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Spiniferites ramosus ssp. primaevus
Spiniferites ramosus ssp. primaevus Duxbury 1977
Now Spiniferites primaevus. Originally Spiniferites ramosus ssp. primaevus, subsequently (and now) Spiniferites primaevus.
Holotype: Duxbury, 1977, pl.4, figs.2–3.
Occurence: Speeton Clay, Speeton, England
Age: Valanginian
Original diagnosis: Duxbury, 1977, p. 50
A chorate cyst possessing both gonal and sutural processes. The gonal processes trifurcate, terminating in three flat, distally expanded spines. These terminal spines may be of varying form. They are sometimes distally finely denticulate, sometimes laterally joined by thin trabeculae (on a given process - no connection between processes was observed) and sometimes ending in a distinct bifurcation. Sutural processes may be distally bifurcate. Both gonal and sutural processes may be distally perforate, sometimes approadling smallscale fenestration.
Observed Dimensions: Main Body 51(46)42 x 44(37)33 µm. Overall 75(69)64 x 73(63)55 µm.
Remark:
Duxbury 1977, p.50: This subspecies differs from all other subspecies of Spiniferites ramosus in the form of the process terminations, particularly in the tendency towards small-scale fenestration and towards distal trabecular connection of terminal spines on a given process.
Now Spiniferites primaevus. Originally Spiniferites ramosus ssp. primaevus, subsequently (and now) Spiniferites primaevus.
Holotype: Duxbury, 1977, pl.4, figs.2–3.
Occurence: Speeton Clay, Speeton, England
Age: Valanginian
Original diagnosis: Duxbury, 1977, p. 50
A chorate cyst possessing both gonal and sutural processes. The gonal processes trifurcate, terminating in three flat, distally expanded spines. These terminal spines may be of varying form. They are sometimes distally finely denticulate, sometimes laterally joined by thin trabeculae (on a given process - no connection between processes was observed) and sometimes ending in a distinct bifurcation. Sutural processes may be distally bifurcate. Both gonal and sutural processes may be distally perforate, sometimes approadling smallscale fenestration.
Observed Dimensions: Main Body 51(46)42 x 44(37)33 µm. Overall 75(69)64 x 73(63)55 µm.
Remark:
Duxbury 1977, p.50: This subspecies differs from all other subspecies of Spiniferites ramosus in the form of the process terminations, particularly in the tendency towards small-scale fenestration and towards distal trabecular connection of terminal spines on a given process.