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Spiniferites alaskensis

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

 
 
 
dorsal view
Material: Emian, Gulf of Alaska
(Fabienne Marret)
photographs: Karin Zonneveld
cross section
ventral view

Field characteristics

Spiniferites alaskasensis Marret et al., 2001

Field characteristics:
Chorate cyst with ovoid-pear shape, with a pronounced apical boss. The cysts have a thin finely scabrate to granulate wall. Tabulation is expressed by low septa. Processes are relatively long, broad and divided in three pointed ends. Process end with a pointed trifurcation. Archeopyle is precingular (type P).

Dimensions: Cyst body: 26.2 - 36.8 (length) to 23.6 - 31.5 (width) µm; length of processes: 7.5 - 12 µm. Motile affinity: not known.
Stratigraphic range: Emian

Comparison with other species:
S. alaskasense differs from the other Spiniferites species in having a broad processes that end characteristically in three branches.