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Apectodinium homomorphum
Apectodinium homomorphum, (Deflandre and Cookson, 1955), Lentin and Williams, 1977
Originally Wetzeliella, subsequently Wetzeliella subgen. Apectodinium, thirdly (and now) Apectodinium.
Holotype: Deflandre and Cookon 1955, pl.5, fig.7
Locus typicus: Victoria, Australia
Stratum typicum: Early Eocene
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Original description as Wetzeliella homomorpha: [Deflandre and Cookson, 1955, p. 254]:
Description:
Theca compressed, outline polygonal or more or less rounded, furnished with short, simple or bifurcate processes sometimes associated in small groups, generally more numerous at the edge of the theca. Membrane with a smooth surface.
Dimensions:
Diameter of shell (not counting appendages) 44-60 µm, processes 5-15 µm long.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Apectodinium homomorphum (Deflandre and Cookson, 1955) Lentin and Williams, 1977b, emend. Harland, 1979c. According to Harland (1979c, p. 64), this species has an ovoidal to rounded-pentagonal cyst with closely adpressed wall layers, except at the apex where a small pericoel may be developed. Processes variable in length, sutural and intratabular, hollow, cylindrical to tapering with evexate or bifid tips, sometimes branched and aculeate. Tabulation indiscernible. Cingulum usually planar but may be laevorotatory, displaced up to one half of its width. Sulcus appears as a shallow depression widening antapically. Archeopyle type [I/I], ?reduced.
Size: Pericyst 44-60 µm, processes 5-15 µm.
Originally Wetzeliella, subsequently Wetzeliella subgen. Apectodinium, thirdly (and now) Apectodinium.
Holotype: Deflandre and Cookon 1955, pl.5, fig.7
Locus typicus: Victoria, Australia
Stratum typicum: Early Eocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Wetzeliella homomorpha: [Deflandre and Cookson, 1955, p. 254]:
Description:
Theca compressed, outline polygonal or more or less rounded, furnished with short, simple or bifurcate processes sometimes associated in small groups, generally more numerous at the edge of the theca. Membrane with a smooth surface.
Dimensions:
Diameter of shell (not counting appendages) 44-60 µm, processes 5-15 µm long.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Apectodinium homomorphum (Deflandre and Cookson, 1955) Lentin and Williams, 1977b, emend. Harland, 1979c. According to Harland (1979c, p. 64), this species has an ovoidal to rounded-pentagonal cyst with closely adpressed wall layers, except at the apex where a small pericoel may be developed. Processes variable in length, sutural and intratabular, hollow, cylindrical to tapering with evexate or bifid tips, sometimes branched and aculeate. Tabulation indiscernible. Cingulum usually planar but may be laevorotatory, displaced up to one half of its width. Sulcus appears as a shallow depression widening antapically. Archeopyle type [I/I], ?reduced.
Size: Pericyst 44-60 µm, processes 5-15 µm.