Contribution to the phylogeny of pangasiid catfishes based on allozymes and mitochondrial DNA

Abstract

Phylogenetic inferences based on molecular data provide support for the recognition of some Pangasius subgenera and, or species groups as distinct genera. It is suggested that Pangasiidae and Schilbeidae have diverged from a common ancestor probably since late Miocene. Moreover, the data provide evidence for the existence of two distinct episodes of speciation in Pangasiidae. The most ancient occurred in the middle Miocene and concerned emergence of the different genera, while the second referred to an intense speciation event in the genus Pangasius, probably between the early Miocene and the late Pliocene. Finally, this study revealed the existence of two new species of Pangasius.

Mitochondrial COI Gene Sequence Analyses of Puntius ticto and Compared with Seven Species of Genus Puntius of Family Cyprinidae: A Finding for Phylogenetic Positioning and DNA Barcoding as Model Study for Cryptic Species

“…5 polymorphism was observed within or among individuals from five sampled Puntius ticto populations of M. P. Statistical models for the evolution of molecular sequences play an important role in the study of evolutionary processes. For the evolutionary analysis of proteincoding (3) sequences, 3 types of evolutionary models are available: (1) nucleotide, (2) amino acid, and codon substitution models.…”

“…Complementing taxonomic descriptions with the knowledge from molecular tools such as mitochondrial DNA sequences [1][2][3] is now considered relevant to understand the phylogenetic relationships and the precise systematic of taxons and description of biodiversity [4][5][6]. Assessing biodiversity depends not only on the organization of organisms into taxonomic units, but also on understanding the phylogenetic relatedness of these taxonomic units [7].…”

Population Genetic Structure of Endemic and Endangered Yellow Catfish, Horabagrus brachysoma, Using Allozyme Markers

“…The mean value of n a in H. brachysoma (2.357) exceeded that of many freshwater species, such as Tenualosa ilisha (1.49; Lal et al 2004) and Cirrhinus mrigala (1.31; Singh et al 2004). Slightly lower values were reported in other catfish species, such as Clarias gariepinus, C. anguillaris, and C. albopunctatus (Rognon et al 1998), and in pangasiid catfishes (Pouyaud et al 2000). Observed heterozygosity (H o ) and expected heterozygosity (H e ) at all 14 polymorphic loci were 0.178 and 0.428, respectively (Table 2).…”

Monogeneans from Pangasiidae (Siluriformes) in Southeast Asia: VIII. Four new species ofThaparocleidusJain, 1952 (Ancylodiscoididae) fromPangasius polyuranodonandP. elongatus

“…T. brevicochleus, initially described from P. humeralis in the Kapuas River, was found only on P. polyuranodon from the Barito River. As these two host species are not closely related (see Pouyaud et al, 2000) and as the two rivers basins are well separated on Borneo Island, no conclusions are possible on whether these has been recent lateral transfer or coevolution of parasites and hosts. Some of the new species described above have morphometrical differences according to the location [Vietnamese population of T. sudartoi; population of T. infundibulus from Kalimantan (Indonesian part of Borneo) ; Malaysian population of T. turbinatio].…”