Tranolithus macleodiae

Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Tranolithus -> Tranolithus macleodiae
Sister taxa: T. bitraversus, T. gabalus, T. incus, T. macleodiae, T. minimus, T. orionatus, T. praeorionatus, T. salillum, T. stemmerikii, T. sp.,

Distinguishing features: Projections are a pair of perforate angular blocks.


Citation: Tranolithus macleodiae (Bukry, 1969) Perch-Nielsen, 1984
Rank: Species
Basionym: Zygodiscus macleodae Bukry, 1969
Variants: Zygodiscus biclavatus Bukry, 1969 - slightly larger form with less symmetrical pair of perforate blocks [my interpretation - JRY 2015]
Zygodiscus tarboulensis Shafik & Stradner (1971) - more asymmetric

Farinacci & Howe catalog pages: Zygodiscus macleodae * , Zygodiscus biclavatus * , Zygodiscus tarboulensis *

Distinguishing features: Projections are a pair of perforate angular blocks.

Search data:
TagsLITHS: murolith, elliptical, CA: process, bar, V-UNITS: V-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 4->7┬Ám;
Sources: original descriptions
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Burnett 1998
First occurrence (base): within Campanian Stage (72.05-83.64Ma, base in Campanian stage). Data source: Burnett 1998

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Tranolithus


    Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

    Perch-Nielsen, K. (1973). Neue Coccolithen aus dem Maastrichtien von Danemark, Madagaskar und Agypten. Geological Society of Denmark, Bulletin. 22: 306-333. gs

    Perch-Nielsen, K. (1984). Validation of new combinations. INA Newsletter. 6(1): 42-46. gs

    Shafik, S. & Stradner, H. (1971). Nannofossils from the Eastern Desert, Egypt. Jahrbuch der Geologischen Bundesanstalt Sonderband. 17: 69-104. gs


    Tranolithus macleodiae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-3-2020

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    Short stable page link: Go to to create a permanent copy of this page - citation notes

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