Ladaecyathus
Ladaecyathus ZHURAVLEVA, 1960a
Specimen-type: Tegerocyathus limbatus holotype, ZHURAVLEVA, 1955a, pl. 5, fig. 3-4
Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: AJACICYATHINA R. Bedford& J. Bedford, 1939
Superfamily: ERBOCYATHOIDEA Vologdin& Zhuravleva, 1956
Family: ERBOCYATHIDAE Vologdin& Zhuravleva, 1956
Ladaecyathus
Ladaecyathus
Outer wall
- Type of microporous sheath (OW/SW) : Attached
- 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
- Repartition of bracts on additional sheath (OW/SW) : No bract on additional sheath
- 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) : Microporous sheath
- 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) : Simple
- Rows number of carcass pores per intertabula (IW) : Several rows of pores between two successive tabulae only ; 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) : 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) : More than 2 rows per intersept only
- 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 : Completely 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 : Atdabanian ; Botoman
- Geographical repartition : Antarctica ; Australia ; Morocco ; 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 : Altay Sayan ; Far East ; Kolyma ; Siberian Platform ; Transbaikal
- Botoman : 1 ; 2 ; 3
- Atdabanian : 4
- 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 : Erbocyathoidea
- Famillies inside the Ajacicyathina : Erbocyathidae
- 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
- Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
- Repartition of bracts on additional sheath (OW/SW) : No bract on additional sheath
- Presence of thorny corolla : None
- Type of additional sheath (OW/SW) : Microporous sheath
- 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) : 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) : 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 : 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) : 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) : More than 2 rows 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 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
- 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
- Repartition of bracts on additional sheath (OW/SW) : No bract on additional sheath
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Completely 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) : Microporous sheath
- 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 ; No tabula
- Porosity of vertical intervallar structures : Multiperforate
- Organization of tabulae inside the cup : Random
- Type of microporous sheath (OW/SW) : Attached
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 ; 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
- Type of microporous sheath (OW/SW) : Attached
- Repartition of bracts on additional sheath (OW/SW) : No bract on additional sheath
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Completely 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) : None (external plates and/or inner wall)
- Type of additional sheath (OW/SW) : Microporous sheath
- 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) : More than 2 rows 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 : Random
- 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
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
- Type of microporous sheath (OW/SW) : Attached
- Repartition of bracts on additional sheath (OW/SW) : No bract on additional sheath
- Presence of thorny corolla : None
- Repartition of vertical intervallar structures pores : Completely 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