期刊
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
卷 97, 期 8, 页码 1675-1684出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S002531541600093X
关键词
pest polydorids; synonym; morphology; molecular sequence; mollusc aquaculture; alien
资金
- HB & MJ Thom and Oppenheimer Memorial Trust
- National Research Foundation (Thuthuka Programme)
- Stellenbosch University
- Ministry of Education, Science, Sports and Culture of Japan [15K07540]
- Grants-in-Aid for Scientific Research [15K07540] Funding Source: KAKEN
It is necessary to monitor shell-associated polydorid worms owing to the risk that they pose to commercially important molluscs. This requires accurate identification, but is often hampered by morphological similarities among species, insufficient type specimens, and abridged species descriptions. Thus morphological characteristics and molecular sequences of the most harmful polydorid species, Polydora uncinata from Japan and Australia and Polydora hoplura from South Africa were compared to determine whether they represent two morphologically similar, but genetically distinct species, or a single species. A wide range of morphological variation (with respect to size, length of caruncle and pigmentation patterns) was observed in each species and population, and their variations largely overlapped and revealed them to be at the intraspecific level of a single species. This was confirmed by gene sequences of nuclear 18S and 28S rRNA that were completely identical for P. uncinata and P. hoplura. The mitochondrial 16S rRNA and cyt b gene analyses also showed no genetic differences between these two species. The tree topology of the mitochondrial cyt b gene did not reflect geographic differences but instead suggests artificial transportation of the species. We recommend the synonymization of P. uncinata with P. hoplura.
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