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Peridinium comatum
Peridinium comatum Morgenroth, 1966
Now Phthanoperidinium. Originally Peridinium, subsequently (and now) Phthanoperidinium.
Tax. sr. synonym of Phthanoperidinium tritonium Eaton, 1976, according to Bujak in Bujak et al., 1980.
Tax. sr. synonym of Phthanoperidinium coreoides (Benedek, 1972) Lentin and Williams, 1976, according to Stover and Evitt, 1978; however, Benedek and Sarjeant, 1981 retained Phthanoperidinium coreoides as a separate species.
Holotype: Morgenroth, 1966, pl.1, fig.1
Age: Early Oligocene
Original description Morgenroth, 1966 [translated PKB 2025]
Peridinium comatum
Plate. 1, Fig. 1, 2.
Derivatio nominis: comatus lat. = long furrowed.
Holotype: The one in slide H 18 preserved specimen shown on plate 1, Fig. 1. Paratypoids: H2, H10, H14, H16, H18.
Locus typicus: Depold'sche Ziegelei (South of Helmstedt)
Stratum typicum: Lower Oligocene
Diagnosis: A small species of the genus Peridinium with the tabulation scheme 4', 7'', 5''', 2''''. Numerous long, thread-like appendages rise from the table boundaries, which can split distally into several fine side branches.
Description: The tables of the small ellipsoidal theca are weakly granulated. The sutures are relatively weak. They are covered with numerous long, thread-like appendages that can split distally into several fine side branches (oil immersion!). The epithet and the mortgage are approximately the same size. A very small apical horn, which is covered with appendages, rises above the epithet. The relatively wide, slightly depressed belt furrow runs in a slightly left-handed spiral. Their two ends are separated from each other by about 1 furrow width. The longitudinal furrow runs from the 1st apical plate to the antapex. Two tiny conical antapical horns rise on the two antapical plates, one of which is only hinted at - the archeopyle is formed by splitting off plate 2a.
Dimensions:
Cyst length: 39µ (33µ–47µ)
Cyst width: 30µ (25µ–33µ)
Process length: 14–20µ, maximum 28µ (30 measured)
Number of specimens measured: 36
Comparison: To date, no species of the genus Peridinium is known that has processes on the plate boundaries.
Now Phthanoperidinium. Originally Peridinium, subsequently (and now) Phthanoperidinium.
Tax. sr. synonym of Phthanoperidinium tritonium Eaton, 1976, according to Bujak in Bujak et al., 1980.
Tax. sr. synonym of Phthanoperidinium coreoides (Benedek, 1972) Lentin and Williams, 1976, according to Stover and Evitt, 1978; however, Benedek and Sarjeant, 1981 retained Phthanoperidinium coreoides as a separate species.
Holotype: Morgenroth, 1966, pl.1, fig.1
Age: Early Oligocene
Original description Morgenroth, 1966 [translated PKB 2025]
Peridinium comatum
Plate. 1, Fig. 1, 2.
Derivatio nominis: comatus lat. = long furrowed.
Holotype: The one in slide H 18 preserved specimen shown on plate 1, Fig. 1. Paratypoids: H2, H10, H14, H16, H18.
Locus typicus: Depold'sche Ziegelei (South of Helmstedt)
Stratum typicum: Lower Oligocene
Diagnosis: A small species of the genus Peridinium with the tabulation scheme 4', 7'', 5''', 2''''. Numerous long, thread-like appendages rise from the table boundaries, which can split distally into several fine side branches.
Description: The tables of the small ellipsoidal theca are weakly granulated. The sutures are relatively weak. They are covered with numerous long, thread-like appendages that can split distally into several fine side branches (oil immersion!). The epithet and the mortgage are approximately the same size. A very small apical horn, which is covered with appendages, rises above the epithet. The relatively wide, slightly depressed belt furrow runs in a slightly left-handed spiral. Their two ends are separated from each other by about 1 furrow width. The longitudinal furrow runs from the 1st apical plate to the antapex. Two tiny conical antapical horns rise on the two antapical plates, one of which is only hinted at - the archeopyle is formed by splitting off plate 2a.
Dimensions:
Cyst length: 39µ (33µ–47µ)
Cyst width: 30µ (25µ–33µ)
Process length: 14–20µ, maximum 28µ (30 measured)
Number of specimens measured: 36
Comparison: To date, no species of the genus Peridinium is known that has processes on the plate boundaries.