Flexanulus
Flexanulus DEBRENNE, 1975
Specimen-type: Flexanulus
oosthuizeni holotype, DEBRENNE, 1975, fig. 3a-b
Systematics:
Order:
AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: AJACICYATHINA
R. Bedford& J. Bedford, 1939
Superfamily: ETHMOPHYLLOIDEA
Okulitch, 1937
Family: KIJACYATHIDAE Zhuravleva, 1964
Flexanulus Flexanulus oosthuizeni DEBRENNE holotype SAM(C) K4495 B-12a Botoman, Zwartskraal, South Africa Transverse section (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002) |
Flexanulus Flexanulus oosthuizeni DEBRENNE holotype SAM(C) K4495 B-12a Botoman, Zwartskraal, South Africa Longitudinal section (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002) |
Outer wall
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Carcass perforations: outer wall or single wall (OW/SW) : Canals
- Shape of carcass canals (OW/SW) : S-shaped
-
Direction of carcass canals (OW/SW) : Upwardly opening ;
Horizontal opening
(horizontal to upwardly opening) - Origin of carcass canals (OW/SW) : Within the intervallum
- Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
- Carcass bumps: outer wall or single wall (OW/SW) : None
- Carcass external plates: outer wall or single wall (OW/SW) : Present
- Type of carcass external plates (OW/SW) : Bracts
- Shape of carcass external plates (OW/SW) : Arcuate
- Direction of carcass external plates (OW/SW) : Downwardly projecting
- Stipules : Present on outer carcass wall
- Type of morphological tubes (OW/SW) : Inverted-V shaped ; S-shaped
- Additional sheath : None
Inner wall
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Stipules : Present on outer carcass wall
- Carcass perforations: inner wall (IW) : Pores
- Type of carcass pores (IW) : Simple
- Relationship between rows of carcass pores and intersept (IW) : 1
- Relationship between rows of carcass pores and tabulae (IW) : No tabula
- Building of carcass perforations (IW) : Without participation of vertical structures
- Carcass external plates: inner carcass wall (IW) : Present
- Type of carcass external plates (IW) : Annuli
- Relationship between carcass annuli and tabulae (IW) : No tabula
- Shape of carcass external plates (IW) : S-shaped
- Direction of carcass external plates (IW) : Upwardly projecting
- Type of morphological tubes (IW) : None
- Additional sheath : None
Intervallum
- Vertical intervallar structures : Present
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Aporous ; Sparsely porous
- Porosity of vertical intervallar structures : Finely porous
- Pores of vertical intervallar structures : Aporous ; Circular pores
- Link between vertical intervallar structures : None
- Intervallar cells : None
- Tabulae : none
Others informations
- Cup shapes : Cylindrical-conical
- Shape of cup bulges : None
- Number of walls : 2
- Habitus : Solitary ; Modular
- Type of modularity : Branching by longitudinal subdivisions ; Catenulate
- Central Cavity (or internal if one wall) : Empty
- Thorny corolla : None
- Chambers : None
- Other aquiferous unit : None
- Stratigraphical extension : Botoman
- Botoman : 3
- Geographical repartition : Antarctica ; South Africa
Systematic
- Orders : Ajacicyathida
- Suborders inside the Ajacicyathida : Ajacicyathina
- Superfamillies inside the Ajacicyathina : Ethmophylloidea
- Famillies inside the Ajacicyathina : Kijacyathidae
External view
- Cup shapes : Cylindrical-conical
- 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
- Habitus : Solitary ; Modular
- Type of modularity : Branching by longitudinal subdivisions ; Catenulate
- Carcass bumps: outer wall or single wall (OW/SW) : None
- Carcass external plates: outer wall or single wall (OW/SW) : Present
- Type of carcass external plates (OW/SW) : Bracts
- Shape of carcass external plates (OW/SW) : Arcuate
- Direction of carcass external plates (OW/SW) : Downwardly projecting
- Carcass external plates: inner carcass wall (IW) : Present
- Type of carcass external plates (IW) : Annuli
- Relationship between carcass annuli and tabulae (IW) : No tabula
- Shape of carcass external plates (IW) : S-shaped
- Direction of carcass external plates (IW) : Upwardly projecting
- Additional sheath : None
- Thorny corolla : None
Transverse section
- Shape of cup bulges : None
- Number of walls : 2
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Habitus : Solitary ; Modular
- Central Cavity (or internal if one wall) : Empty
- Carcass perforations: outer wall or single wall (OW/SW) : Canals
- Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
- Carcass bumps: outer wall or single wall (OW/SW) : None
- Carcass external plates: outer wall or single wall (OW/SW) : Present
- Carcass perforations: inner wall (IW) : Pores
- Building of carcass perforations (IW) : Without participation of vertical structures
- Carcass external plates: inner carcass wall (IW) : Present
- Additional sheath : None
- Thorny corolla : None
- Vertical intervallar structures : Present
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Aporous ; Sparsely porous
- Link between vertical intervallar structures : None
- Intervallar cells : None
- Tabulae : none
- Other aquiferous unit : None
Longitudinal section
- Shape of cup bulges : None
- Number of walls : 2
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Habitus : Solitary ; Modular
- Type of modularity : Branching by longitudinal subdivisions ; Catenulate
- Central Cavity (or internal if one wall) : Empty
- Carcass perforations: outer wall or single wall (OW/SW) : Canals
- Shape of carcass canals (OW/SW) : S-shaped
-
Direction of carcass canals (OW/SW) : Upwardly opening ;
Horizontal opening
(horizontal to upwardly opening) - Origin of carcass canals (OW/SW) : Within the intervallum
- Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
- Carcass bumps: outer wall or single wall (OW/SW) : None
- Carcass external plates: outer wall or single wall (OW/SW) : Present
- Type of carcass external plates (OW/SW) : Bracts
- Shape of carcass external plates (OW/SW) : Arcuate
- Direction of carcass external plates (OW/SW) : Downwardly projecting
- Stipules : Present on outer carcass wall
- Type of morphological tubes (OW/SW) : Inverted-V shaped ; S-shaped
- Carcass perforations: inner wall (IW) : Pores
- Relationship between rows of carcass pores and tabulae (IW) : No tabula
- Carcass external plates: inner carcass wall (IW) : Present
- Type of carcass external plates (IW) : Annuli
- Relationship between carcass annuli and tabulae (IW) : No tabula
- Shape of carcass external plates (IW) : S-shaped
- Direction of carcass external plates (IW) : Upwardly projecting
- Type of morphological tubes (IW) : None
- Additional sheath : None
- Thorny corolla : None
- Vertical intervallar structures : Present
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Aporous ; Sparsely porous
- Porosity of vertical intervallar structures : Finely porous
- Pores of vertical intervallar structures : Aporous ; Circular pores
- Link between vertical intervallar structures : None
- Intervallar cells : None
- Tabulae : none
- Chambers : None
- Other aquiferous unit : None
Oblique section
- Shape of cup bulges : None
- Number of walls : 2
- Structure of outer carcass wall (OW/SW) : Carcass wall well defined
- Structure of inner carcass wall (IW) : Carcass wall well defined
- Habitus : Solitary ; Modular
- Central Cavity (or internal if one wall) : Empty
- Carcass perforations: outer wall or single wall (OW/SW) : Canals
- Shape of carcass canals (OW/SW) : S-shaped
-
Direction of carcass canals (OW/SW) : Upwardly opening ;
Horizontal opening
(horizontal to upwardly opening) - Origin of carcass canals (OW/SW) : Within the intervallum
- Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
- Carcass bumps: outer wall or single wall (OW/SW) : None
- Carcass external plates: outer wall or single wall (OW/SW) : Present
- Stipules : Present on outer carcass wall
- Type of morphological tubes (OW/SW) : Inverted-V shaped ; S-shaped
- Carcass perforations: inner wall (IW) : Pores
- Relationship between rows of carcass pores and intersept (IW) : 1
- Relationship between rows of carcass pores and tabulae (IW) : No tabula
- Building of carcass perforations (IW) : Without participation of vertical structures
- Carcass external plates: inner carcass wall (IW) : Present
- Type of morphological tubes (IW) : None
- Additional sheath : None
- Thorny corolla : None
- Vertical intervallar structures : Present
- Type of vertical intervallar structures : Septa
- Repartition of vertical intervallar structures pores : Aporous ; Sparsely porous
- Porosity of vertical intervallar structures : Finely porous
- Pores of vertical intervallar structures : Aporous ; Circular pores
- Link between vertical intervallar structures : None
- Intervallar cells : None
- Tabulae : none
- Chambers : None
- Other aquiferous unit : None
Tangential section
- Type of carcass pores (IW) : Simple
- Thorny corolla : None
- Repartition of vertical intervallar structures pores : Aporous ; Sparsely porous
- Porosity of vertical intervallar structures : Finely porous
- Pores of vertical intervallar structures : Aporous ; Circular pores