Daughter taxa (time control age-window is: 0-800Ma)![]() | Granddaughter taxa | ||||
![]() | ![]() | ![]() | ![]() | Blackites bipartitus Spine vase-shaped constructed from two distinct structural units when viewed in XPL. Typically the height is about 2x the width, and the maximum spine width is similar to base width. | |
![]() | ![]() | ![]() | Blackites clavus Spine short and tapers rapidly to a point. Typically the spine height is similar to base width. The rim is relatively broad and the outer cycle is small and does not lie distally over the inner cycle. In overall shape the coccolith and spine resemble a short nail or pin. | ||
![]() | ![]() | Blackites dupuisii Spine tall, tapering, hollow; broad at its base but tapering and narrow in its upper half. Two or three spine-cycles are seen low on the spine, along with striated ornamentation. Spine height is usually 2-3x basal width. | |||
![]() | ![]() | ![]() | Blackites gamai Spine broad, hollow, bullet-shaped; initially broadens slightly before tapering gently to a point. Typically the height of the spine is greater than the basal width. | ||
![]() | ![]() | ![]() | ![]() | Blackites spiculiformis Rhabdolith coccolith with a Blackites gladius-like rim and a relatively short, narrow, tapering, hollow spine that may incorporate a basal collar. | |
![]() | ![]() | Blackites thiedei |
Taxonomy:
Distinguishing features:
Parent taxon (Blackites): Coccoliths process-bearing with complex base including outer rim, radial lath and lamellar cycles
This taxon: Spine conical, tapering with maximum width near base
Farinacci & Howe catalog pages:
Size:
Lith size: 5->12µm; |
Geological Range:
Last occurrence (top): at top of NP16 zone (100% up, 40.4Ma, in Bartonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NP10 zone (54.17-55.86Ma, base in Ypresian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
![]() |
B. clavus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-2-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=58 Go to Archive.is to create a permanent copy of this page - citation notes |
![]() |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments