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Operculodinium giganteum
Operculodinium giganteum Wall, 1967
Holotype: Wall, 1967, pl.16, figs.9-10
Locus typicus: Core A254/327, depth 420cm. Yucatan basin (20¦ 45" N., 83¦ 00" W.)
Stratum typicum: Pleistocene-Holocene
Original diagnosis: Wall, 1967, p. 112
A very large, polyhedral species bearing numerous short capitate spines and possessmg traces of tabulation.
Dimensions: Test only 74-86 Ám, maximum dimensions, spines 2-4 Ám. 10 specimens.
Original description: Wall, 1967, p. 112
The test is polyhedral with broadly truncated extremities. The wall is microreticulate or microgranular and bears numerous tiny spines. Some of these are aligned either side of suture-like lines on the test and appear to reflect a gonyaulacid tabulation where there is a small posterior intercalary plate-area and a subrectangular 6"" plate-arca. Full details were not determined. The girdle is equatorial, narrow, and descending and the furrow is also very narrow and marked by two parallel rows of spines. Thearcheopyle is dorsal and precingular (3""). The spines have conical bases and capitate tips.
Holotype: Wall, 1967, pl.16, figs.9-10
Locus typicus: Core A254/327, depth 420cm. Yucatan basin (20¦ 45" N., 83¦ 00" W.)
Stratum typicum: Pleistocene-Holocene
Original diagnosis: Wall, 1967, p. 112
A very large, polyhedral species bearing numerous short capitate spines and possessmg traces of tabulation.
Dimensions: Test only 74-86 Ám, maximum dimensions, spines 2-4 Ám. 10 specimens.
Original description: Wall, 1967, p. 112
The test is polyhedral with broadly truncated extremities. The wall is microreticulate or microgranular and bears numerous tiny spines. Some of these are aligned either side of suture-like lines on the test and appear to reflect a gonyaulacid tabulation where there is a small posterior intercalary plate-area and a subrectangular 6"" plate-arca. Full details were not determined. The girdle is equatorial, narrow, and descending and the furrow is also very narrow and marked by two parallel rows of spines. Thearcheopyle is dorsal and precingular (3""). The spines have conical bases and capitate tips.