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Scriniodinium attadalense
Sriniodinuim attadalense (Cookson and Eisenack, 1958) Eisenack, 1967, p.193
NOW Endoscrinium. Originally Gymnodinium (motile stage), subsequently Scriniodinium, thirdly (and now) Endoscrinium.
Holotype: Cookson and Eisenack, 1958, pl.1, fig.7; Jan du Chêne et al., 1986a, pl.112, figs.4–7; Riding and Fensome, 2003, text-fig.4B.
Locus typicus: South Perth Formation, W Australia
Stratum typicum: Aptian
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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.
Scriniodinium attadalense (Cookson and Eisenack, 1958) Eisenack, 1967. Diagnosis according to Cookson and Eisenack (1958, p.25), has a pericyst with a rather squarish outline, with almost straight to convex sides and is divided unequally by a shallow transverse girdle into a slightly shorter and broader epicyst and a longer and somewhat pointed hypocyst.The endocyst follows the outline of the pericyst but does not fill its cavity, a margin of about 11um being left around it. In the type the antapex of the endocyst seems to be open, as does the membrane of the pericyst directly opposite it. However, this feature has not been evident in the three other examples of G.attadalense in the present collection. The outer membrane and endocyst membrane are very faintly granular to smooth. Size: type pericyst 81 x 81 µm, endocyst 59 x 59 µm.
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Original description: Cookson and Eisenack, 1958, p. 25: Gymnodinium attadalense
The test has a rather squarish outline with almost straight to convex sides and is divided unequally by a shallow transverse girdle into a slightly shorter and broader epitheca and a longer and somewhat pointed hypotheca. The capsule follows the outline of the test but does not fill the its cavity, a margin of about 11 µm being left around it. In the type the antapex of the capsule seems to be open, as does the membrane of the test directly opposite to it. However, this feature has not been evident in the three other examples of g. attadalense in the present collection. The outer membrane and membrane of the capsule are very faintly granular to smooth. A large pylome is developed in the epitheca.
Dimensions: Type 81 x 81 µm, capsule 59 x 59 µm.
Affinities:
Cookson and Eisenack, 1958, p. 25: Gymnodinium attadalense
G. attadalense is of the same general type as the jurassic species G. crystallinum, G. luridum and G. parvimarginatum, but differs from all others in the shape of the test.
Poulsen 1996, p. 81
Scriniodinium cf. attadalense (Cookson & Eisenack 1958), Eisenack 1967, Pl. 18, Figs. 4-5
Remarks. This form appears to be intermediate between S. inritibilum and Scriniodinium attadalense (Cookson and Eisenack 1958) Eisenack 1967. It lacks the small apical horn which is normally seen on S. inritibilum, but it is only assigned questionably to S. attadalense which it resembles most closely.
Recorded occurrence. In the earliest Volgian (Sokolovi Zone) of Poland.
NOW Endoscrinium. Originally Gymnodinium (motile stage), subsequently Scriniodinium, thirdly (and now) Endoscrinium.
Holotype: Cookson and Eisenack, 1958, pl.1, fig.7; Jan du Chêne et al., 1986a, pl.112, figs.4–7; Riding and Fensome, 2003, text-fig.4B.
Locus typicus: South Perth Formation, W Australia
Stratum typicum: Aptian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Scriniodinium attadalense (Cookson and Eisenack, 1958) Eisenack, 1967. Diagnosis according to Cookson and Eisenack (1958, p.25), has a pericyst with a rather squarish outline, with almost straight to convex sides and is divided unequally by a shallow transverse girdle into a slightly shorter and broader epicyst and a longer and somewhat pointed hypocyst.The endocyst follows the outline of the pericyst but does not fill its cavity, a margin of about 11um being left around it. In the type the antapex of the endocyst seems to be open, as does the membrane of the pericyst directly opposite it. However, this feature has not been evident in the three other examples of G.attadalense in the present collection. The outer membrane and endocyst membrane are very faintly granular to smooth. Size: type pericyst 81 x 81 µm, endocyst 59 x 59 µm.
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Original description: Cookson and Eisenack, 1958, p. 25: Gymnodinium attadalense
The test has a rather squarish outline with almost straight to convex sides and is divided unequally by a shallow transverse girdle into a slightly shorter and broader epitheca and a longer and somewhat pointed hypotheca. The capsule follows the outline of the test but does not fill the its cavity, a margin of about 11 µm being left around it. In the type the antapex of the capsule seems to be open, as does the membrane of the test directly opposite to it. However, this feature has not been evident in the three other examples of g. attadalense in the present collection. The outer membrane and membrane of the capsule are very faintly granular to smooth. A large pylome is developed in the epitheca.
Dimensions: Type 81 x 81 µm, capsule 59 x 59 µm.
Affinities:
Cookson and Eisenack, 1958, p. 25: Gymnodinium attadalense
G. attadalense is of the same general type as the jurassic species G. crystallinum, G. luridum and G. parvimarginatum, but differs from all others in the shape of the test.
Poulsen 1996, p. 81
Scriniodinium cf. attadalense (Cookson & Eisenack 1958), Eisenack 1967, Pl. 18, Figs. 4-5
Remarks. This form appears to be intermediate between S. inritibilum and Scriniodinium attadalense (Cookson and Eisenack 1958) Eisenack 1967. It lacks the small apical horn which is normally seen on S. inritibilum, but it is only assigned questionably to S. attadalense which it resembles most closely.
Recorded occurrence. In the earliest Volgian (Sokolovi Zone) of Poland.