without apical nodge

Zonneveld, K.A.F. and Pospelova V. (2015). A determination key for modern dinoflagellate cysts. Palynology 39 (3), 387- 407.

spherical cyst
trifurcate processes
thick granulate to reticulate wall
Spiniferites pachydermus +

spherical cyst
trifurcate and sometimes bifurcate processes
smooth wall
process length about 2/3th of body diameter
Spiniferites ramosus subsp. ... +

subspherical cysts
trifurcate and bifurcate processes
septa almost absent
Spiniferites hyperacanthus +

subspherical cyst
microgranulate to microreticulate wall
processes have a central rod
process tips petaloid
no apical protusion
Spiniferites delicatus +