Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | Syracosphaera borealis BCs with smooth rim - axial structure prominent irregular ridge or ring; XCs smooth eliptical discs, rare | ||
![]() | Syracosphaera exigua BCs with node-ridge ornament; XCs ornamented elliptical discs can cover coccosphere | |||
Syracosphaera pemmadiscus BCs with narrow, fluted, distal flange; XCs smooth elliptical discs with parenthesis shaped openings | ||||
![]() | Syracosphaera strigilis BCs with smooth rim - no real axial structure but irregular ring of isolated node; XCs smooth eliptical discs, with arcuate slits, rare |
Taxonomy:
Distinguishing features: XCs elliptical discs, with a narrow rim, central part without conical depression. CFCs not differentiated.
Farinacci & Howe catalog pages:
Search data:Tags | LITHS: |
Metrics | Lith size: 1->3µm; Coccosphere size: 6->12µm; |
Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in "Holocene" stage). Data source: Total of range of species in this database
Plot of occurrence data:
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borealis type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-4-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=144 Go to Archive.is to create a permanent copy of this page - citation notes |