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Distatodinium cavatum
Distatodinium cavatum Zevenboom and Santarelli in Zevenboom, 1995, p.158-159, pl.8, figs.4-9.
Name not validly published: considered a manuscript name by authors.
Holotype: Zevenboom, 1995, pl.8, figs.4-6.
Age: latest Oligocene-Early Miocene.
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Distatodinium cavatum Zevenboom and Santarelli in Zevenboom, 1995, is an epi- to circumcavate species with distally expanded processes. Periphragm smooth. No processes on cingulum or sulcus. Processes short, tubular, hollow. Size: pericyst length 55-66 µm, width 25-40 µm, endocyst length 48-60 µm, width 20-25 µm.
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Original description (Zevenboom, 1995):
Distatodinium cavatum Zevenboom and Santarelli sp.nov. (manuscript name) (Plate VIII, 4-9)
1975 Tanyosphaeridium sp. A Williams and Brideaux, plate 24, figs. 1-2
1976 Tanyosphaeridium sp. cf. A Williams and Brideaux, 1975 Manum, plate 4, fig. 2
Manuscript holotype: Sample H 386/387, Sg. 82 C, Plate VIII, 4-6
Manuscript paratype: Sample H 270.271, Sg. 100 E, plate VIII, 7-9
Etymology: in reference to the epi- to circumcavate nature of the species
Type locality: Heumensoord. The Netherlands
Type stratum: Veldhoven Formation
Diagnosis: An epi- to circumcavate species of Distatodinium with distally expanded processes. The endo- and periphragm are thin and smooth. The process arrangement is intratabular. The paracingular and parasulcal plates are not reflected by processes.
Dimensions: Central body length of pericyst: 55 (62) 66 µm; endocyst: 48 (54) 60 µm. Width of pericyst: 25 (33) 40 µm; Endocyst: 20 (23) 25 µm. Process length: 20 (22) 25 µm. N = 15
Description: An epi- to circumcavate species of Distatodinium characterized by its clearly developed epi- to circumcavate epi- or/and hypocoel. The process arrangement is intratabular. The paracingular and parasulcul plates are not reflected by processes. A gonyaulacacean paratabulation of 3-4’, 6’’, 0c, 5-6’’’,0-1p, 1’’’’-3’’’’ may be discerned. The paratabulation sees to vary slightly from species to species. Both the periphragm and endophragm are smooth and thin; both endocyst and pericyst are elongate. The latter is sometimes considerably smaller than the endocyst, especially in the epicavatae ones. The processes are short, tubular and hollow. The apical archeopyle is formed by the loss of all apical plates, (tA)
Discussion: Distatodinium cavatum is the only epi- to circumcavate species of Distatodinium in its emended concept.
Occurrence: The Grand Banks (Williams and Brideaux, 1975), and the Norwegian Sea (Manum, 1976).
Total stratigraphic range: Uppermost Oligocene through Lower Miocene (this study), see Fig. 5
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Name not validly published: considered a manuscript name by authors.
Holotype: Zevenboom, 1995, pl.8, figs.4-6.
Age: latest Oligocene-Early Miocene.
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Distatodinium cavatum Zevenboom and Santarelli in Zevenboom, 1995, is an epi- to circumcavate species with distally expanded processes. Periphragm smooth. No processes on cingulum or sulcus. Processes short, tubular, hollow. Size: pericyst length 55-66 µm, width 25-40 µm, endocyst length 48-60 µm, width 20-25 µm.
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Original description (Zevenboom, 1995):
Distatodinium cavatum Zevenboom and Santarelli sp.nov. (manuscript name) (Plate VIII, 4-9)
1975 Tanyosphaeridium sp. A Williams and Brideaux, plate 24, figs. 1-2
1976 Tanyosphaeridium sp. cf. A Williams and Brideaux, 1975 Manum, plate 4, fig. 2
Manuscript holotype: Sample H 386/387, Sg. 82 C, Plate VIII, 4-6
Manuscript paratype: Sample H 270.271, Sg. 100 E, plate VIII, 7-9
Etymology: in reference to the epi- to circumcavate nature of the species
Type locality: Heumensoord. The Netherlands
Type stratum: Veldhoven Formation
Diagnosis: An epi- to circumcavate species of Distatodinium with distally expanded processes. The endo- and periphragm are thin and smooth. The process arrangement is intratabular. The paracingular and parasulcal plates are not reflected by processes.
Dimensions: Central body length of pericyst: 55 (62) 66 µm; endocyst: 48 (54) 60 µm. Width of pericyst: 25 (33) 40 µm; Endocyst: 20 (23) 25 µm. Process length: 20 (22) 25 µm. N = 15
Description: An epi- to circumcavate species of Distatodinium characterized by its clearly developed epi- to circumcavate epi- or/and hypocoel. The process arrangement is intratabular. The paracingular and parasulcul plates are not reflected by processes. A gonyaulacacean paratabulation of 3-4’, 6’’, 0c, 5-6’’’,0-1p, 1’’’’-3’’’’ may be discerned. The paratabulation sees to vary slightly from species to species. Both the periphragm and endophragm are smooth and thin; both endocyst and pericyst are elongate. The latter is sometimes considerably smaller than the endocyst, especially in the epicavatae ones. The processes are short, tubular and hollow. The apical archeopyle is formed by the loss of all apical plates, (tA)
Discussion: Distatodinium cavatum is the only epi- to circumcavate species of Distatodinium in its emended concept.
Occurrence: The Grand Banks (Williams and Brideaux, 1975), and the Norwegian Sea (Manum, 1976).
Total stratigraphic range: Uppermost Oligocene through Lower Miocene (this study), see Fig. 5
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