Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | Poritectolithus maximus BCs tube about 4 crystallites high, with basal flange and row of pores above; convex strings of small crystallites form a high bridge CFCs tube raised at sides; well developed leaf. | ||
![]() | Poritectolithus poritectus BCs tube about 4 crystallites high with basal flange. Bridge modified into long mound ex. CFCs tube raised at sides; well-developed leaf. | |||
![]() | ![]() | Poritectolithus tyronus Like P. poritectum but less convex and CFC leaf terminated in narrow spinelet (distinction of these two species may prove unsound). | ||
Poritectolithus sp. Specimens which cannot be assigned to established species |
Taxonomy:
Distinguishing features: Dimorphic; BCs with bridge formed of sub-parallel strings of crystallites.
CFCs bridge narrower and extended into leaf (helladoliths)
Farinacci & Howe catalog pages: Poritectolithus *
Search data:Tags | LITHS: holococcolith, elliptical, hollow, CA: bar, CSPH: equant, elongated, CFC, CROSS-POLARS: R-prominent, T-prominent, |
Metrics | Lith size: 1.2->2.8µm; Coccosphere size: 8->20µm; |
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:
Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gsReferences:
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Poritectolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1112 Go to Archive.is to create a permanent copy of this page - citation notes |