Axopodorhabdus albianus

Podorhabdus albianus Black, 1967

Zygolithus biramiculatus Stover, 1966 — Invalid under ICN Art. 35.1; originally published in association with the invalid genus Zygolithus (ICN Arts. 36.1, 38.1, 40.1).

Axopodorhabdus biramiculatus (Stover, 1966) Corbett & Watkins, 2014 — Invalid under ICN Art. 35.1.

Prediscosphaera ? orbiculofenestra Gartner, 1968.

Podorhabdus fusiformis Black, 1972a.

Podorhabdus gracilis Black, 1972a.

Axopodorhabdus albianus (Black, 1967) Wind & Wise in Wise & Wind, 1977 — Invalid combination under ICN Art. 41.5; the original publication was not cited.

Placolith elliptical to subcircular. Distal shield composed of non-imbricated segments; median and proximal shields well developed, forming a tripartite shield structure. Central area spanned by an axial cross supported by a tube cycle and bearing a hollow distal process. Arms of the axial cross composed of longitudinal segments arranged in two opposing halves, widening near the tube cycle.

The distal shield is in constant extinction because the optic axis (c-axis) is perpendicular to the microscope stage, whereas the proximal shield and the tube cycle exhibit interference colours with inclined extinction.

Axopodorhabdus albianus differs from other species of Axopodorhabdus in possessing three superposed (tiered) shields, a feature not observed in other representatives of the genus.

Black, M. 1967. New names for some coccolith taxa. - Proceedings of the Geological Society of London 1640: 139-145.

Black, M. 1972a. British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48.

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

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

Wind, F. H. & Wise, S. W. 1983. Correlation of upper Campanian-lower Maastrichtian calcareous nannofossil assemblages in drill and piston cores from the Falkland Plateau, southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 551-563.