Archaeocyathan knowledge base (Cambrian)
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Group : External view
External view
List of descriptors
Cup shapes
Shape of cup bulges
Type of folds affecting both walls
Shape of folds affecting both walls
Structure of outer carcass wall (OW/SW)
Structure of inner carcass wall (IW)
Habitus
Type of modularity
Size of carcass pores (OW/SW)
Distribution of carcass pores (OW/SW)
Carcass bumps: outer wall or single wall (OW/SW)
Perforation of carcass bumps (OW/SW)
Direction of carcass bumps perforation (OW/SW)
Carcass external plates: outer wall or single wall (OW/SW)
Type of carcass external plates (OW/SW)
Shape of carcass external plates (OW/SW)
Direction of carcass external plates (OW/SW)
Carcass external plates: inner carcass wall (IW)
Type of carcass external plates (IW)
Localisation of carcass bracts (IW)
Relationship between carcass annuli and tabulae (IW)
Shape of carcass external plates (IW)
Direction of carcass external plates (IW)
Additional sheath
Type of additional sheath (IW)
Repartition of bracts on secondary sheath (IW)
Type of sieve (IW)
Repartition of micropores (IW)
Type of additional sheath (OW/SW)
Repartition of bracts on additional sheath (OW/SW)
Type of mesh (OW/SW)
Type of shieve (OW/SW)
Repartition of micropores (OW/SW)
Thorny corolla