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Heteraulacacysta porosa
Hetaraulacacysta porosa Bujak in Bujak et al., 1980
Holotype: Bujak in Bujak et al., 1980, pl.15, fig.10
Paratypes: Bujak in Bujak et al., 1980
Locus typicus: Middle Barton Beds, Whitecliff Bay, Isle of Wight, S England
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.
Heteraulacacysta porosa Bujak in Bujak et al., 1980, is perforate all over the periphragm including the crests. The perforations are uniform over the central body, but are arranged in concentric rings on the distally entire paracingular crests. Size: overall diameter in polar view 66 x 75 to 100 x 110 µm, central body diameter in polar view 50 x 52 to 70 x 80 µm. Maximum height of crests 15-23 µm.
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Original description: Bujak in Bujak et al., 1980, p. 62
Diagnosis: Cyst discoidal with polar compression, approximately circular in polar view. Periphragm forming parasutural crests wich delimit a paratabuation of 1pr, 1'*, 3', 6'', xc, 5?-6''', 1p, 1'''', p.s. The first apical homologue (1'*) does not touch the preapical. It may contact 2', 4' and 1'' or only 4' and 1''. The first postcingular paraplate may be absent. Paracingulum defined by two broad membranous crests. The periphragm, including the paracingular crests, is perforate over its entire surface. The perforations are uniform over the central body, but are arranged in concentric rings on the distally entire, paracingular crests. Radiating striae occur near the junction of the central body and paracingular crests. The archaeopyle is hemicystal.
Dimensions: Over-all diameter in polar view = 66x75 µm to 100x110 µm. Central body diameter in polar view = 50x52 to 70x80 µm. Maximum height of paracingular crests = 15-23 µm (18 specimens measured).
Affinities:
Bujak in Bujak et al., 1980, p. 62
Heteraulacacysta porosa is distinguished from all other described species of Heteraulacacysta by its perforate periphragm.
Holotype: Bujak in Bujak et al., 1980, pl.15, fig.10
Paratypes: Bujak in Bujak et al., 1980
Locus typicus: Middle Barton Beds, Whitecliff Bay, Isle of Wight, S England
Stratum typicum: Late Eocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Heteraulacacysta porosa Bujak in Bujak et al., 1980, is perforate all over the periphragm including the crests. The perforations are uniform over the central body, but are arranged in concentric rings on the distally entire paracingular crests. Size: overall diameter in polar view 66 x 75 to 100 x 110 µm, central body diameter in polar view 50 x 52 to 70 x 80 µm. Maximum height of crests 15-23 µm.
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Original description: Bujak in Bujak et al., 1980, p. 62
Diagnosis: Cyst discoidal with polar compression, approximately circular in polar view. Periphragm forming parasutural crests wich delimit a paratabuation of 1pr, 1'*, 3', 6'', xc, 5?-6''', 1p, 1'''', p.s. The first apical homologue (1'*) does not touch the preapical. It may contact 2', 4' and 1'' or only 4' and 1''. The first postcingular paraplate may be absent. Paracingulum defined by two broad membranous crests. The periphragm, including the paracingular crests, is perforate over its entire surface. The perforations are uniform over the central body, but are arranged in concentric rings on the distally entire, paracingular crests. Radiating striae occur near the junction of the central body and paracingular crests. The archaeopyle is hemicystal.
Dimensions: Over-all diameter in polar view = 66x75 µm to 100x110 µm. Central body diameter in polar view = 50x52 to 70x80 µm. Maximum height of paracingular crests = 15-23 µm (18 specimens measured).
Affinities:
Bujak in Bujak et al., 1980, p. 62
Heteraulacacysta porosa is distinguished from all other described species of Heteraulacacysta by its perforate periphragm.