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Corrudinium incompositum
Corrudinium incompositum (Drugg, 1970b, p.810-811, figs.1E-O,2A) Stover and Evitt, 1978, p.149.
Originally Gonyaulacysta, subsequently Leptodinium, thirdly (and now) Corrudinium.
Holotype: Drugg, 1970b, figs.1I-J; Eisenack and Kjellström, 1975a, page labelled "nach S.306d"; Jan du Chêne et al., 1986a, pl.17, figs.1-?2; Fensome et al., 1995, figs.1-2 - p.1561.
Isotype: Drugg, 1970
Paratypes: Drugg, 1970; Jan du Chene et al., 1986
Locus typicus: Hinds County, Mississippi, U.S.A.
Stratum typicum: Oligocene
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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.
Corrudinium incompositum (Drugg, 1970b) Stover and Evitt, 1978, has a tabulation of 3', 6", 6c, 1ppl, 1p, 1"”, with the sulcus containing several small plates. The sutures are in the form of low ridges. The ornamentation consists of random low ridges, which are often branched and occasional small tubercles. The ridges usually originate from the sutures and project into the intratabular areas. Size: 25-36 µm.
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Original description: Drugg 1970, p. 810-811: Gonyaulacysta incomposita
Diagnosis: Tract small, ovoidal to spherical in shape. The tabulation (see Fig.1 E-H) is 3', 6'', 6-7c, 6''', 1p.pl., 1p., 1''''. The archeopyle is formed by the loss of plate 3''. The sulcus contains several small platelets. The cingulum is helicoidal and consists of six to seven cingular plates, some examples seemingly having six plates and some having seven plates. The sutures are in the form of low ridges. The wall is thin and often bears scattered grana. The ornamentation consists of random low ridges, which are often branched, and occasional small tubercules. The ridges usually originate from the sutures and project into the intratabular areas (see Fig.2A). These ornamental ridges mimic sutural ridges and make the determination of the tabulation somewhat difficult. The tract diameter ranges from 25 to 36 µm, most specimens being about 30 µm.
Originally Gonyaulacysta, subsequently Leptodinium, thirdly (and now) Corrudinium.
Holotype: Drugg, 1970b, figs.1I-J; Eisenack and Kjellström, 1975a, page labelled "nach S.306d"; Jan du Chêne et al., 1986a, pl.17, figs.1-?2; Fensome et al., 1995, figs.1-2 - p.1561.
Isotype: Drugg, 1970
Paratypes: Drugg, 1970; Jan du Chene et al., 1986
Locus typicus: Hinds County, Mississippi, U.S.A.
Stratum typicum: Oligocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Corrudinium incompositum (Drugg, 1970b) Stover and Evitt, 1978, has a tabulation of 3', 6", 6c, 1ppl, 1p, 1"”, with the sulcus containing several small plates. The sutures are in the form of low ridges. The ornamentation consists of random low ridges, which are often branched and occasional small tubercles. The ridges usually originate from the sutures and project into the intratabular areas. Size: 25-36 µm.
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Original description: Drugg 1970, p. 810-811: Gonyaulacysta incomposita
Diagnosis: Tract small, ovoidal to spherical in shape. The tabulation (see Fig.1 E-H) is 3', 6'', 6-7c, 6''', 1p.pl., 1p., 1''''. The archeopyle is formed by the loss of plate 3''. The sulcus contains several small platelets. The cingulum is helicoidal and consists of six to seven cingular plates, some examples seemingly having six plates and some having seven plates. The sutures are in the form of low ridges. The wall is thin and often bears scattered grana. The ornamentation consists of random low ridges, which are often branched, and occasional small tubercules. The ridges usually originate from the sutures and project into the intratabular areas (see Fig.2A). These ornamental ridges mimic sutural ridges and make the determination of the tabulation somewhat difficult. The tract diameter ranges from 25 to 36 µm, most specimens being about 30 µm.