number of specimens with sex |
35 (17 males; 18 females) |
| Diploid chromosome number |
54 |
| Karyotype formula |
22m+22sm+10st |
| Fundamental arm number |
108 |
| Chromosome length |
Not reported |
| Sex chromosome |
ZZ/ZW |
| Chromosome staining/banding/FISH |
Heterochromatin located at pericentromeric region of chromosomes 12, 23 and 25, at distal region of pair 23 and in faint blocks of other chromosomes. A heterochromatin heteromorphism was observed on long arms of just one homologue of the pair 24, restricted to females, suggesting the presence of a ZZ/ZW sex chromosome system. AgNOR located at interstitial region on long arms of the st pair 23. The 18S and 5S rDNAs were located in syntenic and adjacent. rDNA present in st pair 23, with interstitial 18S rDNA and distal 5SrDNA on long arms. |
| Reference |
Ziemniczak K , Barros AV ,Rosa KO , Nogaroto V , Almeida MC,Cestari MM, Filho OM , Artoni RF, Vicari MR (2012). Comparative cytogenetics of Loricariidae (Actinopterygii: Siluriformes): Emphasis in Neoplecostominae and Hypoptopomatinae, Italian Journal of Zoology, 79:4, 492-501. |
| Record 2 |
| Geographical area of study |
Marumbi River, Brazil. |
| Source of chromosomes |
Kidney tissues. |
| Number of specimens with sex |
- |
| Diploid chromosome number |
54 |
| Karyotype formula |
20m+20sm+14st |
| Fundamental arm number |
- |
| Chromosome length |
- |
| Sex chromosome |
- |
| Chromosome staining/banding/FISH |
Single 18S rDNA signal observed in interstitial position of long arm of st chromosome pair 21. Large size polymorphism of the 18S rDNA loci suggests a duplication of this gene in the active Ag-NOR chromosome. |
| Reference |
Alves AL, de Borba RS, Pozzobon APB, Oliveira C, Nirchio M, Granado A, Foresti F. (2012). Localization of 18S ribosomal genes in suckermouth armoured catfishes Loricariidae (Teleostei, Siluriformes) with discussion on the Ag-NOR evolution. Comp. Cytogen. 6(3): 315–321. |
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