Nannotax3 - ntax_cenozoic - Lophodolithus Nannotax3 - ntax_cenozoic - Lophodolithus


Classification: ntax_cenozoic -> Zygodiscales -> Zygodiscaceae -> Lophodolithus
Sister taxa: Lophodolithus, Neochiastozygus, Zygodiscus ⟩⟨ Chiphragmalithus, Isthmolithus, Neococcolithes, Nannotetrina

Daughter taxa (time control age-window is: 0-800Ma)
Lophodolithus acutus
Large Lophodolithus with an asymmetric wing at one end and a distinctive angular ‘corner’ at the other end, where the rim side and end meet. Central area with disjunct, complex, tranverse bar.
Lophodolithus luntii
Bilaterally symmetrical Lophodolithus without a bar
Lophodolithus mochlophorus
Large Lophodolithus with a broad, near-symmetric wing at one end and central area spanned by a disjunct tranverse bar. Rim is narrowly elliptical at the opposite end to the wing.
Lophodolithus mytiliformis
Strongly asymmetric Lophodolithus with prominent wing and wide bar
Lophodolithus nascens
Large, slightly asymmetric Lophodolithus with a narrow, asymmetric wing at one end; central area with disjunct tranverse bar.
Lophodolithus reniformis
Lophodolithus with kidney-shaped ouline.
Lophodolithus rotundus
Large to very large, broadly elliptical to subcircular Lophodolithus with a very broad (~half the length of the rim), near-symmetric wing at one end. No central area structures observed. Wing elements clearly visible in LM.
Lophodolithus sp.
Specimens which cannot be assigned to any established species


Citation: Lophodolithus Deflandre in Deflandre and Fert, 1954
taxonomic rank: Genus
Type species: Lophodolithus mochlophorus Deflandre in Deflandre & Fert, 1954

Distinguishing features:
Parent taxon (Zygodiscaceae): Muroliths with rim formed from well-developed V- and variably developed R-units, with opposite imbrication directions, and central area structures that include disjunct transverse bars and diagonal crosses. R-units vestigial or not observed in several genera (Chiphragmalithus, Isthmolithus, Neococcolithes).
This taxon: Modified muroliths with high walls (higher at one end and forming an asymmetric flange) and wide central area usually spanned by a disjunct, complex tranverse bar.

Farinacci & Howe catalog pages: Lophodolithus *

Search data:
LITHS: murolith, asymmetric, elliptical, CA: ca_disjunct, bar, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Lith size: 8->23µm;
The morphological data given here can be used on the advanced search page. See also these notes

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 NP6 zone (58.97-59.54Ma, base in Selandian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:


Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gs

Perch-Nielsen, K. (1981). New Maastrichtian and Paleocene calcareous nannofossils from Africa, Denmark, and USA and the Atlantic, and some Paleocene lineages. Eclogae Geologicae Helvetiae. 74(3): 831-863. gs O


Lophodolithus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-12-2023

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