Classification: ntax_cenozoic -> Holococcoliths -> bridged -> Poritectolithus
Sister taxa: Corisphaera, Helladosphaera, Homozygosphaera, Poritectolithus, S. anthos HOL

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


Citation: Poritectolithus Kleijne, 1991
Rank: Genus
Type species: Helladosphaera poritectum Heimdal, in Heimdal and Gaarder, 1980

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:
TagsLITHS: holococcolith, elliptical, hollow, CA: bar,
CSPH: equant, elongated, CFC, CROSS-POLARS: R-prominent, T-prominent,
MetricsLith size: 1.2->2.8µm; Coccosphere size: 8->20µm;
The morphological data given here can be used on the advanced search page. See also these notes

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. gs


Poritectolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-7-2021

Taxon Search:
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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

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