Abstract
A new coccolithophoridCricosphaera roscoffensis var.haptonemofera is described by means of electron microscopy and with the aid of laboratory culture. The living specimens, which were in the motile phase, were collected in Okinawa, a subtropical region in Japan, and a unialgal culture was established in the laboratory. The life history was observed, starting from the motile cells. The life history consists of two phases: the motile phase and the benthic filamentous phase. The former is unicellular and presumably a diploid sporophyte, whereas the latter is similar to an alga previously known as “Apistonema submarinum” described by Dangeard (1934), and probably a haploid gametophyte. The motile cells bear two acronematic flagella and one short haptonema. The scales attached on the surface of the motile cells are of two kinds: one is an organic thin scale, and the other is a cricolith, a kind of coccolith, the latter being structurally almost identical with that ofCricosphaera roscoffensis studied by Gayral and Fresnel (1976). Because this species has neither haptonema nor a benthic filamentous phase, we propose, at present, to treat this alga as a new taxon at the rank of infraspecies, naming itCricosphaera roscoffensis var.haptonemofera Inouye et Chihara.
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This study was supported by the Grants in Aid, No. 134058, for Cooperative Research, Ministry of Education, Japan.
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Inouye, I., Chihara, M. Life history and taxonomy ofCricosphaera roscoffensis var.haptonemofera, var. nov. (class prymnesiophyceae) from the pacific. Bot. Mag. Tokyo 92, 75–87 (1979). https://doi.org/10.1007/BF02488303
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DOI: https://doi.org/10.1007/BF02488303