Syltodinium listii
Diagnosis
Diagnosis_Genus: Syltodinium Drebes 1988. Ectoparasitic dinoflagellate on eggs of planktonic crustaceans and rotifers. Dinospores gymnodinoid. Food uptake phagotrophically by a peduncle. After feeding, the trophont detaches from the host and transforms into a palmelloid multiplication stage, embedded in a gelatinous envelope. Dinospores are formed by repeated binary fission.
Diagnosis_Species: Syltodinium listii Drebes 1988. Ectoparasitic on eggs of marine copepods (Temora longicornis, Acartia sp., Pseudocalanus elongatus) and rotifers (Synchaete sp.). Dinospores colourless, 27-33 µm long, 22-27 µm wide. Epicone conical, hypocone hemispherical or conical. Girdle median, left-handed, sulcus extending from antapex to apex. Nucleus roundish oval lying in the epicone. Trophont oval, slightly constricted by the girdle, up to 80 µm in length. Tubiform peduncle with a wall, left inside the host after detachment of the parasite. Detached trophont initially motile, then by secretion of a gelatinous envelope developing into a palmelloid multiplication stage. By repeated binary fission up to 16 or 32 dinospores are formed.
Freshly released dinospores are capable of infecting eggs of copepods or rotifers within the same day. In the absence of hosts they remain motile for a few weeks and do not encyst. Two-week old dinospores can still infect freshly offered eggs.
Body_trophont_length: 80 µm
Body_spores_length: 27-33 µm
Body_spores_wide: 22-27 µm
Etymology
The generic name and the epithet refer to the type locality.
Type species
This is the type species of the genus.
Type illustration / Type locality / Type specimen
Type locality: German Bight near List/Sylt.
Ecology
Substrate: epizoic
Salinity: marine
Sociability_trophonts: solitary
Sociability_trophonts: sometime gregarious
Life cycle
Generation: <1 month
Reproduction_mode: asexual
Symbiont: horizontal
Feeding behaviour
Mode of locomotion
Reference(s)
Observation site(s)
HOSTS
Association with... | Region origin | Name of site | In reference... |
---|---|---|---|
Acartia sp. | Wadden Sea | near List/Sylt |
Syltodinium listii gen. et spec. nov., a marine ectoparasitic dinoflagellate on eggs of copepods and rotifers. Helgoländer Meeresuntersuchungen 42:583-591. (1988) |
Pseudocalanus elongatus | Wadden Sea | near List/Sylt |
Syltodinium listii gen. et spec. nov., a marine ectoparasitic dinoflagellate on eggs of copepods and rotifers. Helgoländer Meeresuntersuchungen 42:583-591. (1988) |
Temora longicornis | Wadden Sea | near List/Sylt |
Syltodinium listii gen. et spec. nov., a marine ectoparasitic dinoflagellate on eggs of copepods and rotifers. Helgoländer Meeresuntersuchungen 42:583-591. (1988) |
Synchaeta sp. | Wadden Sea | near List/Sylt |
Syltodinium listii gen. et spec. nov., a marine ectoparasitic dinoflagellate on eggs of copepods and rotifers. Helgoländer Meeresuntersuchungen 42:583-591. (1988) |