Back
Dinopterygium cladoides
Dinopterygium cladoides Deflandre, 1935, p.231, pl.8, fig.6.
Taxonomic junior synonym: Toolongia (as Dinopterygium) medusoides, according to Yun Hyesu (1981, p.71); Oodnadattia tuberculata, according to Clarke and Verdier (1967, p.36) - however, Stover and Evitt (1978, p.205) retained Oodnadattia (as Dinopterygium) tuberculata. A full description of this species was given in Deflandre (1936b, p.181-182).
Holotype: Deflandre, 1935, pl.8, fig.6; Deflandre, 1936b, pl.8, figs.1-2.
Locus typicus: Paris Basin, France
Age: Senonian.
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Dinopterygium cladoides Deflandre, 1935, is characterized by the possession of a narrow equatorial cingulum, with two very large membranes, and by the development of a system of fine wing-like, crested membranes, which delineate the tabulation. It has a goniodomacean tabulation and a disintegration archeopyle (see MacRae, 1998). It is the end member of a plexus, whose other end member is Xiphophoridium alatum. Size: length 40 µm, width 50 µm. Total with horns 65 µm by 78 µm.
--------------------------------------------------
Original description: Deflandre, 1935, p. 231
(description of the genus Dinopterygium) The outline, as presented in the figure, recalls that of certain medieval helmets. Its furrow, ornamented with large punctations, is enclosed by two large aliform outgrowths. One of the poles of the theca carries a complicated system of fine membranes, folded in this fossil, rather analogous to those of many Ornithocercacae (Ornithocercus, Histioneis) and recalling also those of several Hystrichosphaeridae.
Supplemental description: Deflandre, 1936, p. 182
In frontal view, the outline of the theca is hexagonal and separated in two approximately equal parts by a straight transverse furrow, bordered on both sides by large membranous expansions, which run around the theca.
The transverse furrow appeared to be circular; the longitudinal furrow was not present, and thus the orientation of the theca in my figures is arbitrary.
The upper part has the shape of a truncate pyramid, and the sides are formed by plates. The ribs are lined with aliform crests, which, at their vertical angles, form a kind of membranous horns.
The lower part is rounded, bearing similar crests, as well as a large, flexible membrane, which appears to be supported by thin, straight or curved horns.
The brownish wall has large, ill-marked punctations, which are also found within the transverse furrow, where they run parallel. The height of the actual theca is 40 Ám, the width about 50 Ám. The total height, including the membranes, is 65 Ám, and the maximum width 78 Ám.
Morgenroth, 1966, p. 12 (also known as D. cladoides sensu Morgenroth 1966)
Remark: A few speimens of this species were found in the Lower Eocene of Fehmarn and Belgium. All present a polar view, so that only part of the dimensions could be determined.
Dimensions: capsule diameter 47-53 Ám, specimen diameter 73-78 Ám, width of girdle membranee 11-14 Ám (4 measurements). 4 specimens studied.
Taxonomic junior synonym: Toolongia (as Dinopterygium) medusoides, according to Yun Hyesu (1981, p.71); Oodnadattia tuberculata, according to Clarke and Verdier (1967, p.36) - however, Stover and Evitt (1978, p.205) retained Oodnadattia (as Dinopterygium) tuberculata. A full description of this species was given in Deflandre (1936b, p.181-182).
Holotype: Deflandre, 1935, pl.8, fig.6; Deflandre, 1936b, pl.8, figs.1-2.
Locus typicus: Paris Basin, France
Age: Senonian.
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Dinopterygium cladoides Deflandre, 1935, is characterized by the possession of a narrow equatorial cingulum, with two very large membranes, and by the development of a system of fine wing-like, crested membranes, which delineate the tabulation. It has a goniodomacean tabulation and a disintegration archeopyle (see MacRae, 1998). It is the end member of a plexus, whose other end member is Xiphophoridium alatum. Size: length 40 µm, width 50 µm. Total with horns 65 µm by 78 µm.
--------------------------------------------------
Original description: Deflandre, 1935, p. 231
(description of the genus Dinopterygium) The outline, as presented in the figure, recalls that of certain medieval helmets. Its furrow, ornamented with large punctations, is enclosed by two large aliform outgrowths. One of the poles of the theca carries a complicated system of fine membranes, folded in this fossil, rather analogous to those of many Ornithocercacae (Ornithocercus, Histioneis) and recalling also those of several Hystrichosphaeridae.
Supplemental description: Deflandre, 1936, p. 182
In frontal view, the outline of the theca is hexagonal and separated in two approximately equal parts by a straight transverse furrow, bordered on both sides by large membranous expansions, which run around the theca.
The transverse furrow appeared to be circular; the longitudinal furrow was not present, and thus the orientation of the theca in my figures is arbitrary.
The upper part has the shape of a truncate pyramid, and the sides are formed by plates. The ribs are lined with aliform crests, which, at their vertical angles, form a kind of membranous horns.
The lower part is rounded, bearing similar crests, as well as a large, flexible membrane, which appears to be supported by thin, straight or curved horns.
The brownish wall has large, ill-marked punctations, which are also found within the transverse furrow, where they run parallel. The height of the actual theca is 40 Ám, the width about 50 Ám. The total height, including the membranes, is 65 Ám, and the maximum width 78 Ám.
Morgenroth, 1966, p. 12 (also known as D. cladoides sensu Morgenroth 1966)
Remark: A few speimens of this species were found in the Lower Eocene of Fehmarn and Belgium. All present a polar view, so that only part of the dimensions could be determined.
Dimensions: capsule diameter 47-53 Ám, specimen diameter 73-78 Ám, width of girdle membranee 11-14 Ám (4 measurements). 4 specimens studied.