Vol. 47 No. 5, 2008
A Molecular Phylogenetic Investigation of Cyathopoma (Prosobranchia: Cyclophoridae) in East Asia
Yen-Chen Lee1,2, Kuang-Yang Lue1, and Wen-Lung Wu2,*
1Department of Life Science, National Taiwan Normal University, Taipei 106, Taiwan
2Biodiversity Research Center, Academia Sinica, Nankang, Taipei 115, Taiwan
Yen-Chen Lee, Kuang-Yang Lue, and Wen-Lung Wu (2008)
The Cyclophoridae is the dominant group of operculated terrestrial
snails in East Asia. The group consists of 4 subfamilies and
about 300 species currently arranged in 34 genera. They occupy a
range of habitats and exhibit considerable morphological
diversity. Members of Cyathopoma
are tiny white cyclophorid snails occurring in East Asia, Madagascar,
and the Seychelles. The phylogenetic relationships of Cyathopoma are uncertain. In order to investigate the relationships among cyclophorids and within East Asian Cyathopoma
species, we sequenced part of the mitochondrial cytochrome oxidase
subunit I (COI) gene from 31 species of 9 genera of cyclophorids.
We constructed phylogenetic trees using Neighbor-joining, Bayesian, and
maximum-likelihood analyses. Phylogenetic relationships based on
mitochondrial (mt)DNA sequences suggested that Cyclophorus, Cyclotus, Leptopoma, and Platyrhaphe are monophyletic. Combined with molecular and radular data, we concluded that Cyathopoma and Cyclotus are only distantly related. Cyathopoma iota has been considered to be a controversial member of this group. Through molecular and radular data, we found Cya. iota to be closer to Cya. taiwanicum than to Cya. micron, and concluded that Cya. micron, Cya. ogaitoi, Cya. iota, and Cya. taiwanicum belong to Cyathopoma. In addition we provide the first report of Cya. ogaitoi from Guizhou Province, China.
Key words: Phylogeny, Cyathopoma, Cyclophoridae, East Asia, New record.