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A large-scale investigation of warm water loricate choanoflagellate communities has revealed the presence of close to 80 species, which is approximately half of all loricate choanoflagellate taxa described when including also hitherto undescribed forms known to us. We are in the process of stepwise providing a monographic treatment of these communities. The overall aim is to contribute the best possible account of species diversity, based on traditional light and electron microscopical techniques, as a tool for future identification work based on microscopy, and in support of the work in progress with establishing a quality assured molecular tool for future recognition of diversity. In this paper we summarize our findings of species of Acanthocorbis and Stephanoeca, which include the description of several new taxa: A. conicella sp. nov., A. gladiella sp. nov., S. broomia sp. nov., S. naja sp. nov., and S. andemanica sp. nov., (Copyright © 2019 Elsevier GmbH. All rights reserved.)

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., (Copyright © 2016 Elsevier GmbH. All rights reserved.)