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Lentinia serrata
Lentinia serrata Bujak in Bujak et al., 1980
Holotype: Bujak in Bujak et al., 1980, pl.18, figs.7-9, text-figs.18A-F
Paratypes: Bujak in Bujak et al., 1980
Locys typicus: Barton, Hampshire, S England
Stratum typicum: Late Eocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Lentinia serrata Bujak in Bujak et al., 1980. Diagnosis as for genus but always denticulate. Size: pericyst length 42-63 µm, width 32-55 µm, length of apical horn 3-7 µm, length of antapical horns 4-12 µm, length of denticles up to 2 µm. Longitudinal archeopyle index = 0.5, archeopyle ratio = 0.7
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Original description: Bujak in Bujak et al., 1980, p.71
Diagnosis: Apical horn smaller than the antapical horns, but distinct from the remaining epipericyst. Right antapical horn often slightly smaller than the left. Endocyst rounded peridinioid. Pericoels cornucavate when present. Periphragm laevigate to chagrinate, always denticulate along the pericingular margins, variably denticulate elsewhere on the periphragm surface and strongly denticulate on the horns. A peritabulation of 4', 3a, 7'', 5''', 2'''' may be delimited by the denticles. Pericingulum planar or slightly helicoidal. perisulcus marked by an indentation that is broad on the hypocyst, narrowing anteriorly on the epicyst.
Periarchaeopyle broad hexa intercalary, resulting from the loss of paraplate 2a. Transverse archaeopyle index = 0.8. Longitudinal archaeopyle index = 0.5. Archaeopyle ratio = 0.7. The endoarchaeopyle is adjacent to the periarchaeopyle and has the same size and shape.
Dimensions: Pericyst length = 42-63 Ám, breadth = 32-55 Ám, thickness = 24-35 Ám. Apical horn length = 3-7 Ám, antapical horn length = 4-12 Ám, length of denticles up to 2 Ám. Number of specimens measured = 63 in side view, 23 in polar view.
Affinities:
Bujak in Bujak et al., 1980, p.71-72
Lentinia serrata differs from L. wetzelii in pericyst shape. The pericyst of L. serrata is broadest at the pericingulum, so that the pericyst ambitus tapers strongly from the pericingulum to the apical and antapical horns. In L. wetzelii the pericyst has similar breadth in the pericingular, cingular, and postcingular regions. Pericoel development also differs in the two species, being greater in L. wetzelii than in L. serrata. This is particularly noticeable beneath the apical horn, as L. serrata usually has no apical pericoel.
Holotype: Bujak in Bujak et al., 1980, pl.18, figs.7-9, text-figs.18A-F
Paratypes: Bujak in Bujak et al., 1980
Locys typicus: Barton, Hampshire, S England
Stratum typicum: Late Eocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Lentinia serrata Bujak in Bujak et al., 1980. Diagnosis as for genus but always denticulate. Size: pericyst length 42-63 µm, width 32-55 µm, length of apical horn 3-7 µm, length of antapical horns 4-12 µm, length of denticles up to 2 µm. Longitudinal archeopyle index = 0.5, archeopyle ratio = 0.7
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Original description: Bujak in Bujak et al., 1980, p.71
Diagnosis: Apical horn smaller than the antapical horns, but distinct from the remaining epipericyst. Right antapical horn often slightly smaller than the left. Endocyst rounded peridinioid. Pericoels cornucavate when present. Periphragm laevigate to chagrinate, always denticulate along the pericingular margins, variably denticulate elsewhere on the periphragm surface and strongly denticulate on the horns. A peritabulation of 4', 3a, 7'', 5''', 2'''' may be delimited by the denticles. Pericingulum planar or slightly helicoidal. perisulcus marked by an indentation that is broad on the hypocyst, narrowing anteriorly on the epicyst.
Periarchaeopyle broad hexa intercalary, resulting from the loss of paraplate 2a. Transverse archaeopyle index = 0.8. Longitudinal archaeopyle index = 0.5. Archaeopyle ratio = 0.7. The endoarchaeopyle is adjacent to the periarchaeopyle and has the same size and shape.
Dimensions: Pericyst length = 42-63 Ám, breadth = 32-55 Ám, thickness = 24-35 Ám. Apical horn length = 3-7 Ám, antapical horn length = 4-12 Ám, length of denticles up to 2 Ám. Number of specimens measured = 63 in side view, 23 in polar view.
Affinities:
Bujak in Bujak et al., 1980, p.71-72
Lentinia serrata differs from L. wetzelii in pericyst shape. The pericyst of L. serrata is broadest at the pericingulum, so that the pericyst ambitus tapers strongly from the pericingulum to the apical and antapical horns. In L. wetzelii the pericyst has similar breadth in the pericingular, cingular, and postcingular regions. Pericoel development also differs in the two species, being greater in L. wetzelii than in L. serrata. This is particularly noticeable beneath the apical horn, as L. serrata usually has no apical pericoel.