Difference between revisions of "Wrevittia helicoidea"

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Revision as of 16:28, 4 December 2016

*helicoidea (Eisenack and Cookson, 1960, p.2-3, pl.1, figs.4-6,9 [figs.5-6 are now Wrevittia cassidata]) Helenes and Lucas-Clark, 1997, p.187.  Emendations: Sarjeant, 1966b, p.116, as Gonyaulacysta helicoidea; Helenes and Lucas-Clark, 1997, p.187-188, as Wrevittia helicoidea.  Holotype: Eisenack and Cookson, 1960, pl.1, fig.4; Jan du Chêne et al., 1986a, pl.40, figs.4-5.  Originally Gonyaulax (Appendix B), subsequently Gonyaulacysta, thirdly (and now) Wrevittia.  Taxonomic junior synonym: Gonyaulacysta (now Wrevittia?) diutina, according to Stover and Helby (1987d, p.287) -however, Jan du Chêne et al. (1986a, p.130) and Lentin and Williams (1989, p.152) retained Gonyaulacysta (now Wrevittia?) diutina.  Age: Neocomian-Aptian.


Wrevittia helicoidea1.jpgWrevittia helicoidea2.jpgWrevittia helicoidea3.jpgWrevittia helicoidea4.jpg
Parent: Wrevittia