Distinguishing features:
Parent taxon (Grantarhabdus): Cretarhabdids with relatively narrow shields; central area wide with diagonal cross bars.
This taxon: Medium to large( 6-12 µm) cretarhabdid with diagonal cross.
Farinacci & Howe catalog pages:
C. coronadventis * , C. unicornis * , G. bukryi * , G. punctatus * , P. altus *
| LITHS: placolith, elliptical, CA: ca_disjunct, process, diagonal cross, CROSS-POLARS: rim-unicyclic, R-prominent, |
| Lith size: 6->12µm; Data source notes: original descriptions & illustrated specimens |
Geological Range:
Notes: LAD in S England in Santonian, UC12 (Burnett 1998)
Last occurrence (top): within Campanian Stage (72.17-83.65Ma, top in Campanian stage). Data source: Burnett 1998
First occurrence (base): within Aptian Stage (113.20-121.40Ma, base in Aptian stage). Data source: Bown et al. 1998
Plot of occurrence data:
Applegate, J. L. & Bergen, J. A. (1988). Cretaceous calcareous nannofossil biostratigraphy of sediments recovered from the Galicia Margin, ODP Leg 103. Proceedings of the Ocean Drilling Program, Scientific Results. 103: 293-348. gs O Black, M. (1972a). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48. gs Bown, P. R. (2001). Calcareous nannofossils of the Gault, Upper Greensand and Glauconitic Marl (Middle Albian-Lower Cenomanian) from the BGS Selborne boreholes, Hampshire. Proceedings of the Geologists' Association. 112: 223-236. gs Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O Bralower, T. J. & Siesser, W. G. (1992). Cretaceous calcareous nannofossil biostratigraphy of Sites 761, 762, and 763, Exmouth and Wombat Plateaus, northwest Australia. Proceedings of the Ocean Drilling Program, Scientific Results. 122: 529-556. gs Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs de Kaenel, E. & Bergen, J. A. (1996b). Mesozoic calcareous nannofossil biostratigraphy from sites 897, 899, and 901, Iberia Abyssal Plain: New biostratigraphic evidence. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 27-59. gs O Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs O Hattner, J. G. & Wise, S. W. (1980). Upper Cretaceous calcareous nannofossil biostratigraphy of South Carolina. South Carolina Geology. 24: 41-117. gs Mutterlose, J. (1992). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs Noël, D. (1970). Coccolithes Crétacés: La Craie Campanienne du Bassin de Paris. Éditions du Centre National de la Recherche Scientifique, Paris. -. gs Perch-Nielsen, K. (1973). Neue Coccolithen aus dem Maastrichtien von Danemark, Madagaskar und Agypten. Bulletin of the Geological Society of Denmark. 22: 306-333. gs Püttmann, T. & Mutterlose, J. (2019). Calcareous nannofossils from a Late Cretaceous nearshore setting. Journal of Nannoplankton Research. S4: 81-88. gs Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. gs Reinhardt, P. (1966). Zur Taxonomie und Biostratigraphie des fossilen Nannoplanktons aus dem Malm, der Kreide und dem Alttertiär Mitteleuropas. Freiberger Forschungshefte. C196: 5-109. gs Reinhardt, P. (1970). Synopsis der Gauttungen und Arten der mesozoischen Coccolithen und anderer kalkiger Nannofossilien. I. Freiberger Forschungshefte. C260: 5-32. gs Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs O Stover, L. E. (1966). Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology. 12(2): 133-167. gs Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs Thomsen, E. (1987). Lower Cretaceous calcareous nannofossil biostratigraphy in the Danish Central Trough. Danmarks Geologiske Undersøgelse. 20: 1-89. gs Verbeek, J. W. (1977). Calcareous nannoplankton biostratigraphy of Middle and Upper Cretaceous deposits in Tunisia, southern Spain and France. Utrecht Micropaleontological Bulletin. 16: 1-157. gs O Wise, S. W. & Wind, F. H. (1977). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 36 drilling on the Falkland Plateau, south-west Atlantic sector of the Southern Ocean. Initial Reports of the Deep Sea Drilling Project. 36(269-491): -. gs O Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs O Young, J. R. (2010). Calcareous nannofossils. In, Young, J. R., Gale, A. S., Knight, R. & Smith, A. B. (eds) Fossil of the Gault Clay. Palaeontological Association 16-27. gsReferences:

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Grantarhabdus coronadventis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-6-2026
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Comments (2)
Thank you for the information provided. According to "Fundamentals of Invertebrate Paleontology" book that is written by Dr. Sreepat Jain, we can see "offset" ultrastructure in this species. So, I recommend that editing the schematic picture and showing this element modification. If I am wrong, I would be grateful if you could provide an explanation about this ultrastructure.
Sincerely,
Nasim Lavasani
Nasim
I don't have a copy of that textbook so I can't be sure of the context of the commnt. However I suspect he is refering to the fact that in SEM the distal sutures are frequently kinked, this is a common feature of the Cretarhabdaceae (see page on the family - "In SEM the distal shield typically appears bicyclic, with a narrow outer-cycle and a dominant, broad inner-cycle, overgrown specimens show however that this is a scissor structure with both elements formed from a single crystal unit with the outer element offset clockwise from the inner element."). Sinnce it is a typical feature in the family we do not comment on it specifically for this species. I hope this helps and thank you for commenting..
Jeremy