Mackenziecyathus
Mackenziecyathus HANDFIELD, 1971
Specimen-type: Mackenziecyathus bukryi holotype, HANDFIELD, 1971, pl. 5, fig. 1a-d
Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: AJACICYATHINA R. Bedford& J. Bedford, 1939
Superfamily: BRONCHOCYATHOIDEA R. Bedford& J. Bedford, 1936
Family: ETHMOCYATHIDAE Debrenne, 1969
Mackenziecyathus
Mackenziecyathus
Mackenziecyathus
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) : Without subdivision
Inner wall
- Shape of carcass perforations openings (IW) : ?
- Shape of carcass canals tubes zone A (IW) : Straight
- Direction of carcass canals tubes zone A (IW) : Horizontal to upwardly opening
- Porosity of carcass canals tubes zone A (IW) : Non-porous
- Type of carcass perforations: inner wall (IW) : Canals
- Building of carcass perforations (IW) : With participation of vertical intervallar structures
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Shape of morphological tubes (IW) : Inverted-V shaped
- Shape of carcass external plates (IW) : Planar only ; Arcuate
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Constitution of carcass canal system (IW) : 1 zone
- Type of carcass external plates (IW) : Scales
- Direction of carcass external plates (IW) : Downwardly projecting
- Type of additional sheath (IW) : None
- Presence of stipules (IW) : None
- Rows number of carcass perforations per intersept (IW) : Stirrup perforations only
- Rims of carcass external plates (IW) : Smooth
- Subdivision of carcass perforations openings (IW) : Without subdivision
Intervallum
- Presence of intervallar cells : None
- Type of links between intervallar structures : None
- Presence of vertical intervallar structures : Present
- Presence of tabulae : Present ; none
- Type of vertical intervallar structures : Septa
- Pores shape of tabulae : Pecten
- Repartition of vertical intervallar structures pores : Sparsely porous
- Porosity type of vertical intervallar structures : Finely porous
- Pores shape of vertical intervallar structures : Circular pores
- Building of tabulae : Independent from walls
Others informations
- Number of walls : 2
- Stratigraphical extension : Botoman
- Geographical repartition : Canada ; Mongolia ; Russia ; USA
- 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 : Altay Sayan ; Far East ; Tuva
- Botoman : 1
- Type of modularity : Branching by longitudinal subdivisions ; Catenulate
- Cup shapes : Cylindrical-conical
- Type of other aquiferous unit : None
Systematic
- Orders : Ajacicyathida
- Superfamillies inside the Ajacicyathina : Bronchocyathoidea
- Famillies inside the Ajacicyathina : Ethmocyathidae
- Shape of carcass perforations openings (OW/SW) : Simple only
- Cup shapes : Cylindrical-conical
- Suborders inside the Ajacicyathida : Ajacicyathina
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 ; Catenulate
- 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
- Shape of carcass external plates (IW) : Planar only ; Arcuate
- Direction of carcass external plates (IW) : Downwardly projecting
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Presence of thorny corolla : None
- Type of carcass external plates (IW) : Scales
- 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
- 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) : Pores
- Presence of carcass bumps: outer wall or single wall (OW/SW) : None
- Building of carcass perforations (IW) : With participation of vertical intervallar structures
- Type of carcass perforations: inner wall (IW) : Canals
- Structure of central Cavity (or internal if one wall) : Empty
- Type of vertical intervallar structures : Septa
- 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 : Pecten
- Presence of tabulae : Present ; 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) : Present
- 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) : Stirrup perforations only
- Rims of carcass external plates (IW) : Smooth
- Constitution of carcass canal system (IW) : 1 zone
- Porosity of vertical intervallar structures : Aporous ; 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 longitudinal subdivisions ; Catenulate
- 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
- Constitution of carcass canal system (IW) : 1 zone
- Shape of carcass canals tubes zone A (IW) : Straight
- Porosity of carcass canals tubes zone A (IW) : Non-porous
- Direction of carcass canals tubes zone A (IW) : Horizontal to upwardly opening
- Type of carcass perforations: inner wall (IW) : Canals
- Structure of central Cavity (or internal if one wall) : Empty
- Shape of carcass external plates (IW) : Planar only ; Arcuate
- Direction of carcass external plates (IW) : Downwardly projecting
- Presence of carcass external plates: inner carcass wall (IW) : Present
- Shape of morphological tubes (IW) : Inverted-V shaped
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Sparsely porous
- Porosity type of vertical intervallar structures : Finely 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 : Independent from walls
- Presence of tabulae : Present ; none
- 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
- Rims of carcass external plates (IW) : Smooth
- Shape of morphological tubes (OW/SW) : None
- Porosity of vertical intervallar structures : Aporous ; 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
- Cup shapes : Cylindrical-conical
- Shape of carcass canals tubes zone A (IW) : Straight
- Porosity of carcass canals tubes zone A (IW) : Non-porous
- Direction of carcass canals tubes zone A (IW) : Horizontal to upwardly opening
- Building of carcass perforations (IW) : With participation of vertical intervallar structures
- Type of carcass perforations: inner wall (IW) : Canals
- Structure of central Cavity (or internal if one wall) : Empty
- Shape of morphological tubes (IW) : Inverted-V shaped
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Sparsely porous
- Porosity type of vertical intervallar structures : Finely 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 : Independent from walls
- Pores shape of tabulae : Pecten
- Presence of tabulae : Present ; none
- 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) : Present
- 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) : Stirrup perforations only
- Rims of carcass external plates (IW) : Smooth
- Shape of carcass perforations openings (IW) : ?
- Type of carcass external plates (IW) : Scales
- Shape of carcass external plates (IW) : Planar only ; Arcuate
- Direction of carcass external plates (IW) : Downwardly projecting
- Porosity of vertical intervallar structures : Aporous ; 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) : Without subdivision
- Subdivision of carcass perforations openings (IW) : Without subdivision
- Constitution of carcass canal system (IW) : 1 zone
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) : ?
- Presence of thorny corolla : None
- Repartition of vertical intervallar structures pores : Sparsely porous
- Porosity type of vertical intervallar structures : Finely porous
- Pores shape of vertical intervallar structures : Circular pores
- Pores shape of tabulae : Pecten
- Repartition types of carcass pores (OW/SW) : Straight rows of pores
- Subdivision of carcass perforations openings (OW/SW) : Without subdivision
- Subdivision of carcass perforations openings (IW) : Without subdivision
- Porosity of carcass canals tubes zone A (IW) : Non-porous