Loricate choanoflagellates (Acanthoecida) from warm water seas. III. Acanthocorbis Hara and Takahashi and Stephanoeca Ellis

Abstract

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.,

Heterotrophic flagellates and centrohelid heliozoans from marine waters of Curacao, the Netherlands Antilles

“…Remarks: Morphology and size of observed cells corresponds with previous descriptions: lorica length is 9-18 μm (Hara et al 1996;Thomsen and Østergaard 2019); lorica width is 4.5-10 μm (Hara et al 1996); number of longitudinal costae is 7-20 (Hara et al 1996;Lee et al 2003).…”

“…This species close resembles A. apoda (Leadbeater, 1972) Hara et Takahashi, 1984 by the presence of a double transverse rib, absence of stalk, as well as the presence of "empty space" between the transverse ribs of anterior and posterior chambers (Leadbeater 1972). However, A. camarensis can be distinguished by shorter distance between anterior transverse costa and the lorica waist (less than length of one longitudinal costal strip), and presence of additional helical costal elements in posterior chamber (Thomsen and Østergaard 2019).…”

“…Distribution: Marine water of Hawaii, Thailand, Taiwan (Hara et al 1996;Thomsen and Østergaard 2019), Australia (Lee et al, 2003).…”

Heterotrophic flagellates and centrohelid heliozoans from marine waters of Curacao, the Netherlands Antilles

“…It is made available under a preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in The copyright holder for this this version posted August 10, 2020. ; https://doi.org/10.1101/2020.08.10.243865 doi: bioRxiv preprint 11 between the transverse ribs of anterior and posterior chambers (Leadbeater 1972). However, A. camarensis can be distinguished by shorter distance between anterior transverse costa and the lorica waist (less than length of one longitudinal costal strip), and presence of additional helical costal elements in posterior chamber (Thomsen and Østergaard 2019).…”

“…Here we describe a microscopical investigation of the species diversity of heterotrophic flagellates and centrohelid heliozoans in marine waters of coast of Curacao, which has not specifically been investigated previously. For the Caribbean Sea in general, only seven species of choanoflagellates were known (Thomsen and Østergaard 2019) until recent. We find the diversity of heterotrophic protists on Curacao to be rich and intriguing, including the presence of species potentially important for clarifying previously puzzling evolutionary and ecological questions.…”