Taxonomic Study of the Burmoniscus ocellatus Complex (Crustacea, Isopoda, Oniscidea) in Japan Shows Genetic Diversification in the Southern Ryukyus, Southwestern Japan
Taxonomic Study of the Burmoniscus ocellatus Complex (Crustacea, Isopoda, Oniscidea) in Japan Shows Genetic Diversification in the Southern Ryukyus, Southwestern Japan
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DOI：
10.2108/zsj.29.527
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发表时间：
2012-08-01
影响因子：
0.9
通讯作者：
Honda, Masanao
中科院分区：
文献类型：
--
作者：
Karasawa, Shigenori;Honda, Masanao
为了明确日本Burmoniscus ocellatus复合体的分类地位，我们对在琉球南部的Yonagunijima、Iriomotejima、Ishigakijima和Miyakojima群岛和日本西南部琉球中部的冲绳岛采集的标本进行了形态学观察和系统发育分析。对Aphiloscia iriomotensis （nunura, 1986）、Ap. ishigakiensis （nunura, 1986）和Ap. yonakuniensis （nunura, 1986）的全型观察，以及在五个岛屿新采集的标本，表明这些标本属于Burmoniscus属。对从5个岛屿采集的268个标本的5个形态特征分析表明，冲绳岛标本的体型明显小于琉球南部标本。与那原岛、衣本岛、石垣岛和宫古岛标本的5种形态特征分布范围有重叠的趋势；这些形态特征与B. ocellatus一致（Verhoeff, 1928）。基于线粒体dna coi、12S rRNA和16S rRNA三个区域的系统发育分析表明，从琉球南部采集的标本构成了一个单系群，与冲绳岛标本组成的进化支明显不同。这些结果有力地表明，在琉球南部广泛分布的一种鱼种，ap.iriomotensis、ap.ishigakiensis和ap.yonakuniensis与B. ocellatus同义。另一方面，来自琉球中部冲绳岛的种被认为是一个未被描述的Burmoniscus种，与B. ocellatus关系密切，但明显不同。
To clarify the taxonomic status of the Burmoniscus ocellatus complex in Japan, we carried out morphological observations and phylogenetic analyses of specimens collected from Yonagunijima, Iriomotejima, Ishigakijima, and Miyakojima Islands of the southern Ryukyus and from Okinawajima Island of the central Ryukyus in southwestern Japan. Observations of the holotypes of Aphiloscia iriomotensis (Nunomura, 1986), Ap. ishigakiensis (Nunomura, 1986), and Ap. yonakuniensis (Nunomura, 1986), in addition to the specimens newly collected from the five islands, indicated that these specimens belong to the genus Burmoniscus. Analyses of five morphological characters of 268 specimens collected from the five islands showed that the body size of Okinawajima specimens is distinctly smaller than those of the specimens from the southern Ryukyus. The ranges of the five morphological characters tended to overlap among the specimens from Yonagunijima, Iriomotejima, Ishigakijima and Miyakojima Islands; these morphological characters were congruent with those of B. ocellatus (Verhoeff, 1928). The phylogenetic analyses were based on three regions of mitochondrial DNA-COI, 12S rRNA, and 16S rRNA-and indicated that the specimens collected from the southern Ryukyus constitute a monophyletic group, which is clearly distinct from the clade composed of the Okinawajima specimens. These results strongly suggest that Ap. iriomotensis, Ap. ishigakiensis, and Ap. yonakuniensis are synonymous with B. ocellatus, a species widely distributed in the southern Ryukyus. On the other hand, the species from Okinawajima Island in the central Ryukyus is considered to be an undescribed Burmoniscus species, which is closely related to but clearly distinct from B. ocellatus.