Martens Koen, Shribak Michael, Arkhipova Irina, Schön Isa
Royal Belgian Institute of Natural Sciences, Freshwater Biology, Vautierstraat 29, Brussels 1000, Belgium.
Ghent University, Department of Biology, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium.
Belg J Zool. 2023 Jan 5;153:15-34. doi: 10.26496/bjz.2023.107. Epub 2023 Jan 19.
The common non-marine ostracod (O.F. Müller, 1776) is used as a proxy in various biological disciplines, such as (palaeo-)ecology, evolutionary biology, ecotoxicology and parasitology. This morphospecies was considered to be an obligate parthenogen. We report on the discovery of the first population of with males from Woods Hole (MA, USA) and determine that it is a population with mixed reproduction. We describe the morphology of the males and of the sexual and asexual females. We illustrate a copula of a male and a sexual female as well insemination in a sexual female, showing that males are functional. Therefore, is a morphospecies with mixed reproduction, not a full apomictic parthenogen. We use, for the first time, polychromatic polarization microscope technology to illustrate soft parts of ostracods. In addition, we compare the sexual species , , and and conclude that these species, especially the latter three, are morphologically very close to .
常见的淡水介形虫（O.F. 米勒，1776年）在各种生物学学科中被用作替代物，如（古）生态学、进化生物学、生态毒理学和寄生虫学。这个形态物种曾被认为是专性孤雌生殖的。我们报告了在美国马萨诸塞州伍兹霍尔首次发现有雄性的该物种群体，并确定这是一个具有混合生殖方式的群体。我们描述了雄性以及有性和无性雌性的形态。我们展示了雄性与有性雌性的交配以及有性雌性的受精过程，表明雄性具有功能。因此，该物种是一个具有混合生殖方式的形态物种，而非完全无融合生殖的孤雌生殖物种。我们首次使用多色偏振显微镜技术来展示介形虫的软组织。此外，我们比较了有性物种、、和，并得出结论，这些物种，尤其是后三种，在形态上与非常接近。
