Author/Editor		Utevsky, Serge Y; Utevsky, Andrei Y; Schiaparelli, Stefano; Trontelj, Peter
Title		Molecular phylogeny of pontobdelline leeches and their place in the descent of fish leeches (Hirudinea, Piscicolidae)
Type		članek
Source		Zool Scr
Vol. and No.		Letnik 36, št. 3
Publication year		2007
Volume		str. 271-80
Language		eng
Abstract		Phylogeneric relationships of all genera of the fish leech subfamily Pontobdellinae were investigated using mitochondrial (12S rDNA, COI, tRNA-Leu, ND1) and nucear (28S rDNA) DNA sequences under maximum likelihood, Bayesian inference and parsimony. All methods resulted in trees that corroborated the monophyly of the family Piscicolidae, but recovered their subfamily Pontobdellinae as non-monophyletic. Based on the basal position of the Giant Antarctic Megaliolbdella szidati, it is hypothesized that the putative ancestor of fish leeches was a free-ranging, large bodied, muscular leech. The next branch contains parasites of cartilaginous fishes, Pontobdella muricata and Pontobdellra macrothela. Two remaining genera of the subfamily (the Arctic Oxytonostoma and the Antarctic Moorebdellina) showed weak affinities to other piscicolid taxa. The obtained phylogenetic hypothesis suggests a possible transition from an ancestral free-ranging life style and temporary parasitism, to parasitism on cartilaninous fishes, followed by parasitism on bony fishes.
Descriptors		PHYLOGENY LEECHES ECOSYSTEM FISHES SEAWATER POLYMERASE CHAIN REACTION BAYES THEOREM