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Dilabidinium areolatum
From Fensome et al., 2019:
Dilabidinium areolatum Morgenroth et al., 2008, p.127–128, pl.9, figs.3–9. Holotype: Morgenroth et al., 2008, pl.9, figs.3–4.
Age: Late Miocene.
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We here consider this a peridinioid cyst, and probalby belongs in Cryodinium. Future studies should emend this.
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Original description Morgenroth et al., 2008:
Derivation of name: Latin, areolaeus, areolate, in reference to the areolate surface of the cyst.
Holotype: Pl. 9, Figs 3, 4. Sample CP-25, single grain slide CP-25/28.
Paratypes: single grain slides CP-25/61, CP-25/62, CP-25/64, CP-25/67, sample CP-25
Type locality: Cipamingkis River, West Java (Text-fig. 2). Cisubuh Formation, Late Miocene, Age N 17.
Diagnosis: Ovoidal to subspherical cysts with a gonyaulacalean paraplate pattern, reflected by sutural lines, at which the wall of the cyst is thinner than on the paraplates. Reflected tabulation: ?3', ?la, 6 ", 6c, ?'", lp, 1"". The surface of the cysts is areolate. The cysts do not show a simple or combined archeopyle, but seem to break up completely along the sutures bounding the paraplates, where the cyst waII is thinnest.
Description: The few complete specimens recovered are ovoidal to subrounded. Some specimen show a well developed paratabulation, while others show only weak indications of a tabulation pattern and are therefore easily overlooked as dinoflagellate cysts. All specimens have a cyst surface, which is clearer areolated. Several specimens show different phases of a break-up along the sutures, lines where the cyst wall is thinner and which mark the paratabulation. The sutures are devoid of the areolation covering the surface of the paraplates. One specimen shows an almost complete break-up.
Comments: The species has been found in one sample only, where it occurs infrequently. This may be due to the break-up mechanism, which leaves only isolated paraplates in palynological residues and which may be easily overlooked.
Dimensions: Length of cyst 60 (70) 80 μm, holotype 80 μm, maximum width of cyst 55 (60) 62 μm, width of holotype 60 μm. 7 specimens measured.
Dilabidinium areolatum Morgenroth et al., 2008, p.127–128, pl.9, figs.3–9. Holotype: Morgenroth et al., 2008, pl.9, figs.3–4.
Age: Late Miocene.
---------------------------------------------------------------------------------------------------
We here consider this a peridinioid cyst, and probalby belongs in Cryodinium. Future studies should emend this.
---------------------------------------------------------------------------------------------------
Original description Morgenroth et al., 2008:
Derivation of name: Latin, areolaeus, areolate, in reference to the areolate surface of the cyst.
Holotype: Pl. 9, Figs 3, 4. Sample CP-25, single grain slide CP-25/28.
Paratypes: single grain slides CP-25/61, CP-25/62, CP-25/64, CP-25/67, sample CP-25
Type locality: Cipamingkis River, West Java (Text-fig. 2). Cisubuh Formation, Late Miocene, Age N 17.
Diagnosis: Ovoidal to subspherical cysts with a gonyaulacalean paraplate pattern, reflected by sutural lines, at which the wall of the cyst is thinner than on the paraplates. Reflected tabulation: ?3', ?la, 6 ", 6c, ?'", lp, 1"". The surface of the cysts is areolate. The cysts do not show a simple or combined archeopyle, but seem to break up completely along the sutures bounding the paraplates, where the cyst waII is thinnest.
Description: The few complete specimens recovered are ovoidal to subrounded. Some specimen show a well developed paratabulation, while others show only weak indications of a tabulation pattern and are therefore easily overlooked as dinoflagellate cysts. All specimens have a cyst surface, which is clearer areolated. Several specimens show different phases of a break-up along the sutures, lines where the cyst wall is thinner and which mark the paratabulation. The sutures are devoid of the areolation covering the surface of the paraplates. One specimen shows an almost complete break-up.
Comments: The species has been found in one sample only, where it occurs infrequently. This may be due to the break-up mechanism, which leaves only isolated paraplates in palynological residues and which may be easily overlooked.
Dimensions: Length of cyst 60 (70) 80 μm, holotype 80 μm, maximum width of cyst 55 (60) 62 μm, width of holotype 60 μm. 7 specimens measured.