Alonso Miguel, Neretina Anna N, Sanoamuang La-Orsri, Saengphan Nukul, Kotov Alexey A
Ecology Section, Department of Evolutionary Biology, Ecology and Environmental Sciences, Faculty of Biology, University of Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain..
Zootaxa. 2019 Feb 8;4554(1):199-218. doi: 10.11646/zootaxa.4554.1.6.
A new species of Moina Baird, 1850 (Cladocera: Moinidae) is described based on material collected from Thailand (South-East Asia). In tropical Asia, Moina siamensis sp. nov. could be confused easily with M. weismanni Ishikawa, 1896, because of morphological similarities in parthenogenetic females and males of both species. The outstanding difference between these two taxa concerns the structure of the ephippium in gamogenetic females, which is highly visible under light and scanning electron microscopes. The mature ephippium of M. weismanni is strongly tuberous, with distinct borders between cells, whereas the ephippium of M. siamensis sp. nov. is significantly less tuberous, with prominent longitudinal lines in its central region. Since gamogenetic females only appear sporadically in moinid populations, distribution ranges of M. siamensis sp. nov., M. weismanni and sibling taxa must be clarified precisely using genetic markers in the future. Preliminary investigations of the ephippium structure may be useful for estimating the differences between populations, thus revealing much diversity within Moinidae.
基于从泰国（东南亚）采集的材料，描述了一种新的裸腹溞属（Moina Baird，1850）物种（枝角亚目：裸腹溞科）。在热带亚洲，由于暹罗裸腹溞（Moina siamensis sp. nov.）孤雌生殖的雌性和雄性与1896年的石川裸腹溞（M. weismanni Ishikawa）在形态上有部分相似之处，所以很容易混淆。这两个分类单元之间的显著差异在于两性生殖雌性的卵鞍结构，在光学显微镜和扫描电子显微镜下都能清晰看到。石川裸腹溞成熟的卵鞍有强烈的瘤状突起，细胞之间有明显的边界，而暹罗裸腹溞新物种的卵鞍瘤状突起明显较少，其中心区域有明显的纵向线条。由于两性生殖的雌性在裸腹溞种群中只是偶尔出现，未来必须使用遗传标记精确地阐明暹罗裸腹溞新物种、石川裸腹溞和近缘分类单元的分布范围。对卵鞍结构的初步研究可能有助于估计种群之间的差异，从而揭示裸腹溞科内部的多样性。
