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Cribroperidinium longicorne
From Fensome et al., 2019:
Cribroperidinium ?longicorne (Downie, 1957, p.420, pl.20, fig.8; text-figs.2a–b) Lentin and Williams, 1985, p.79. Holotype: Downie, 1957, pl.20, fig.8; text-figs.2a–b; Jan du Chêne et al., 1986a, pl.30, fig.1. Originally Gonyaulax (Appendix B), subsequently Gonyaulacysta, thirdly Gonyaulacysta?, fourthly Millioudodinium, fifthly (and now)
Cribroperidinium?. Questionable assignment: Lentin and Williams (1985, p.79). Age: late Kimmeridgian.
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Original description: [Downie, 1957]:
Gonyaulax longicornis sp. nov.
Pl. XX, fig. 8 ; Text-fig. 2a and b
Diagnosis.-- The test is approximately equidimensional and has a very long apical horn with a solid tip, developed from plate 1'. The length of the horn is about one-third of the total length. Fine striations run round it near the base. The spiral equatorial furrow divides the test into roughly equal parts. The longitudinal furrow is wide and less distinct. The tabulation is 4', 6", 6" ', 1" ", the plates being flat or slightly convex. The
sutures have low flanges, at times very faint, and bear tiny spines that are prominent only where the sutures join.
Dimensions of holotype.-- Length 92 microns; breadth 59 microns; length of horn 36 microns.
Holotype.--Slide KL 11.15 (author's collection).
Locality of type.--No. 13.
Other localities.--Nos. 7, 8 and 9.
Discussion.--This species was particularly common at Setchey where several well-preserved specimens were found. The long polar horn and
low sutures are not associated in any other species of Gonyaulax but the general form may be compared with Palaeoperidinium nudum sp. nov.
(p. 424).
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Transfer to Cribroperidinium by Lentin and Williams, 1985:
Cribroperidinium
?longicorne (Downie, 1957) comb. nov.
1957 Gonyaulax longicornis Downie, p.420, p1.20, fig.8. Late Kimmeridgian.
Also formerly ?Gonyaulacysta, then Millioudodinium. Because of uncertainty as to the tabulation mode, we consider the present generic assignment provisional.
Cribroperidinium ?longicorne (Downie, 1957, p.420, pl.20, fig.8; text-figs.2a–b) Lentin and Williams, 1985, p.79. Holotype: Downie, 1957, pl.20, fig.8; text-figs.2a–b; Jan du Chêne et al., 1986a, pl.30, fig.1. Originally Gonyaulax (Appendix B), subsequently Gonyaulacysta, thirdly Gonyaulacysta?, fourthly Millioudodinium, fifthly (and now)
Cribroperidinium?. Questionable assignment: Lentin and Williams (1985, p.79). Age: late Kimmeridgian.
---------------------------------------------------------------------------------------------------
Original description: [Downie, 1957]:
Gonyaulax longicornis sp. nov.
Pl. XX, fig. 8 ; Text-fig. 2a and b
Diagnosis.-- The test is approximately equidimensional and has a very long apical horn with a solid tip, developed from plate 1'. The length of the horn is about one-third of the total length. Fine striations run round it near the base. The spiral equatorial furrow divides the test into roughly equal parts. The longitudinal furrow is wide and less distinct. The tabulation is 4', 6", 6" ', 1" ", the plates being flat or slightly convex. The
sutures have low flanges, at times very faint, and bear tiny spines that are prominent only where the sutures join.
Dimensions of holotype.-- Length 92 microns; breadth 59 microns; length of horn 36 microns.
Holotype.--Slide KL 11.15 (author's collection).
Locality of type.--No. 13.
Other localities.--Nos. 7, 8 and 9.
Discussion.--This species was particularly common at Setchey where several well-preserved specimens were found. The long polar horn and
low sutures are not associated in any other species of Gonyaulax but the general form may be compared with Palaeoperidinium nudum sp. nov.
(p. 424).
---------------------------------------------------------------------------------------------------
Transfer to Cribroperidinium by Lentin and Williams, 1985:
Cribroperidinium
?longicorne (Downie, 1957) comb. nov.
1957 Gonyaulax longicornis Downie, p.420, p1.20, fig.8. Late Kimmeridgian.
Also formerly ?Gonyaulacysta, then Millioudodinium. Because of uncertainty as to the tabulation mode, we consider the present generic assignment provisional.