The first detection of DNA of Caryophyllaeus laticeps (Pallas, 1781) in sunbleak Leucaspius delineatus (Heckel, 1843)

Abstract

Abstract. DNA of Caryophyllaeus laticeps (Pallas, 1781) (Cestoda: Caryophyllidea) was first found in the intestine of common sunbleak Leucaspius delineatus (Heckel, 1843) from the Irkutsk Reservoir. The aim of the study was to carry out a comparative analysis and reconstruction of the phylogenetic position of the parasite. Determination of the cox1 gene fragment and comparative analysis of the obtained and available in genetic databases nucleotide sequences showed high nucleotide diversity of C. laticeps both in the studied samples (0 6.4%) and in the reference sequences from the GenBank database (0 6.8%). The sequences of C. laticeps in the phylogenetic tree formed three clades containing local samples of sunbleak parasites in all of them. The most represented genotype (75%) is clustered with parasite sequences of the bream Abramis brama (Linnaeus, 1758) from Switzerland, Slovakia, and the European part of Russia. Another significant genotype (19%) is in the joint cluster with the C. laticeps sequences of the common carp Cyprinus carpio Linnaeus, 1758 (Italy). The need for additional studies on the biology and ecology of C. laticeps and revision of caryophyllid cestodes in fish in the Angara River and Lake Baikal were under consideration.