(Lecal 1966) Loeblich & Tappan 1968 [Syracolithus]
After Young et al. 2003. BCs - placolith like with broad smooth distal flange. Ridge-like central mass often present and can almost fill central area. BCs usually vary greatly in size on coccosphere.
CFCs - smaller than BCs and rim narrower; spine well developed (ca. 1.5 μm tall), formed of four blades (cruciform in cross section), typically with blades parallel to long axis extended to form wide flat spine.
AAC - one BC type lith with a quadrate spine often present (stem narrower than CFCs)
XCs - rim smooth, flange expanded into broad apically directed wing and long antapically directed wing.
Sub-tropical - transitional (Findlay & Giraudeau, 2000).
After Young et al. 2003. Variation: Two sub-types are present and seem to be consistently differentiable: Type 1 - BCs without axial structure, XCs with long flange extensions. (This form corresponds to the holotype of Lecal 1966). Type 2 - most BCs with axial ridge, XCs with moderate length flange extensions.