Nannotax3 - ntax_cenozoic

Nannotax3 - ntax_cenozoic - Lophodolithus Nannotax3 - ntax_cenozoic - Lophodolithus

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

PN81fig2-4.JPG

Taxonomy:

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:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Zygodiscaceae

References:

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

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=829 Go to Archive.is to create a permanent copy of this page - citation notes

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