Comparodinium aquilonium, Dörhöfer and Davies, 1980

Holotype: Dörhöfer and Davies, 1980, fig.26E
Locus typicus: Elf Wilkins E-60 well, 1950 ft., Mackenzie King Island, Sverdrup Basin, Arctic Canada
Stratum typicum: Toarcian to Bajocian-Bathonian

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Original diagnosis: [Dörhöfer and Davies, 1980, p. 24]:

Diagnosis:
A proximate dinoflagellate cyst with thin, but highly refractive autophragm, smooth with scattered granules. Outline elongated ovoidal, apically rounded to slightly pointed, antapically rounded.
Tabulation partially apparent from faint sutures 5", 5-6a, 6", ?c, ?""", ?"""",
Archeopyle 2A(3,4).

Dimensions:
Length 27(20) µm; breadth 19(23)25 µm.

Remark:
Normally no tabulation is apparent, except for the archeopyle outlined and accessory sutures. The faint cingulum is occasionally expressed. A hypotractal fold perpendicular to the long axis of the cyst is common.