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Arkellea
From Williams et al., 2017:
[Arkellea, Below, 1990, p. 42
Type species: originally as Cymatiosphaera teichophera, Sarjeant, 1961a (pl.15, fig.9; text-figs.9a–b)] ; Arkellea teichophaera, Below, 1990
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Original description: [Below, 1990]: (Translation: LPP):
Diagnosis:
Vesicle organisation/tabulation of dinoflagellate amphiesma cop, pop, cap, 3`, 2a, 6``, 7c, 6```, 2````, as, FM, ls, rs, ps; 1` exsert with adelopore on suture 1`/6``; 1a and 2a pentagonal. Growth of thecal plates ?Gonyaulacoid. Zygote cyst proximate, proximochorate, chorate, acavate, cavate, ovoidal to elongate, ovaloidal, ellipsoidal, polyhedrical, including apical horn. Wall smooth, ornamented, paratabulation may be expressed by finate or limbate ornaments.
Paratabulation: NR PR/XPR/cop, pop, cap, NR`/3`, NRa/2a[arch], 3a[arch]/2a, NR``/6``, NRc/7c, NR```/6```, NR````/2````, NRs/Xs/as, ls, rs, ps;1a and 2a pentagonal; archaeopyle anterior intercalary, 1a+2a; operculum solvate, opercular plates secate, general opercular formula 1a[s]+2a[s].Arkellea
Affinities:
Arkellea differs from Paragonyaulacysta in the shape of 1a and 2a (pentagonal) and their different relation to 3`` and 4``. Arkellea differs from Gochteodinia in showing paratabulation.
[Arkellea, Below, 1990, p. 42
Type species: originally as Cymatiosphaera teichophera, Sarjeant, 1961a (pl.15, fig.9; text-figs.9a–b)] ; Arkellea teichophaera, Below, 1990
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Below, 1990]: (Translation: LPP):
Diagnosis:
Vesicle organisation/tabulation of dinoflagellate amphiesma cop, pop, cap, 3`, 2a, 6``, 7c, 6```, 2````, as, FM, ls, rs, ps; 1` exsert with adelopore on suture 1`/6``; 1a and 2a pentagonal. Growth of thecal plates ?Gonyaulacoid. Zygote cyst proximate, proximochorate, chorate, acavate, cavate, ovoidal to elongate, ovaloidal, ellipsoidal, polyhedrical, including apical horn. Wall smooth, ornamented, paratabulation may be expressed by finate or limbate ornaments.
Paratabulation: NR PR/XPR/cop, pop, cap, NR`/3`, NRa/2a[arch], 3a[arch]/2a, NR``/6``, NRc/7c, NR```/6```, NR````/2````, NRs/Xs/as, ls, rs, ps;1a and 2a pentagonal; archaeopyle anterior intercalary, 1a+2a; operculum solvate, opercular plates secate, general opercular formula 1a[s]+2a[s].Arkellea
Affinities:
Arkellea differs from Paragonyaulacysta in the shape of 1a and 2a (pentagonal) and their different relation to 3`` and 4``. Arkellea differs from Gochteodinia in showing paratabulation.