Catalog entries: Theocampe bassilis
Original description: Shell of three segments, thin, hyaline; cephalis and thorax together conical; abdomen long, subcylindrical. Both thorax and abdomen elliptical in transverse section with largest dimension in sagittal plane. Cephalis bears a horizontal tube and in most specimens a tiny apical horn; pores sparse, small, circular. Internally, weak paired ridges extend from apical spine to sides of vertical spine. A dorsal branch from the apical spine, just below the apex, extends to the cephalic wall. There are six collar pores and an additional pair of pores ventrally to them on the lower wall of the tube. Axial spines, possibly five in number, are very variable in size, some extend into the abdomen (longest 70µ). Thorax with minute nodes and rarely ridges over all; circular pores widely spaced, those above lumbar stricture forming a transverse row. Lumbar stricture well-defined, externally by a change in contour and internally by a distinct shelf. Abdomen with subcircular to subquadrangular pores, generally with prongs on their margin, in up to ten, perhaps more, transverse rows; the first immediately below the lumbar stricture. Rows approximately evenly spaced, except distally where the shell thins, constricts slightly, and rows are more closely spaced. Distal margin smooth.
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"
Plot of occurrence data:
Siphocampe bassilis compiled by the radiolaria@mikrotax project team viewed: 29-11-2023
Short stables page link: https://mikrotax.org/radiolaria/index.php?id=205382 Go to Archive.is to create a permanent copy of this page - citation notes