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Seitenpfad:
- Modern Dinocyst Key
- transparent cysts
- Paratabulation reflected by septa
- Septa intermediate height
- Impagidinium velorum
Impagidinium velorum
Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 407.
lateral view
Sample: DP30PC, 575 cm
Region: Gulf of Taranto (Eastern Mediterranean)
Age: Dark ages (+/- 440 AD)
Photographs: Karin Zonneveld
Sample: DP30PC, 575 cm
Region: Gulf of Taranto (Eastern Mediterranean)
Age: Dark ages (+/- 440 AD)
Photographs: Karin Zonneveld
cross section
lateral view 2
Field Characteristics
Impagidinium velorum Bujak 1984
Field characteristics:
Proximochorate cyst of ovoid shape, with a pale thin wall, with smooth to chagrinate surface. Sutural septa are membranous and high (similar to the central body diameter), with smooth distal margins. Tabulation is difficult to determine due to flattening of sutural crests against cyst body. The cingulum is marked by single high, membranous sutural septum. The sulcus is shallow and bordered by sutural septa. Archeopyle is precingular (type P).
Dimensions: Cyst body: 47 x 53 µm; height of septa: 19 to 25 µm.
Motile affinity: Probably a cyst of Gonyaulax spp.
Stratigraphic range: Middle-Late Eocene to Recent.
Comparison with other species:
The septa of this species are often so high that you can not see its inner body. You can easily miss it in a slide since it very thin and transparent. It is hard to observe the archeopyle. It can be distinguished from Impagidinium pallidum by the reflection of the cingulum by one septum only.
Field characteristics:
Proximochorate cyst of ovoid shape, with a pale thin wall, with smooth to chagrinate surface. Sutural septa are membranous and high (similar to the central body diameter), with smooth distal margins. Tabulation is difficult to determine due to flattening of sutural crests against cyst body. The cingulum is marked by single high, membranous sutural septum. The sulcus is shallow and bordered by sutural septa. Archeopyle is precingular (type P).
Dimensions: Cyst body: 47 x 53 µm; height of septa: 19 to 25 µm.
Motile affinity: Probably a cyst of Gonyaulax spp.
Stratigraphic range: Middle-Late Eocene to Recent.
Comparison with other species:
The septa of this species are often so high that you can not see its inner body. You can easily miss it in a slide since it very thin and transparent. It is hard to observe the archeopyle. It can be distinguished from Impagidinium pallidum by the reflection of the cingulum by one septum only.
Geographic Distribution
Geographic distribution based on :
Zonneveld et al., 2013. Atlas of modern dinoflagellate cyst distribution based on 2405 datapoints. Review of Palaeobotany and Palynology, v. 191, 1-197
Zonneveld et al., 2013. Atlas of modern dinoflagellate cyst distribution based on 2405 datapoints. Review of Palaeobotany and Palynology, v. 191, 1-197
Impagidinium velorum is characteristic for open oceanic, full marine, low productivity environments of subtropical to equatorial regions where well ventilated bottom waters prevail.
Distribution:
Impagidinium velorum is observed in sub-tropical to equatorial regions and one site in the Atlantic sector of the Southern Ocean at the sub-tropical front. The species is absent in coastal sites and highest abundances (up to 2%) are found in the central parts of the oceans and seas.
Environmental parameters:
SST: 12.0 - 29.1°C (winter - spring) except for one site in the Atlantic Sector of Southern Ocean where SST: 2.6 - 4.5°C (winter - autumn), SSS: 32.7 - 39.1 (winter - summer), [P]: 0.08 - 1.46 μmol/l, [N]: 0.04 - 20.1 μmol/l, chlorophyll-a: 0.06 - 0.68 ml/l, bottom water [O2]: from 2.9 - 5.9 ml/l.
The distribution of Impagidinium velorum is restricted to oligotrophic environments in regions with well ventilated bottom waters.
Comparison with other records:
Impagidinium velorum has not been recorded from regions not covered by this Atlas.
Impagidinium velorum is observed in sub-tropical to equatorial regions and one site in the Atlantic sector of the Southern Ocean at the sub-tropical front. The species is absent in coastal sites and highest abundances (up to 2%) are found in the central parts of the oceans and seas.
Environmental parameters:
SST: 12.0 - 29.1°C (winter - spring) except for one site in the Atlantic Sector of Southern Ocean where SST: 2.6 - 4.5°C (winter - autumn), SSS: 32.7 - 39.1 (winter - summer), [P]: 0.08 - 1.46 μmol/l, [N]: 0.04 - 20.1 μmol/l, chlorophyll-a: 0.06 - 0.68 ml/l, bottom water [O2]: from 2.9 - 5.9 ml/l.
The distribution of Impagidinium velorum is restricted to oligotrophic environments in regions with well ventilated bottom waters.
Comparison with other records:
Impagidinium velorum has not been recorded from regions not covered by this Atlas.