Back
Dracodinium politum ssp. spinulum
Dracodinium politum ssp. spinulum Islam, 1983
NOW Petalodinium spinulum. Originally Dracodinium politum subsp. spinulum, subsequently (and now) Petalodinium spinulum.
Holotype: Islam, 1983, pl.2, fig.4
Locus typicus: Isle of Sheppey, SE England
Stratum typicum: Early Eocene
Original diagnosis: Islam, 1983, p.236
A subspecies of D. politum Bujak et al. differing from the type in possessing 8 reticulate endophragm bearing spines or grana of up to 3µ across and 3µ height, both solid; and a chagrinate peripbragm bearing spines of similar height which are hollow, proximally open, distally closed, or open probably by breakage.
Dimensions: Holotype: pericyst 135x142 µm, endocyst 58x68 µm. Range: pericyst length 140(128)110 µm breadth 142(139)120 µm; endocyst length 68(60)59 µm; breadth 68(65)59 µm. Specimens measured 8.
Affinities:
Islam, 1983, p.236: Forms with partly cronulate pericyst ambitus but lacking real spines are referred to D. politum Bujak et al. and thought to represent a probable intermediate phyletic position.
NOW Petalodinium spinulum. Originally Dracodinium politum subsp. spinulum, subsequently (and now) Petalodinium spinulum.
Holotype: Islam, 1983, pl.2, fig.4
Locus typicus: Isle of Sheppey, SE England
Stratum typicum: Early Eocene
Original diagnosis: Islam, 1983, p.236
A subspecies of D. politum Bujak et al. differing from the type in possessing 8 reticulate endophragm bearing spines or grana of up to 3µ across and 3µ height, both solid; and a chagrinate peripbragm bearing spines of similar height which are hollow, proximally open, distally closed, or open probably by breakage.
Dimensions: Holotype: pericyst 135x142 µm, endocyst 58x68 µm. Range: pericyst length 140(128)110 µm breadth 142(139)120 µm; endocyst length 68(60)59 µm; breadth 68(65)59 µm. Specimens measured 8.
Affinities:
Islam, 1983, p.236: Forms with partly cronulate pericyst ambitus but lacking real spines are referred to D. politum Bujak et al. and thought to represent a probable intermediate phyletic position.