Australisphaera DAVEY 1978 emend. DUXBURY 1983

Emended diagnosis:

"Proximate, ceratiacean dinoflagellate cysts which are single-walled, dorso-ventrally flattened and have lateral and antapical features developed as unusually high ornament or low to high, hollow, distally closed horns. Overall, the ornament may be low, but spines may occur, usually concentrated at horn terminations, sometimes extending the horns considerably. Vague paratabulation may be indicated by ornament alignment. The archeopyle is apical with a zig-zag margin and the parasulcus is offset to the left of the mid-line." - From Duxbury (1983, p. 25).

Note:

The genus Australisphaera Davey 1978 has later been emended by Harding (1986a, p. 100), however, see Harding (1990b, p. 21).

(See Williams et al., 1998).



Australisphaera dolabella DUXBURY 1983

Holotype
Pl. 3, fig(s). 11
NHM registration number: FD48(1)
 

Transmitted light images:

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Dorsal face in high focus
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Ventral face in low focus
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Ventral face in low focus
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Lateral horns in lowest focus
 

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 very thin-walled species of Australisphaera having two lateral and two antapical horns. The lateral horns are short, broad and distally bear two short, digitate projections which are of approximately equal length. The distal termination of each lateral horn is characteristically hatchet-shaped. The antapical horns comprise one which is long and curved and one which is short and digitate. The body surface has isolated, usually linear, granular areas and the archeopyle is apical." - From Duxbury (1983, p. 25).

Note:

This species has later been transferred to the genus Vesperopsis Bint 1986. Now: Vesperopsis dolabella (Duxbury 1983) Bint 1986.

Bint (1986, p. 156) suggested that Muderongia? digitata Duxbury 1983 [Now = Vesperopsis digitata (Duxbury 1983) Bint 1986] is a possible taxonomic synonym of this species.

(See Williams et al., 1998).