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Imbatodinium antennatum
Imbatodinium antennatum Gitmez and Sarjeant, 1972
Now Gochteodinia. Originally Imbatodinium, subsequently Pareodinia, thirdly (and now) Gochteodinia.
Holotype: Gitmez and Sarjeant, 1972, pl.11, fig.2-3
Paratypes: Gitmez and Sarjeant, 1972
Locus typicus: Warlingham, Surrey, England
Stratum typicum: Middle Kimmeridgian
Original diagnosis: Gitmez and Sarjeant, 1972, p.232
A proximate cyst, elongate to ovoidal in shape, with a strong apical horn. On the distal end of the horn, there is a thread-like projection of variable length ending in a small knob. In some cases, a cingulum is weakly developed; but there is no indication of tabulation or sulcus. The surfacc of the cyst is granular. An intercalary archaeopyle is often developed.
Dimensions: Holotype: overall length 73 µm, breadth 35 µm, apical horn length without projection 9 µm, with projection 16 µm. Range of the observed specimens (16 in number): overall length 62-100 µm, breadth 28-50 µm, overall length of horn 12-30 µm, horn length without projection 7-16 µm, length of the projection 4-14 µm.
Original description: Gitmez and Sarjeant, 1972, p.232
The cyst is elongate, broadening in the posterior median region. The apical horn is well developed, bearing a thread-like process of variable length, generally between half and one-third of the overall horn length. This thread-like process ends in a small bulge, which appears as a knob. The cingulum is only weakly developed, but may be suggested by faint surface marking. The epitract is longer than the hypotract, comprising almost two-thirds of the overall length.
Affinities:
Gitmez and Sarjeant, 1972, p.232: This new species of Imbatodinium is distinguished from the previously described species in its general shape, presence of an intercalary archaeopyle and characteristic shape of the apical horn. In horn shape, it is similar to I. villosum, which was recordedfrom the upper Jurassic of Russia, but it differs from I. villosum in the absence of the sutural spines distributed all over the surface.
Now Gochteodinia. Originally Imbatodinium, subsequently Pareodinia, thirdly (and now) Gochteodinia.
Holotype: Gitmez and Sarjeant, 1972, pl.11, fig.2-3
Paratypes: Gitmez and Sarjeant, 1972
Locus typicus: Warlingham, Surrey, England
Stratum typicum: Middle Kimmeridgian
Original diagnosis: Gitmez and Sarjeant, 1972, p.232
A proximate cyst, elongate to ovoidal in shape, with a strong apical horn. On the distal end of the horn, there is a thread-like projection of variable length ending in a small knob. In some cases, a cingulum is weakly developed; but there is no indication of tabulation or sulcus. The surfacc of the cyst is granular. An intercalary archaeopyle is often developed.
Dimensions: Holotype: overall length 73 µm, breadth 35 µm, apical horn length without projection 9 µm, with projection 16 µm. Range of the observed specimens (16 in number): overall length 62-100 µm, breadth 28-50 µm, overall length of horn 12-30 µm, horn length without projection 7-16 µm, length of the projection 4-14 µm.
Original description: Gitmez and Sarjeant, 1972, p.232
The cyst is elongate, broadening in the posterior median region. The apical horn is well developed, bearing a thread-like process of variable length, generally between half and one-third of the overall horn length. This thread-like process ends in a small bulge, which appears as a knob. The cingulum is only weakly developed, but may be suggested by faint surface marking. The epitract is longer than the hypotract, comprising almost two-thirds of the overall length.
Affinities:
Gitmez and Sarjeant, 1972, p.232: This new species of Imbatodinium is distinguished from the previously described species in its general shape, presence of an intercalary archaeopyle and characteristic shape of the apical horn. In horn shape, it is similar to I. villosum, which was recordedfrom the upper Jurassic of Russia, but it differs from I. villosum in the absence of the sutural spines distributed all over the surface.