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Trabeculidium
From Williams et al., 2017:
[Trabeculodinium, Duxbury, 1980, p. 132-133
Tax. jr. syn. of Nematosphaeropsis Deflandre and Cookson, 1955, according to Stover and Williams, 1987, and Jan du Chêne, 1988. Sarjeant, 1989, retained Trabeculidium as a separate genus.
Type species: Trabeculodinium quinquetrum, Duxbury, 1980 (pl.9, fig.2)]
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Original description: [Duxbury, 1980]:
Diagnosis:
Spheroidal, ovoidal or rhomboidal dinoflagellate cysts bearing gonal and parasutural processes. The gonal processes are distally trifurcate and the parasutural ones bifurcate. Parasutural crests or other proximal indicators of paratabulation are absent. The distal extremes of process furcations are connected by slender trabeculae so that paratabulation is reflected in a distal trabecular network; each parasuture is marked by a double trabeculum. The distal trabecular network marks a gonyaulacacean paratabulation pattern.
The archeopyle is precingular (3``).
Affinities: (p. 30):
Species referable to this genus are basically similar in morphology to Achomosphaera Evitt, 1963 except that whereas Achomosphaera has processes which are distally free, Trabeculidium has distal trabeculae joining adjacent process tips. The gonal processes are trifurcate with the double trabeculum marking each parasuture originating on adjacent trifurcations. This involves the trifurcations each being at about 60¦ to the parasutural direction. Parasutural processes are bifurcate and at right angles to the parasutural direction, giving a "telegraph pole" effect.
[Trabeculodinium, Duxbury, 1980, p. 132-133
Tax. jr. syn. of Nematosphaeropsis Deflandre and Cookson, 1955, according to Stover and Williams, 1987, and Jan du Chêne, 1988. Sarjeant, 1989, retained Trabeculidium as a separate genus.
Type species: Trabeculodinium quinquetrum, Duxbury, 1980 (pl.9, fig.2)]
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Original description: [Duxbury, 1980]:
Diagnosis:
Spheroidal, ovoidal or rhomboidal dinoflagellate cysts bearing gonal and parasutural processes. The gonal processes are distally trifurcate and the parasutural ones bifurcate. Parasutural crests or other proximal indicators of paratabulation are absent. The distal extremes of process furcations are connected by slender trabeculae so that paratabulation is reflected in a distal trabecular network; each parasuture is marked by a double trabeculum. The distal trabecular network marks a gonyaulacacean paratabulation pattern.
The archeopyle is precingular (3``).
Affinities: (p. 30):
Species referable to this genus are basically similar in morphology to Achomosphaera Evitt, 1963 except that whereas Achomosphaera has processes which are distally free, Trabeculidium has distal trabeculae joining adjacent process tips. The gonal processes are trifurcate with the double trabeculum marking each parasuture originating on adjacent trifurcations. This involves the trifurcations each being at about 60¦ to the parasutural direction. Parasutural processes are bifurcate and at right angles to the parasutural direction, giving a "telegraph pole" effect.