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Deflandrea dissoluta
Deflandrea dissoluta Vozzhennikova, 1967
Holotype: Vozzhennikova, 1967, pl.73, fig.1 (lost, according to Lentin and Vozzhennikova, 1990)
Lectotype: Lentin and Vozzhennikova, 1990, pl.6, figs.1-5, text-fig.24 (designated by Lentin and Vozzhennikova, 1990)
Locus typicus: Kaliningrad region, Russia
Stratum typicum: Eocene
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.144
Theca pentagonal. Epitheca larger than hypotheca, funnelshapet, with walls of equal thickness over the middle part of the epitheca but thinner laterally. The apical horn is long or short, conical and straight or slightly inclined. Hypotheca broadly trapeziform with concave lateral walls and a concave antapical margin. Antapical horns small, acutely pointed and broadly divergent. On the lateral walls of the theca where the epitheca and hypotheca come together there are blunt outgrowths with a slightly depressed transverse furrow. The later is shallow, annulate and its ends serve as the beginning for the longitudinal furrow which extends over the hypotheca to the antapex. Internal body oval, its lateral walls sometimes attaining the thin lateral walls of the middle portion of the epitheca. The internal body occupies the greater part of the theca and its surface is more coarsely sculptured than that of the theca of itself. Surface of theca smooth or finely granular. Pylome large, trapeziform.
Expanded description: Lentin and Vozzhennikova, 1990, p.52
Cyst shape peridinioid with a long, conical apical horn and a convex pericingular region; antapex with two, more or less equal, short, sharply conical, widely divergent antapical horns, with the left antapical horn sometimes more developed; endocyst oval in outline, dividing the cyst equally; bicavate or circumcavate. Periphragm smooth to minutely granulose with rare, small intratabular spines; endophragm coarsely granulose. Paratabulation indicated by archeopyle and paracingulum; peridinioid. The periarcheopyle is broad hexa (lati-deltaform), operculum free; the endoarcheopyle is also broad hexa or undeveloped. The paracingulum is outlined by large granules which form parallel ridges. Parasulcus indicated by a depression on the hypocyst.
Size: Holotype, length 154 µm, width 89 µm, width of paracingulum 5 µm; endocyst, length 59 µm, width 70 µm. Range, length 145 - 175 µm, width 86 - 99 µm, width of parac1ngulum 5 - 8 µm; endocyst, length 58 - 76 µm, width 70 - 78 µm.
Affinities:
Lentin and Vozzhennikova, 1990, p.52: Deflandrea dissoluta superficially resembles Cerodinium speciosum (Alberti) Lentin and Williams, however that species has a standard hexa (isodeltaform) archeopyle, is striate and is smaller (size range, 110 - 130 µm) than the smallest specimens of D. dissoluta (size range, 145-175 µm).
Holotype: Vozzhennikova, 1967, pl.73, fig.1 (lost, according to Lentin and Vozzhennikova, 1990)
Lectotype: Lentin and Vozzhennikova, 1990, pl.6, figs.1-5, text-fig.24 (designated by Lentin and Vozzhennikova, 1990)
Locus typicus: Kaliningrad region, Russia
Stratum typicum: Eocene
Translation Vozzhennikova, 1967: Lentin and Vozzhennikova, 1990
Original description: Vozzhennikova, 1967, p.144
Theca pentagonal. Epitheca larger than hypotheca, funnelshapet, with walls of equal thickness over the middle part of the epitheca but thinner laterally. The apical horn is long or short, conical and straight or slightly inclined. Hypotheca broadly trapeziform with concave lateral walls and a concave antapical margin. Antapical horns small, acutely pointed and broadly divergent. On the lateral walls of the theca where the epitheca and hypotheca come together there are blunt outgrowths with a slightly depressed transverse furrow. The later is shallow, annulate and its ends serve as the beginning for the longitudinal furrow which extends over the hypotheca to the antapex. Internal body oval, its lateral walls sometimes attaining the thin lateral walls of the middle portion of the epitheca. The internal body occupies the greater part of the theca and its surface is more coarsely sculptured than that of the theca of itself. Surface of theca smooth or finely granular. Pylome large, trapeziform.
Expanded description: Lentin and Vozzhennikova, 1990, p.52
Cyst shape peridinioid with a long, conical apical horn and a convex pericingular region; antapex with two, more or less equal, short, sharply conical, widely divergent antapical horns, with the left antapical horn sometimes more developed; endocyst oval in outline, dividing the cyst equally; bicavate or circumcavate. Periphragm smooth to minutely granulose with rare, small intratabular spines; endophragm coarsely granulose. Paratabulation indicated by archeopyle and paracingulum; peridinioid. The periarcheopyle is broad hexa (lati-deltaform), operculum free; the endoarcheopyle is also broad hexa or undeveloped. The paracingulum is outlined by large granules which form parallel ridges. Parasulcus indicated by a depression on the hypocyst.
Size: Holotype, length 154 µm, width 89 µm, width of paracingulum 5 µm; endocyst, length 59 µm, width 70 µm. Range, length 145 - 175 µm, width 86 - 99 µm, width of parac1ngulum 5 - 8 µm; endocyst, length 58 - 76 µm, width 70 - 78 µm.
Affinities:
Lentin and Vozzhennikova, 1990, p.52: Deflandrea dissoluta superficially resembles Cerodinium speciosum (Alberti) Lentin and Williams, however that species has a standard hexa (isodeltaform) archeopyle, is striate and is smaller (size range, 110 - 130 µm) than the smallest specimens of D. dissoluta (size range, 145-175 µm).