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Fusiformacysta tumida
Fusiformacysta tumida Backhouse, 1988
Holotype: Backhouse, 1988, pl.29, fig.5
Locus typicus: Perth Basin, Western Australia
Stratum typicum: Late Thithonian-?earliest Valanginian
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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.
Fusiformacysta tumida Backhouse, 1988. Broad rounded apical horn, shorter antapical horn, granulate. Archeopyle P(3") plus one other paraplate. Operculum often in position. Size: length 79-99 µm, width 46-60 µm.
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Original description: Backhouse, 1988, p.86
Medium-sized proximate cysts, inflated fusiform in shape, drawn into a broad rounded apical horn of varying length and a shorter antapical horn. Autophragm less than 0.5 Ám thick, completely covered by evenly spaced grana less than 0.5 Ám high and less than 1 Ám in diameter. Paratabulation indicated only by archeopyle. Paracingulum and parasulcus not expressed. Archeopyle precingular, formed by loss of 3" paraplate and usually one other paraplate: operculum often in position.
Dimensions: Length of holotype 90 Ám, width 57 Ám. Range of length (22 specimens) 79(87)99 Ám, width 46(54)60 Ám.
Affinities:
Backhouse, 1988, p.86: Fusiformacysta tumida is shorter and more inflated in shape than F. salasii Morgan 1975. All occurrences are in sediments of probable restricted-marine or non-marine origin. This supports the observations of Morgan (1975) who noted that a similar species, F. salasii, occurs in poorly diversified dinoflagellate-cyst assemblages of possibly non-marine origin.
Holotype: Backhouse, 1988, pl.29, fig.5
Locus typicus: Perth Basin, Western Australia
Stratum typicum: Late Thithonian-?earliest Valanginian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Fusiformacysta tumida Backhouse, 1988. Broad rounded apical horn, shorter antapical horn, granulate. Archeopyle P(3") plus one other paraplate. Operculum often in position. Size: length 79-99 µm, width 46-60 µm.
--------------------------------------------------
Original description: Backhouse, 1988, p.86
Medium-sized proximate cysts, inflated fusiform in shape, drawn into a broad rounded apical horn of varying length and a shorter antapical horn. Autophragm less than 0.5 Ám thick, completely covered by evenly spaced grana less than 0.5 Ám high and less than 1 Ám in diameter. Paratabulation indicated only by archeopyle. Paracingulum and parasulcus not expressed. Archeopyle precingular, formed by loss of 3" paraplate and usually one other paraplate: operculum often in position.
Dimensions: Length of holotype 90 Ám, width 57 Ám. Range of length (22 specimens) 79(87)99 Ám, width 46(54)60 Ám.
Affinities:
Backhouse, 1988, p.86: Fusiformacysta tumida is shorter and more inflated in shape than F. salasii Morgan 1975. All occurrences are in sediments of probable restricted-marine or non-marine origin. This supports the observations of Morgan (1975) who noted that a similar species, F. salasii, occurs in poorly diversified dinoflagellate-cyst assemblages of possibly non-marine origin.