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Senegalinium orei
Senegalinium orei (Jan du Chêne and Adediran, 1985) Stover and Williams, 1987
Originally Lentinia, subsequently (and now) Senegalinium.
Holotype: Jan du Chêne and Adediran, 1985, pl.1, fig.3
Locus typicus: Benin-Ore Highway, Km 41, Nigeria
Stratum typicum: Late Palaeocene-early Eocene
Original description: Jan du Chêne and Adediran, 1985, p. 29: Lentinia orei
Cyst proximate, cornucavate with a typically peridinoid shape, prolonged into one short, pointed apical hom and two longer symmetrically-located, antapical horns of more or less equal length. The endophragrn is pentagonal and closely appressed to the periphragm except at the bases of the apical and antapical horns. The pericoels are extremely reduced; the endocyst may protrude slightly into the antapical horns. The periphragm is irregularly granulate. The characteristic penitabular ornamentation is difficult to observe. The paracingulum is well defined and is interrupted by the parasulcal furrow. The periarcheopyle is of hexa-type and corresponds to the 2a paraplate. The operculum is free but may remain adherent to the cyst on some specimens.
Dimensions: Range: overall length 82-100 µm, overall width 50-64 µm (4 specimens measured).
Affinities:
Jan du Chêne and Adediran, 1985 , p. 29: Lentinia orei
Bujak (1980) attributed two species to his genus: Lentinia serrata which shows a coarse denticulate omamentation absent in our specimens, and Lentinia wetzelii which has a pericyst with similar breadth in the precingular, cingular and postcingular area. The pericoels are much larger in L. wetzelii than in L. serrata and L. orei.
Originally Lentinia, subsequently (and now) Senegalinium.
Holotype: Jan du Chêne and Adediran, 1985, pl.1, fig.3
Locus typicus: Benin-Ore Highway, Km 41, Nigeria
Stratum typicum: Late Palaeocene-early Eocene
Original description: Jan du Chêne and Adediran, 1985, p. 29: Lentinia orei
Cyst proximate, cornucavate with a typically peridinoid shape, prolonged into one short, pointed apical hom and two longer symmetrically-located, antapical horns of more or less equal length. The endophragrn is pentagonal and closely appressed to the periphragm except at the bases of the apical and antapical horns. The pericoels are extremely reduced; the endocyst may protrude slightly into the antapical horns. The periphragm is irregularly granulate. The characteristic penitabular ornamentation is difficult to observe. The paracingulum is well defined and is interrupted by the parasulcal furrow. The periarcheopyle is of hexa-type and corresponds to the 2a paraplate. The operculum is free but may remain adherent to the cyst on some specimens.
Dimensions: Range: overall length 82-100 µm, overall width 50-64 µm (4 specimens measured).
Affinities:
Jan du Chêne and Adediran, 1985 , p. 29: Lentinia orei
Bujak (1980) attributed two species to his genus: Lentinia serrata which shows a coarse denticulate omamentation absent in our specimens, and Lentinia wetzelii which has a pericyst with similar breadth in the precingular, cingular and postcingular area. The pericoels are much larger in L. wetzelii than in L. serrata and L. orei.