Thomsen Helge Abildhauge, Østergaard Jette Buch
National Institute of Aquatic Resources, Technical University of Denmark, Charlottenlund, Denmark.
Nørrebrogade 52a 5th, 2200 Copenhagen N, Denmark.
Eur J Protistol. 2017 Apr;58:26-34. doi: 10.1016/j.ejop.2016.12.004. Epub 2016 Dec 27.
Sex is found in all major eukaryotic groups of organisms. It has been known for some time that the choanoflagellates also possess the genes involved in meiosis and a full sexual cycle was also recently accounted for in Salpingoeca rosetta. With reference to the loricate choanoflagellates the current status is that only circumstantial evidence, from wild material of Bicosta spinifera, exists in favour of documenting division patterns that go beyond plain asexual division, and that has the potential to represent stages in a sexual life cycle. Here we present further evidence from wild material documenting possible morphotype changes that might similarly indicate the existence of complex life cycles. In this particular case, it revolves around the existence of so-called 'combination loricas' (i.e. two loricas that occur physically united), representing consistent species combinations from the genera Acanthocorbis and Stephanoeca.
性别存在于所有主要的真核生物类群中。人们早就知道，领鞭毛虫也拥有参与减数分裂的基因，并且最近在玫瑰领鞭虫中也发现了完整的有性生殖周期。关于有壳领鞭毛虫，目前的情况是，仅从多刺双肋领鞭虫的野生样本中获得了一些间接证据，表明存在超越简单无性分裂的分裂模式，并且有可能代表有性生活周期中的各个阶段。在此，我们展示了来自野生样本的进一步证据，记录了可能的形态型变化，这些变化同样可能表明存在复杂的生命周期。在这个特定案例中，它围绕着所谓的“组合外壳”（即两个在物理上结合在一起的外壳）的存在展开，这些组合代表了棘杯虫属和斯蒂芬虫属之间一致的物种组合。
