Karyoevolution of the toadfish Thalassophryne nattereri (Batrachoidiformes: Batrachoididae)

G.W.W.F. Costa, W.F. Molina 
Published: September 08, 2009
Genet. Mol. Res. 8 (3) : 1099-1106
DOI: https://doi.org/10.4238/vol8-3gmr640

Cite this Article:
G.W.W.F. Costa, W.F. Molina (2009). Karyoevolution of the toadfish Thalassophryne nattereri (Batrachoidiformes: Batrachoididae). Genet. Mol. Res. 8(3): 1099-1106. https://doi.org/10.4238/vol8-3gmr640

About the Authors
G.W.W.F. Costa, W.F. Molina

Corresponding Author
W.F. Molina 
E-mail: molinawf@yahoo.com.br

The Batrachoididae includes some venomous brackish and marine fish found in the Atlantic, Indian and Pacific oceans. This family is composed of 69 species, distributed among 19 genera. Species of the genus Thalassophryne have been reported along the coast of Rio Grande do Norte (Brazil); T. nattereri has been responsible for a large number of human injuries. Little is known about the cytogenetic features of this family. We made a karyotypic characterization of T. nattereri col­lected from the estuary of the Apodi/Mossoró River, using conventional Giemsa staining, C-banding and silver nitrate-nucleolar organizer region technique. There was a modal diploid value of 2n = 46 chromosomes (8m + 8sm + 24st + 6a; fundamental number = 86). Single ribosomal sites were detected in the terminal region on short arms of a subtelocen­tric pair (19th). Heterochromatin segments were preferentially located over centromeric regions in some chromosome pairs. Pericentric inver­sions and Robertsonian rearrangements seem to have played a major role in karyotype evolution within this genus of toadfish.
Key words:  fish cytogenetics, Pericentric inversion, Toadfish, Thalassophryne, Venomous fish.

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