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Impagidinium dispertitum
Impagidinium dispertitum (Cookson and Eisenack, 1965) Stover and Evitt, 1978
Originally Leptodinium, subsequently (and now) Impagidinium.
Holotype: Cookson and Eisenack, 1965, pl.12, fig.5-6; Jan du Chene et al., 1986, pl.149, fig.11-16
Paratype: Cookson and Eisenack, 1965; Jan du Chene et al., 1986
Locus typicus: Browns Creek Clays, SW Victoria, Australia
Stratum typicum: Late Eocene
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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.
Impagidinium dispertitum (Cookson and Eisenack, 1965a) Stover and Evitt, 1978. The sulcus consists of three large plates; occasionally the suture between the upper two is incomplete. Size: length 55-80 µm, width 48-86 µm.
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Original description: Cookson and Eisenack 1965a, p. 122-123: Leptodinium dispertitum
Description: Shell small, oval, without horn, tabulated, and divided equally by a relatively broad, helicoid girdle consisting of six plates. Plates smooth or faintly granular, bordered by transparent ledges. The longitudinal field on the ventral surface (representative of a longitudinal furrow), which extends from the apical plates to the antapical plate, is typically marked by three large plates; very occasionally the transverse wall between the two upper ones is incomplete. Archaeopyle formed by the removal of plate 3''. Tabulation: 3-4', 6'', 6g, 5''', 1p, 1''''.
Dimensions: holotype 62 µm long, 57 µm wide. Range 55-80 µm long, 48-86 µm wide.
Affinities:
Cookson and Eisenack, 1965. p. 123: Leptodinium dispertitum
L. dispertitum closely resembles L. maculatum Cookson and Eisenack, 1961 from Upper Eocene deposits in Rottnest Is., Western Australia. It is distinct from this species in that the surfaces of the plates are smooth or only faintly granular, not "distinctly notted" as in L. maculatum and the longitudinal field is usually divided, not continuous and furrow-like as in that species.
Originally Leptodinium, subsequently (and now) Impagidinium.
Holotype: Cookson and Eisenack, 1965, pl.12, fig.5-6; Jan du Chene et al., 1986, pl.149, fig.11-16
Paratype: Cookson and Eisenack, 1965; Jan du Chene et al., 1986
Locus typicus: Browns Creek Clays, SW Victoria, Australia
Stratum typicum: Late Eocene
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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.
Impagidinium dispertitum (Cookson and Eisenack, 1965a) Stover and Evitt, 1978. The sulcus consists of three large plates; occasionally the suture between the upper two is incomplete. Size: length 55-80 µm, width 48-86 µm.
--------------------------------------------------
Original description: Cookson and Eisenack 1965a, p. 122-123: Leptodinium dispertitum
Description: Shell small, oval, without horn, tabulated, and divided equally by a relatively broad, helicoid girdle consisting of six plates. Plates smooth or faintly granular, bordered by transparent ledges. The longitudinal field on the ventral surface (representative of a longitudinal furrow), which extends from the apical plates to the antapical plate, is typically marked by three large plates; very occasionally the transverse wall between the two upper ones is incomplete. Archaeopyle formed by the removal of plate 3''. Tabulation: 3-4', 6'', 6g, 5''', 1p, 1''''.
Dimensions: holotype 62 µm long, 57 µm wide. Range 55-80 µm long, 48-86 µm wide.
Affinities:
Cookson and Eisenack, 1965. p. 123: Leptodinium dispertitum
L. dispertitum closely resembles L. maculatum Cookson and Eisenack, 1961 from Upper Eocene deposits in Rottnest Is., Western Australia. It is distinct from this species in that the surfaces of the plates are smooth or only faintly granular, not "distinctly notted" as in L. maculatum and the longitudinal field is usually divided, not continuous and furrow-like as in that species.