title: Taxonomic revision of Aegistasubchinensis (Möllendorff, 1884) (Stylommatophora, Bradybaenidae) and a description of a new species of Aegista from eastern Taiwan based on multilocus phylogeny and comparative morphology.
abstract: Aegistasubchinensis (Möllendorff, 1884) is a widely distributed land snail species with morphological variation and endemic to Taiwan. Three genetic markers (partial sequence of the mitochondrial cytochrome c oxidase subunit I [COI], the 16S rDNA and the nuclear internal transcribed spacer 2 [ITS2]) were analysed to infer phylogenetic relationships and genetic divergence of closely related species of the genus Aegista, Aegistavermis (Reeve, 1852) and Aegistaoculus (Pfeiffer, 1850). A new species from Aegistasubchinensis has been recognized on the basis of phylogenetic and morphological evidences. The nominal new species, Aegistadiversifamilia sp. n. is distinguished from Aegistasubchinensis (Möllendorff, 1884) by its larger shell size, aperture and apex angle; wider umbilicus and flatter shell shape. The northernmost distribution of Aegistadiversifamilia sp. n. is limited by the Lanyang River, which is presumed to mark the geographic barrier between Aegistadiversifamilia sp. n. and Aegistasubchinensis.
authors.affiliation: Department of Life Science, National Taiwan Normal University, 88 Ting-Chow Rd, Sec 4, Taipei, 11677 Taiwan.
authors.forename: Chih-Wei
authors.initials: CW
authors.lastname: Huang
authors.affiliation: Biodiversity Research Center, Academia Sinica, 128 Academia Road Sec. 2, Nankang Taipei 11529 Taiwan.
authors.forename: Yen-Chen
authors.initials: YC
authors.lastname: Lee
authors.affiliation: Department of Life Science, National Taiwan Normal University, 88 Ting-Chow Rd, Sec 4, Taipei, 11677 Taiwan.
authors.forename: Si-Min
authors.initials: SM
authors.lastname: Lin
authors.affiliation: Biodiversity Research Center, Academia Sinica, 128 Academia Road Sec. 2, Nankang Taipei 11529 Taiwan.
authors.forename: Wen-Lung
authors.initials: WL
authors.lastname: Wu
keywords: Helicoidea; Southern Ryukyu Islands; Stylommatophora; Yaeyama Islands; new species