Fragilicyathus
Fragilicyathus BELYAEVA, 1969
Specimen-type: Fragilicyathus zhuravlevae holotype, BELYAEVA, 1969, pl. 37, fig. 7
Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: SYRINGOCNEMINA Okulitch, 19>
Superfamily: FRAGILICYATHOIDEA Belyaeva, 1975
Family:FRAGILICYATHIDAE Belyaeva, 1975
Fragilicyathus
Outer wall
- Shape of carcass perforations openings (OW/SW) : ?
- Direction of carcass canals tubes (OW/SW) : Horizontal to upwardly opening
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Origin of carcass canals (OW/SW) : Limited to the carcass
- Type of carcass perforations: outer wall or single wall (OW/SW) : Canals
- Presence of carcass bumps: outer wall or single wall (OW/SW) : None
- Presence of stipules (OW/SW) : None
- Shape of morphological tubes (OW/SW) : None
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Shape of carcass canals tubes (OW/SW) : Straight
- Type of additional sheath (OW/SW) : None
- Rows number of carcass perforations per intersept (OW/SW) : More than 2 rows per intersept only
- Subdivision of carcass perforations openings (OW/SW) : Without subdivision
Inner wall
- Shape of carcass perforations openings (IW) : Simple
- Rows number of carcass pores per intertabula (IW) : No tabula
- Type of carcass perforations: inner wall (IW) : Pores
- Building of carcass perforations (IW) : Without participation of vertical structures
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Shape of morphological tubes (IW) : None
- Shape of carcass external plates (IW) : S-shaped only
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Type of carcass external plates (IW) : Poretubes
- Direction of carcass external plates (IW) : Upwardly projecting
- Type of additional sheath (IW) : None
- Presence of stipules (IW) : None
- Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
- Rims of carcass external plates (IW) : Smooth
- Subdivision of carcass perforations openings (IW) : Without subdivision
Intervallum
- Presence of intervallar cells : Present
- Type of links between intervallar structures : Synapticulae
- Presence of vertical intervallar structures : None
- Presence of tabulae : none
- Section shape of intervallar cells : Hexagonal
- Repartition of synapticulae : Tangential at intervallar cells
- Type of Intervallar cells : Syringe
- Number of pores rows per facet (intervallar cells) : Several rows of pores on each facet
Others informations
- Number of walls : 2
- Stratigraphical extension : Botoman
- Geographical repartition : Russia
- Shape of cup bulges : None
- Presence of chambers : None
- Type of habitus : Solitary ; Modular
- Structure of central Cavity (or internal if one wall) : Empty
- Presence of thorny corolla : None
- Russia : Far East
- Botoman : 1
- Type of modularity : Branching by longitudinal subdivisions
- Cup shapes : Cylindrical-conical
- Type of other aquiferous unit : None
Systematic
- Orders : Archaeocyathida
- Superfamillies inside the Syringocnemina : Fragilicyathoidea
- Suborders inside the Archaeocyathida : Syringocnemina
- Shape of carcass perforations openings (OW/SW) : ?
- Cup shapes : Cylindrical-conical
- Famillies inside the Syringocnemina : Fragilicyathidae
External view
- Cup shapes : Cylindrical-conical
- Shape of cup bulges : None
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Type of modularity : Branching by longitudinal subdivisions
- Type of habitus : Solitary ; Modular
- Presence of carcass bumps: outer wall or single wall (OW/SW) : None
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Shape of carcass external plates (IW) : S-shaped only
- Direction of carcass external plates (IW) : Upwardly projecting
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Presence of thorny corolla : None
- Type of carcass external plates (IW) : Poretubes
- Type of additional sheath (OW/SW) : None
- Type of additional sheath (IW) : None
- Shape of carcass perforations openings (OW/SW) : ?
- Rims of carcass external plates (IW) : Smooth
- Presence of chambers : None
- Type of other aquiferous unit : None
- Subdivision of carcass perforations openings (OW/SW) : Without subdivision
- Number of walls : 2
Transverse section
- Shape of cup bulges : None
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Number of walls : 2
- Type of habitus : Solitary ; Modular
- Type of carcass perforations: outer wall or single wall (OW/SW) : Canals
- Presence of carcass bumps: outer wall or single wall (OW/SW) : None
- Building of carcass perforations (IW) : Without participation of vertical structures
- Type of carcass perforations: inner wall (IW) : Pores
- Structure of central Cavity (or internal if one wall) : Empty
- Presence of vertical intervallar structures : None
- Presence of thorny corolla : None
- Repartition of synapticulae : Tangential at intervallar cells
- Type of links between intervallar structures : Synapticulae
- Presence of intervallar cells : Present
- Presence of tabulae : none
- Type of other aquiferous unit : None
- Type of Intervallar cells : Syringe
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Rows number of carcass perforations per intersept (OW/SW) : More than 2 rows per intersept only
- Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
- Rims of carcass external plates (IW) : Smooth
- Section shape of intervallar cells : Hexagonal
Longitudinal section
- Shape of cup bulges : None
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Number of walls : 2
- Type of modularity : Branching by longitudinal subdivisions
- Type of habitus : Solitary ; Modular
- Direction of carcass canals tubes (OW/SW) : Horizontal to upwardly opening
- Origin of carcass canals (OW/SW) : Limited to the carcass
- Type of carcass perforations: outer wall or single wall (OW/SW) : Canals
- Presence of carcass bumps: outer wall or single wall (OW/SW) : None
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Cup shapes : Cylindrical-conical
- Type of carcass perforations: inner wall (IW) : Pores
- Structure of central Cavity (or internal if one wall) : Empty
- Shape of carcass external plates (IW) : S-shaped only
- Direction of carcass external plates (IW) : Upwardly projecting
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Shape of morphological tubes (IW) : None
- Presence of vertical intervallar structures : None
- Presence of thorny corolla : None
- Repartition of synapticulae : Tangential at intervallar cells
- Type of links between intervallar structures : Synapticulae
- Presence of intervallar cells : Present
- Presence of tabulae : none
- Type of other aquiferous unit : None
- Type of Intervallar cells : Syringe
- Presence of chambers : None
- Shape of carcass canals tubes (OW/SW) : Straight
- Type of additional sheath (OW/SW) : None
- Type of additional sheath (IW) : None
- Presence of stipules (IW) : None
- Rims of carcass external plates (IW) : Smooth
- Shape of morphological tubes (OW/SW) : None
- Rows number of carcass pores per intertabula (IW) : No tabula
- Section shape of intervallar cells : Hexagonal
Oblique section
- Shape of cup bulges : None
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Number of walls : 2
- Type of habitus : Solitary ; Modular
- Direction of carcass canals tubes (OW/SW) : Horizontal to upwardly opening
- Origin of carcass canals (OW/SW) : Limited to the carcass
- Type of carcass perforations: outer wall or single wall (OW/SW) : Canals
- Presence of carcass bumps: outer wall or single wall (OW/SW) : None
- Presence of stipules (OW/SW) : None
- Shape of morphological tubes (OW/SW) : None
- Rows number of carcass pores per intertabula (IW) : No tabula
- Cup shapes : Cylindrical-conical
- Building of carcass perforations (IW) : Without participation of vertical structures
- Type of carcass perforations: inner wall (IW) : Pores
- Structure of central Cavity (or internal if one wall) : Empty
- Shape of morphological tubes (IW) : None
- Presence of vertical intervallar structures : None
- Presence of thorny corolla : None
- Repartition of synapticulae : Tangential at intervallar cells
- Presence of intervallar cells : Present
- Presence of tabulae : none
- Presence of chambers : None
- Type of other aquiferous unit : None
- Type of Intervallar cells : Syringe
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Shape of carcass canals tubes (OW/SW) : Straight
- Type of additional sheath (OW/SW) : None
- Type of additional sheath (IW) : None
- Presence of stipules (IW) : None
- Rows number of carcass perforations per intersept (OW/SW) : More than 2 rows per intersept only
- Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
- Rims of carcass external plates (IW) : Smooth
- Shape of carcass perforations openings (IW) : Simple
- Type of carcass external plates (IW) : Poretubes
- Shape of carcass external plates (IW) : S-shaped only
- Direction of carcass external plates (IW) : Upwardly projecting
- Type of links between intervallar structures : Synapticulae
- Section shape of intervallar cells : Hexagonal
- Shape of carcass perforations openings (OW/SW) : ?
- Subdivision of carcass perforations openings (OW/SW) : Without subdivision
- Subdivision of carcass perforations openings (IW) : Without subdivision
- Number of pores rows per facet (intervallar cells) : Several rows of pores on each facet
Tangential section
- Shape of carcass perforations openings (OW/SW) : ?
- Shape of carcass perforations openings (IW) : Simple
- Presence of thorny corolla : None
- Section shape of intervallar cells : Hexagonal
- Subdivision of carcass perforations openings (OW/SW) : Without subdivision
- Subdivision of carcass perforations openings (IW) : Without subdivision
- Number of pores rows per facet (intervallar cells) : Several rows of pores on each facet