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Valvaeodinium lineatum
Valvaeodinium lineatum (Wille and Gocht, 1979) Below, 1987
Originally Comparodinium, subsequently (and now) Valvaeodinium.
Holotype: Wille and Gocht, 1979, figs.13a-b; fig.27, nos.9a-b
Locus typicus: Jebenhausen, Swabian Alb, S Germany
Stratum typicum: Early Toarcian
Translation Wille and Gocht, 1979: LPP
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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.
Valvaeodinium lineatum (Wille and Gocht, 1979) Below, 1987b, has an ellipsoidal to rounded-cylindrical body with very thin single-layered wall. Two wide zones, above and below the cingulum, are characterized by meridional rows of minute coni or spines or by low, scalariform combs (ridges). These zones occupy the precingular and postcingular spaces. The cingulum is smooth and not divided. The apical, anterior and posterior intercalary and antapical regions have ornamentation consisting of small cones or short spines, which frequently outline paraplate patterns through sutural and intratabular elements. The archeopyle corresponds to plates 3' + 1a.
The body of V. lineatum is relatively small. Size: length 22-30 µm.
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Original diagnosis: Wille and Gocht, 1979, p. 235
Body ellipsoidal to rounded-cylindrical, with very thin, single-layered wall. Two broad zones (before and behind the cingulum) are characterized by longitudinal rows of tiny cones or thorns or by ledge-like crests; they occupy the pre- and post-cingular area. The cingulum is smooth and unsegmented. The apical, anterior and posterior intercalary and antapical regions have an ornamentation consisting of small cones or short thorns, which often indicate the tabulation by means of sutural or intratabular elements. A flagellar scar may be present.
The archaeopyle corresponds to the middorsal apical plates 3" and 4".
Dimensions: holotype length 35 µm, width 21 µm.
Affinities: Wille and Gocht, 1979, p. 235, 237
The ornamentation differs clearly from the presumably related form C. stipulatum: the adcingular areas are set strictly with longitudinal lines or ledges, whereas isolated elements are restricted to the adpolar areas and which also there attain a higher degree of arrangement.
As opposed to C. scalatum, C. lineatum is overall smaller and more delicate. As far as the longitudinal elementsa are developed as ladders, they are essentially lower. Also the remaining ornamentation is much more delicate. The species scalatum and lineatum are morphologically closer in the Lias delta than in the Lias epsilon.
Because, by the sutural arrangement of its elements, C. lineatum often shows intercalary plate boundaries, it is similar to C. puncatatum. In C. scalatum, on the other hand, at best intratabular thorns can be recognized.
Originally Comparodinium, subsequently (and now) Valvaeodinium.
Holotype: Wille and Gocht, 1979, figs.13a-b; fig.27, nos.9a-b
Locus typicus: Jebenhausen, Swabian Alb, S Germany
Stratum typicum: Early Toarcian
Translation Wille and Gocht, 1979: LPP
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Valvaeodinium lineatum (Wille and Gocht, 1979) Below, 1987b, has an ellipsoidal to rounded-cylindrical body with very thin single-layered wall. Two wide zones, above and below the cingulum, are characterized by meridional rows of minute coni or spines or by low, scalariform combs (ridges). These zones occupy the precingular and postcingular spaces. The cingulum is smooth and not divided. The apical, anterior and posterior intercalary and antapical regions have ornamentation consisting of small cones or short spines, which frequently outline paraplate patterns through sutural and intratabular elements. The archeopyle corresponds to plates 3' + 1a.
The body of V. lineatum is relatively small. Size: length 22-30 µm.
--------------------------------------------------
Original diagnosis: Wille and Gocht, 1979, p. 235
Body ellipsoidal to rounded-cylindrical, with very thin, single-layered wall. Two broad zones (before and behind the cingulum) are characterized by longitudinal rows of tiny cones or thorns or by ledge-like crests; they occupy the pre- and post-cingular area. The cingulum is smooth and unsegmented. The apical, anterior and posterior intercalary and antapical regions have an ornamentation consisting of small cones or short thorns, which often indicate the tabulation by means of sutural or intratabular elements. A flagellar scar may be present.
The archaeopyle corresponds to the middorsal apical plates 3" and 4".
Dimensions: holotype length 35 µm, width 21 µm.
Affinities: Wille and Gocht, 1979, p. 235, 237
The ornamentation differs clearly from the presumably related form C. stipulatum: the adcingular areas are set strictly with longitudinal lines or ledges, whereas isolated elements are restricted to the adpolar areas and which also there attain a higher degree of arrangement.
As opposed to C. scalatum, C. lineatum is overall smaller and more delicate. As far as the longitudinal elementsa are developed as ladders, they are essentially lower. Also the remaining ornamentation is much more delicate. The species scalatum and lineatum are morphologically closer in the Lias delta than in the Lias epsilon.
Because, by the sutural arrangement of its elements, C. lineatum often shows intercalary plate boundaries, it is similar to C. puncatatum. In C. scalatum, on the other hand, at best intratabular thorns can be recognized.