Hattneria cryptochondrus

Discolithus cryptochondrus Stover, 1966

non Rhabdolithus anthophorus Deflandre, 1959

Reinhardtites anthophorus (Deflandre, 1959) Perch-Nielsen, 1968

Species of Hattneria having a distinct central opening. The width of the pelaga [wall and distal plate lining] is about equal to the width of the central opening. The bridge appears slightly diagonal and illuminated under polarized light. The fluted structures are distinct under a light microscope.

Hattner & Wise (1980) demonstrated that the form illustrated by Bramlette & Martini (1964), Sissingh (1977) and other authors only had vestigial calyx and did not correspond to the holotype of Deflandre.

The forms conventionally known as R. anthophorus should be assigned to (Hattneria elegans Gartner, 1968) Varol, n. comb. or (Hattneria cryptochondrus Stover, 1966) Varol, n. comb.

The forms having a birefringent inner wall with large openings and massive distal process supporting well-developed calyx (with eight petal-like segments) should be assigned to Reinhardtites anthophorus. These forms currently erroneously assigned to Zeugrhabdotus presigmoides Burnett (1997).

Burnett, J. A., (1997): New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. - Journal of Nannoplankton Research. 19(2): 133-146.

Deflandre, G., (1959). Sur les nannofossiles calcaires et leur systématique. - Revue de Micropaléontologie. 2: 127-152.

Gartner, S., (1968): Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. The University of Kansas Paleontological Contributions, Article 48 (Protista 1): 1-56.

Hattner, J. G. & Wise, S. W., (1980): Upper Cretaceous calcareous nannofossil biostratigraphy of South Carolina. - South Carolina Geology. 24: 41-117.

Stover, L.E., (1966): Cretaceous coccoliths and associated nannofossils from France and the Netherlands. - Micropaleontology, 12: 133-167.