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Meiourogonyaulax maculata
From Fensome et al., 2019:
Meiourogonyaulax maculata Backhouse, 1988, p.96, pl.32, figs.8,9a–b,10–11; text-figs.29A–B. Holotype: Backhouse, 1988, pl.32, figs.9a–b; text-figs.29A–B; Fensome et al., 1996, figs.2–3,6–7 — p.2217. Originally (and now) Meiourogonyaulax, subsequently Lithodinia. This species is retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83). Age: early Barremian.
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Locus typicus: Perth Basin, W Australia
Stratum typicum: Early Barremian
Original description: Backhouse, 1988, p.96
Small to medium proxlmate cyst, ovoid to lenticular, compressed laterally. Autophragm, less than 0.5 µm thick, usually entirely covered with small round dark grana of no descernible height, up to 1 µm in basal diameter; grana imparting a spotted appearance to the cyst. Some populations lack visible grana. Paracingulum approximately 5 µm wide, clearly expressed by low (less than 1 µm) narrow septa, offset 2 paracingulum widths. Details of parasulcus not usually observed because of lateral compression. Paratabulation on remainder of cyst weakly expressed by low septa; formula: ?4', 6'', Xc, 6''', 1p, 1''''. Archeopyle apical, type [tA], operculum free. Operculum bears a small truncate apical spine, 2 µm long.
Dimensions: Length of holotype without operculum 50 µm, width 51 µm. Range of length without operculum (31 specimens) 33(43)52 µm, width 41(40)60 mm. Length of one complete specimen 57 µm.
Affinities:
Backhouse, 1988, p.96: The spotted appearance, thin autophragm, and lateral compression distinguish if Meiourogonyaulax maculata from other species of the genus.
Meiourogonyaulax maculata Backhouse, 1988, p.96, pl.32, figs.8,9a–b,10–11; text-figs.29A–B. Holotype: Backhouse, 1988, pl.32, figs.9a–b; text-figs.29A–B; Fensome et al., 1996, figs.2–3,6–7 — p.2217. Originally (and now) Meiourogonyaulax, subsequently Lithodinia. This species is retained in Meiourogonyaulax following the retention of the genus by Riding and Helby (2001d, p.81,83). Age: early Barremian.
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Locus typicus: Perth Basin, W Australia
Stratum typicum: Early Barremian
Original description: Backhouse, 1988, p.96
Small to medium proxlmate cyst, ovoid to lenticular, compressed laterally. Autophragm, less than 0.5 µm thick, usually entirely covered with small round dark grana of no descernible height, up to 1 µm in basal diameter; grana imparting a spotted appearance to the cyst. Some populations lack visible grana. Paracingulum approximately 5 µm wide, clearly expressed by low (less than 1 µm) narrow septa, offset 2 paracingulum widths. Details of parasulcus not usually observed because of lateral compression. Paratabulation on remainder of cyst weakly expressed by low septa; formula: ?4', 6'', Xc, 6''', 1p, 1''''. Archeopyle apical, type [tA], operculum free. Operculum bears a small truncate apical spine, 2 µm long.
Dimensions: Length of holotype without operculum 50 µm, width 51 µm. Range of length without operculum (31 specimens) 33(43)52 µm, width 41(40)60 mm. Length of one complete specimen 57 µm.
Affinities:
Backhouse, 1988, p.96: The spotted appearance, thin autophragm, and lateral compression distinguish if Meiourogonyaulax maculata from other species of the genus.