Occisucysta? echinata DUXBURY 1983

Holotype
Pl. 4, fig(s). 12, 13
NHM registration number: FD61(3)
 

Transmitted light images:

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Dorsal face in high focus
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Optical section focused to show the outline of the cyst
 

CLSM stills:

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Maximum Projection
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Shadow Projection
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Red/Green Anaglyph
 

CLSM movies:


Extended focus animation

Movie through the image stack
 

Original diagnosis:

"A proximate to proximo-cavate dinoflagellate cyst species which is spheroidal to ovoidal in shape and which is surmounted by a prominent, notably cavate apical horn. A crude reticulum, in the form of low, punctate muri, extends over the whole body surface. Numerous spines arise from the reticulum and these may be proximally vacuolate to such a degree that localised or extensive cavation may result. An ectophragm covers the reticulum but leaves the distal ends of the spines free. The ectophragm bears low paracingular and parasutural crests which are perforate, finely denticulate distally and which mark out a typically gonyaulacacean paratabulation pattern. Some small grana and/or coni may be present on the ectophragm surface. The archeopyle is formed by detachment of paraplates 2” and 3”." - From Duxbury (1983, p. 51).

Note:

This species has later been emended by Jan du Chêne et al. (1986b, p. 17-18).

(See Williams et al., 1998).