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Thalassiosira species (Bacillariophyceae, Thalassiosirales) in the North Sea at Helgoland (German Bight) and Sylt (North Frisian Wadden Sea) – a first approach to assessing diversity
Thalassiosira species are an important component of phytoplankton populations in pelagic waters around the islands of Helgoland and Sylt in the German North Sea. This taxonomic study revealed theExpand
Cryothecomonas aestivalis sp. nov., a colourless nanoflagellate feeding on the marine centric diatomGuinardia delicatula (Cleve) Hasle
The vegetative life cycle, host specificity, morphology, and ultrastructure of a new phagotrophic nanoflagellate are described:Cryothecomonas aestivalis Drebes, Kühn & Schnepf sp. nov. During summerExpand
Development and ultrastructure of the marine, parasitic oomycete, Lagenisma coscinodisci (Lagenidiales): sexual reproduction
Fine structural details of antheridia and oogonia, of cytogamy, plasmogamy, and karyogamy, and finally of the development of the oospore are described. Sexually determined zoospores (most probablyExpand
On the life history of the marine plankton diatomStephanopyxis palmeriana
  • G. Drebes
  • Biology
  • Helgoländer wissenschaftliche…
  • 1 July 1966
KurzfassungIm Frühjahr 1964 wurde die zentrische PlanktondiatomeeStephanopyxis palmeriana (Grev.)Grunow — eine aus japanischen Gewässern stammende Warmwasserform und unsererS. turris sehr naheExpand
Development and ultrastructure of the marine, parasitic oomycete, Lagenisma coscinodisci Drebes (Lagenidiales)
Lagenisma coscinodisci is diplanetic and has two different cyst stages. The secondary cyst has a uniform cell wall of fibrillar material. It attaches to a Coscinodiscus frustule and germinates withExpand
Gyrodinium undulans Hulburt, a marine dinoflagellate feeding on the bloom-forming diatomOdontella aurita, and on copepod and rotifer eggs
The marine dinoflagellateGyrodinium undulans was discovered as a feeder on the planktonic diatomOdontella aurita. Every year, during winter and early spring, a certain percentage of cells of thisExpand
Life cycles, phylogeny and taxonomy ofDissodinium andPyrocystis (Dinophyta)
Life cycles of several species belonging to the marine generaDissodinium Klebs in Pascher andPyrocystis Murray ex Haeckel are described. The two known species ofDissodinium, D. pseudolunula Swift exExpand
Development and ultrastructure of the marine, parasitic oomycete, Lagenisma coscinodisci (Lagenidiales): encystment of primary zoospores
The primary zoospores of Lagenisma contain many peripheral "encystment vesicles." They disappear when the primary cyst wall is formed. The primary cyst wall consists of a 6-nm-thick, electron-denseExpand
Development and ultrastructure of the marine, parasitic Oomycete,Lagenisma coscinodisci Drebes (Lagenidiales): Formation of the primary zoospores and their release
SummaryZoosporogenesis inLagenisma begins after the final nuclear division by the development of “encystment vesicles” which presumably are derived from Golgi vesicles. The sporangial wall isExpand