Changicyathus
Changicyathus DEBRENNE& A. ZHURAVLEV, 1990
Specimen-type: Cambrocyathellus tenuicaulus holotype, ZHANG& YUAN, 1985, pl. 2, fig. 6
Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: ARCHAEOCYATHINA Okulitch, 1935
Superfamily: METACYATHOIDEA R. Bedford& W. R. Bedford, 1934
Family: METACYATHIDAE R. Bedford& W. R. Bedford, 1934
Note:
Presence in Tajikistan isn't sure.
Changicyathus
Outer wall
- Shape of carcass perforations openings (OW/SW) : Simple only
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Size of carcass pores (OW/SW) : Uniform size
- Repartition of carcass pores (OW/SW) : Homogeneous repartition
- Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
- 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
- Repartition types of carcass pores (OW/SW) : Straight rows of pores
- Type of additional sheath (OW/SW) : None
- Rows number of carcass perforations per intersept (OW/SW) : 2 AND more than 2 rows per intersept
- Subdivision of carcass perforations openings (OW/SW) : Completely subdivided pores
Inner wall
- Shape of carcass perforations openings (IW) : Simple
- Rows number of carcass pores per intertabula (IW) : Several rows of pores between two successive tabulae only
- 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) : None (external plates and/or inner wall)
- Shape of morphological tubes (IW) : None
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Type of additional sheath (IW) : None
- Presence of stipules (IW) : None
- Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
- Subdivision of carcass perforations openings (IW) : Incipient pore subdivision
Intervallum
- Presence of intervallar cells : None
- Type of links between intervallar structures : None
- Presence of vertical intervallar structures : Present
- Presence of tabulae : Present
- Type of vertical intervallar structures : Taeniae
- Pores shape of tabulae : Subdivided pores
- Repartition of vertical intervallar structures pores : ?
- Porosity type of vertical intervallar structures : Coarsely porous
- Pores shape of vertical intervallar structures : Circular pores
- Building of tabulae : Extensions of both walls
Others informations
- Number of walls : 2
- Stratigraphical extension : Atdabanian ; Botoman
- Geographical repartition : China ; Tajikistan
- 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
- Botoman : 1
- Atdabanian : 4
- Type of modularity : Branching by external budding ; Branching by longitudinal subdivisions
- Cup shapes : Cylindrical-conical
- Type of other aquiferous unit : None
Systematic
- Orders : Archaeocyathida
- Superfamillies inside the Archaeocyathina : Metacyathoidea
- Suborders inside the Archaeocyathida : Archaeocyathina
- Shape of carcass perforations openings (OW/SW) : Simple only
- Cup shapes : Cylindrical-conical
- Famillies inside the Archaeocyathina : Metacyathidae
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 external budding ; Branching by longitudinal subdivisions
- Type of habitus : Solitary ; Modular
- Size of carcass pores (OW/SW) : Uniform size
- 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
- Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
- Presence of thorny corolla : None
- Type of additional sheath (OW/SW) : None
- Type of additional sheath (IW) : None
- Repartition of carcass pores (OW/SW) : Homogeneous repartition
- Repartition types of carcass pores (OW/SW) : Straight rows of pores
- Shape of carcass perforations openings (OW/SW) : Simple only
- Presence of chambers : None
- Type of other aquiferous unit : None
- Subdivision of carcass perforations openings (OW/SW) : Completely subdivided pores
- 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) : Pores
- 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
- Type of vertical intervallar structures : Taeniae
- Presence of vertical intervallar structures : Present
- Presence of thorny corolla : None
- Type of links between intervallar structures : None
- Presence of intervallar cells : None
- Pores shape of tabulae : Subdivided pores
- Presence of tabulae : Present
- Type of other aquiferous unit : None
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
- Rows number of carcass perforations per intersept (OW/SW) : 2 AND more than 2 rows per intersept
- Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
- Porosity of vertical intervallar structures : Multiperforate
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 external budding ; Branching by longitudinal subdivisions
- Type of habitus : Solitary ; Modular
- Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
- 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
- Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
- Shape of morphological tubes (IW) : None
- Type of vertical intervallar structures : Taeniae
- Repartition of vertical intervallar structures pores : ?
- Porosity type of vertical intervallar structures : Coarsely porous
- Pores shape of vertical intervallar structures : Circular pores
- Presence of vertical intervallar structures : Present
- Presence of thorny corolla : None
- Type of links between intervallar structures : None
- Presence of intervallar cells : None
- Building of tabulae : Extensions of both walls
- Presence of tabulae : Present
- Type of other aquiferous unit : None
- Presence of chambers : None
- Type of additional sheath (OW/SW) : None
- Type of additional sheath (IW) : None
- Presence of stipules (IW) : None
- Shape of morphological tubes (OW/SW) : None
- Rows number of carcass pores per intertabula (IW) : Several rows of pores between two successive tabulae only
- Porosity of vertical intervallar structures : Multiperforate
- Organization of tabulae inside the cup : Regular
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
- Size of carcass pores (OW/SW) : Uniform size
- Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
- 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) : Several rows of pores between two successive tabulae only
- 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
- Type of vertical intervallar structures : Taeniae
- Repartition of vertical intervallar structures pores : ?
- Porosity type of vertical intervallar structures : Coarsely porous
- Pores shape of vertical intervallar structures : Circular pores
- Presence of vertical intervallar structures : Present
- Presence of thorny corolla : None
- Presence of intervallar cells : None
- Building of tabulae : Extensions of both walls
- Pores shape of tabulae : Subdivided pores
- Presence of tabulae : Present
- Presence of chambers : None
- Type of other aquiferous unit : None
- Presence of carcass external plates: outer wall or single wall (OW/SW) : None
- Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
- 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) : 2 AND more than 2 rows per intersept
- Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
- Shape of carcass perforations openings (IW) : Simple
- Porosity of vertical intervallar structures : Multiperforate
- Type of links between intervallar structures : None
- Organization of tabulae inside the cup : Regular
- Shape of carcass perforations openings (OW/SW) : Simple only
- Subdivision of carcass perforations openings (OW/SW) : Completely subdivided pores
- Subdivision of carcass perforations openings (IW) : Incipient pore subdivision
Tangential section
- Shape of carcass perforations openings (OW/SW) : Simple only
- Size of carcass pores (OW/SW) : Uniform size
- Repartition of carcass pores (OW/SW) : Homogeneous repartition
- Shape of carcass perforations openings (IW) : Simple
- Presence of thorny corolla : None
- Repartition of vertical intervallar structures pores : ?
- Porosity type of vertical intervallar structures : Coarsely porous
- Pores shape of vertical intervallar structures : Circular pores
- Pores shape of tabulae : Subdivided pores
- Repartition types of carcass pores (OW/SW) : Straight rows of pores
- Subdivision of carcass perforations openings (OW/SW) : Completely subdivided pores
- Subdivision of carcass perforations openings (IW) : Incipient pore subdivision