Ceratolithus armatus
Classification: ntax_cenozoic -> Nannolith families inc sed -> Ceratolithaceae -> Ceratolithus -> Ceratolithus armatus
Sister taxa: C. cristatus, C. nishidae ⟩⟨ C. apiculus, C. armatus, C. atlanticus, C. larrymayeri, C. separatus, C. sp.
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Taxonomy:
Citation: Ceratolithus armatus Muller, 1974Rank: SpeciesVariants:
- Ceratolithus acutus Gartner and Bukry, 1974 - C. armatus and C. acutus were both described in 1974 from Indian Ocean sediments of Early Pliocene age (zone NN12, Sites 242 and 214 respectively). The holotypes, and paratypes, of the two species are very similar. The C. armatus specimens have slightly longer arms and more distinct ornament, but this is almost certainly a result of the much better preservation at Site 242. They are clearly synonyms, and probably not worth distinguishing, even at varietal level. According to the publication dates C. armatus has two months priority (May 1974 vs. July 1974). Nonetheless, several authors use both species. [Young 1998, p.238].
- Ceratolithus cornulum Blair & Bergen, in Blair et al. 2017. Form with long curved arms and smoothly curved apical region.
Blair et al. (2017) subdivide C. armatus into 4 species - C. acutus, C. armatus, C. cornulum and C. apiculus. For work on on expanded Early Pliocene sections with abundant ceratoliths this scheme may prove of value. For most work, however, it is superfluous.Taxonomic discussion: As explained in the variants section the correct name for this taxon is C. armatus, not C. acutus.
Distinguishing features: Left arm extends into apical spur producing a triangular apical area. Right arm longer than left
Farinacci & Howe catalog pages: C. armatus * , C. acutus * , C. cornulum *
Morphology: Dentate keels on upper surfae, especially right arm. Smooth keels on lower surface. C. armatus can be confused with random debris of similar shpaes, especially when it rare and preservation is indifferent. It is important in these circumstances to confirm identification by checking that the c-axis orientation is perpendicular to the length of the nannofossil.
Search data:
| Tags | LITHS: nannolith-other, asymmetric, horseshoe-shaped, CROSS-POLARS: 1ou, T-prominent, |
| Metrics | Lith size: 4->9µm; Segments: 1->1;
Data source notes: lith width from illustrated specimens |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Notes: C. armatus is normally recorded as confined to NN12. However, Blair et (2017) record the range as extending into in NN13, so caution should be used in use of the LAD. Records associated with the Messinian slaiity crisi are discussed by Popescu et al 2017
Last occurrence (top): at top of NN12 zone (100% up, 5.1Ma, in Zanclean stage). Data source: top is very close to top NN12 (Young 1998)
First occurrence (base): at base of NN12 zone (0% up, 5.6Ma, in Messinian stage). Data source: Young 1998
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
- Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
- Taxon plotted: Ceratolithus armatus, synonyms included - Ceratolithus acutus; Ceratolithus armatus;
- See also space-time plot ::
Samples map :: Parent: Ceratolithus
References:
Blair, S. A., Bergen, J. A., de Kaenel, E., Browning, E. & Boesiger, T. M. (2017). Upper Miocene-Lower Pliocene taxonomy and stratigraphy in the circum North Atlantic Basin: radiation and extinction of Amauroliths, Ceratoliths and the D. quinqueramus lineage. Journal of Nannoplankton Research. 37(2-3): 113-144. gs V O
Gartner, S. & Bukry, D. (1974). Ceratolithus acutus Gartner and Bukry n. sp. and Ceratolithus amplificus Bukry and Percival - nomenclatural clarification. Tulane Studies in Geology and Paleontology. 11: 115-118. gs V O
Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O
Perch-Nielsen, K. (1977a). Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39: 699-823. gs V O
Popescu, S-M., Melinte-Dobrinescu, M. C., Suc, J-P. & Do Couto, D. (2017). Ceratolithus acutus Gartner and Bukry 1974 (= C. armatus Müller 1974), calcareous nannofossil marker of the marine reflooding that terminated the Messinian salinity crisis: Comment on “Paratethyan ostracods in the Spanish Lago-Mare: More evidence for interbasinal exchange at high Mediterranean sea level” by Stoica et al., 2016. Palaeogeography Palaeoclimatology Palaeoecology. 485: 986-989. gs
Raffi, I., Backman, J. & Rio, D. (1998). Evolutionary trends of tropical calcareous nannofossils in the late Neogene. Marine Micropaleontology. 35(1): 17-41. gs
Theodoridis, S. (1984). Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32: 1-271. gs V O
Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 225-265. gs V O
