Back
Deflandrea tribulosa
Deflandrea tribulosa Islam 1983
Holotype: Islam, 1983, pl.1, fig.10
Paratype: Islam, 1983
Locus typicus: Sheppey, England
Stratum typicum: Middle Eocene
Original diagnosis: Islam, 1983, p. 85
Cyst dorsoventrally compressed peridinioid with short to moderate apical and two
antapical horns, horns low and conical with broad bases, antapical horns sometimes considerably reduced but themselves more or less equal; apical pore sometimes present; circumcavate to bicavate; both phragma chagrinate; periphragm bears sparsely distributed small spines, linear rows of spines border paracingulum, spines sometimes rounded looking like grana; archeopyle intercalary type l/I and of broad hexa-style.
Dimensions: Holotype: pericyst 62x47 Ám, endocyst 47x42 Ám. Range: pericyst length 55(60)68 Ám, breadth 42(48)54 Ám, endocyst length 42(44)48 Ám, breadth 36(46)53 Ám.
Affinities:
Islam, 1983, p. 85: This species differs from D. denticulata Alberti 1959 and D. spinulosa Alberti 1959 in smaller size and much reduced horns, and from the former also in possessing fewer spines.
Holotype: Islam, 1983, pl.1, fig.10
Paratype: Islam, 1983
Locus typicus: Sheppey, England
Stratum typicum: Middle Eocene
Original diagnosis: Islam, 1983, p. 85
Cyst dorsoventrally compressed peridinioid with short to moderate apical and two
antapical horns, horns low and conical with broad bases, antapical horns sometimes considerably reduced but themselves more or less equal; apical pore sometimes present; circumcavate to bicavate; both phragma chagrinate; periphragm bears sparsely distributed small spines, linear rows of spines border paracingulum, spines sometimes rounded looking like grana; archeopyle intercalary type l/I and of broad hexa-style.
Dimensions: Holotype: pericyst 62x47 Ám, endocyst 47x42 Ám. Range: pericyst length 55(60)68 Ám, breadth 42(48)54 Ám, endocyst length 42(44)48 Ám, breadth 36(46)53 Ám.
Affinities:
Islam, 1983, p. 85: This species differs from D. denticulata Alberti 1959 and D. spinulosa Alberti 1959 in smaller size and much reduced horns, and from the former also in possessing fewer spines.