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Laciniadinium tenuistriatum
Laciniadinium tenuistriatum (Eisenack and Cookson, 1960) Morgan, 1977
Originally Diconodinium, subsequently (and now) Laciniadinium.
Holotype: Eisenack and Cookson, 1960, pl.1, figs.14-15; Morgan, 1977, pl.2, figs.3a-b
Locus typicus: N of Gingin, W Australia
Stratum typicum: Late Albian-Cenomanian
Original description: Eisenack and Cookson, 1960, p. 4: Diconodinium tenuistriatum
Shell ovoidal to nearly sphaerical, girdle usually faintly marked, epitheca longer than hypotheca, apical process very short, concave, antapical spine only slightly represented. Shell-membrane thin, ornamented with close rows of regulary and closely arranged small granules which converge towards both apex and antapex. Striation on the ventral surface outwardly directed towards the ends of the girdle, leaving a wide unpatterned area which corresponds in position to a longitudinal furrow.
Dimensions: Type 62 Ám long, 58 Ám broad. Range 48-67 Ám long, 46-60 Ám broad.
Description: Morgan, 1977, p. 136-137
Apparent autocyst, ambitus subcircular drawn into a 2-3 Ám high and 6-8 Ám broad apical bulge and a single, slightly eccentrically located, 2-3 Ám high antapical bulge. Epicyst and hypocyst of approximately equal size. Autophragm mostly thin, except in apical bulge, where slight thickening to 1.0 Ám may occur. Surface bears dense, 1.0 Ám granules strongly aligned into semicontinuous nontabular rows starting at the apical horn, crossing the paracingulum and terminating at the single antapical horn. Planar paracingulum delineated by two slightly raised parasutural ridges; parasulcus not defined, individual paraplates not discernible. Archeoplye unknown.
Dimensions: 48-67 Ám long and 46-60 Ám broad.
Affinities:
Morgan, 1977, p. 137: The subcircular ambitus and dense aligned granules are characteristic of. L. tenuistriatum. For comparisons to other species, see treatnem of. L. inflatum.
Originally Diconodinium, subsequently (and now) Laciniadinium.
Holotype: Eisenack and Cookson, 1960, pl.1, figs.14-15; Morgan, 1977, pl.2, figs.3a-b
Locus typicus: N of Gingin, W Australia
Stratum typicum: Late Albian-Cenomanian
Original description: Eisenack and Cookson, 1960, p. 4: Diconodinium tenuistriatum
Shell ovoidal to nearly sphaerical, girdle usually faintly marked, epitheca longer than hypotheca, apical process very short, concave, antapical spine only slightly represented. Shell-membrane thin, ornamented with close rows of regulary and closely arranged small granules which converge towards both apex and antapex. Striation on the ventral surface outwardly directed towards the ends of the girdle, leaving a wide unpatterned area which corresponds in position to a longitudinal furrow.
Dimensions: Type 62 Ám long, 58 Ám broad. Range 48-67 Ám long, 46-60 Ám broad.
Description: Morgan, 1977, p. 136-137
Apparent autocyst, ambitus subcircular drawn into a 2-3 Ám high and 6-8 Ám broad apical bulge and a single, slightly eccentrically located, 2-3 Ám high antapical bulge. Epicyst and hypocyst of approximately equal size. Autophragm mostly thin, except in apical bulge, where slight thickening to 1.0 Ám may occur. Surface bears dense, 1.0 Ám granules strongly aligned into semicontinuous nontabular rows starting at the apical horn, crossing the paracingulum and terminating at the single antapical horn. Planar paracingulum delineated by two slightly raised parasutural ridges; parasulcus not defined, individual paraplates not discernible. Archeoplye unknown.
Dimensions: 48-67 Ám long and 46-60 Ám broad.
Affinities:
Morgan, 1977, p. 137: The subcircular ambitus and dense aligned granules are characteristic of. L. tenuistriatum. For comparisons to other species, see treatnem of. L. inflatum.