с) KULLANDER (CLoFFSCA, 2003) - ...The nominal species H. severus (common, non-mouthbrooder) has wide distribution and may claim to be an ancestor of aquarium severum. ....
Is that true? I don`t think so. Kullander wrote in that paper about its distribution this: Heros severus
Heckel 1840; 362
. Type locality: bei Marabitanas, in Rio Negro. Syntypes:
?NMW 17354(1), ?17638(1), ?17656(1). Distribution:
Orinoco River basin; in the upper Orinoco River drainage in Colombia and Venezuela; Amazon River basin in the upper Negro River basin. Countries: Brazil, Venezuela, Colombia.
That is correct, isn`t it?
Reference: http://books.google.si/books?id=9tiDHrz ... os&f=false
= 2003 Check list of the freshwater fishes of South and Central America - Roberto E. Reis, Sven O. Kullander, Carl J. Ferraris, Pontifícia Universidade Católica do Rio Grande do Sul.
Porto Alegre, RS. Brasil.
Change in habit, producing change of function, is the main cause of the production of change in living structure. F. Wood Jones (1953) Trends of life