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Phthanoperidinium comatum
Phthanoperidinium comatum (Morgenroth, 1966) Eisenack and Kjellstr÷m, 1971
Originally Peridinium, subsequently (and now) Phthanoperidinium.
Taxonomic junior synonyms: Phthanoperidinium tritonium, according to Bujak in Bujak et al. (1980, p.72) — however, Fensome et al. (2009, p.54–55) considered Phthanoperidinium tritonium to be a taxonomic junior synonym of Phthanoperidinium coreoides; Hystrichogonyaulax (now Phthanoperidinium) coreoides, according to Stover and Evitt (1978, p.118) — however, Benedek and Sarjeant (1981, p.328–330) retained Phthanoperidinium coreoides. Eaton (1976, p.294) also proposed this combination.
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.
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP
Phthanoperidinium comatum (Morgenroth, 1966b) Eisenack and Kjellström, 1972. Diagnosis (in part) from Morgenroth (1966b, p.1). A small species of Peridinium with the tabulation 4', 3a, 7", 5"’, 2"”. From the plate boundaries arise numerous long, filamentous processes which distally can split into small spines. Size: length 33-47 µm, width 25-33 µm, spines 14-28. Phthanoperidinium coreoides size: capsule length 36-38 µm, width 26 µm, process length 6-8 µm. Phthanoperidinium tritonium, holotype cyst body 44 x 37 µm, length of spines up to 7 µm, observed range, 30x 26 to 56 x 46, length of spines up to 13 µm.
Originally Peridinium, subsequently (and now) Phthanoperidinium.
Taxonomic junior synonyms: Phthanoperidinium tritonium, according to Bujak in Bujak et al. (1980, p.72) — however, Fensome et al. (2009, p.54–55) considered Phthanoperidinium tritonium to be a taxonomic junior synonym of Phthanoperidinium coreoides; Hystrichogonyaulax (now Phthanoperidinium) coreoides, according to Stover and Evitt (1978, p.118) — however, Benedek and Sarjeant (1981, p.328–330) retained Phthanoperidinium coreoides. Eaton (1976, p.294) also proposed this combination.
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.
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP
Phthanoperidinium comatum (Morgenroth, 1966b) Eisenack and Kjellström, 1972. Diagnosis (in part) from Morgenroth (1966b, p.1). A small species of Peridinium with the tabulation 4', 3a, 7", 5"’, 2"”. From the plate boundaries arise numerous long, filamentous processes which distally can split into small spines. Size: length 33-47 µm, width 25-33 µm, spines 14-28. Phthanoperidinium coreoides size: capsule length 36-38 µm, width 26 µm, process length 6-8 µm. Phthanoperidinium tritonium, holotype cyst body 44 x 37 µm, length of spines up to 7 µm, observed range, 30x 26 to 56 x 46, length of spines up to 13 µm.