Tercyathus

Tercyathus VOLOGDIN in SIMON, 1939

Specimen-type: Tercyathus duplex lectotype, VOLOGDIN, 1932, pl. 13, fig. 2

Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: AJACICYATHINA R. Bedford& J. Bedford, 1939
Superfamily: TERCYATHOIDEA Vologdin, 1939
Family: TERCYATHIDAE Vologdin, 1939

Tercyathus Tercyathus duplex VOLOGDIN unlocated topotype Botoman, Lebed’ River, Altay Sayan, Russia Transverse section (REPINA & others, 1964).

Tercyathus Tercyathus duplex VOLOGDIN unlocated topotype Botoman, Lebed’ River, Altay Sayan, Russia Longitudinal section (REPINA & others, 1964).

Tercyathus Tercyathus duplex VOLOGDIN lectotype TsNIGRm 71a-g/2957 Botoman, Lebed’ River, Altay Sayan, Russia Longitudinal section of inner wall (central cavity to right) (VOLOGDIN, 1932)

Outer wall

• Structure of outer carcass wall (OW/SW) : Carcass wall well defined
• Carcass perforations: outer wall or single wall (OW/SW) : Pores
• Type of carcass pores (OW/SW) : Slitlike
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Regular repartition
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Relationship between rows of carcass pores and intersept (OW/SW) : ?
• Carcass bumps: outer wall or single wall (OW/SW) : None
• Carcass external plates: outer wall or single wall (OW/SW) : None
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• Additional sheath : None ; Present on inner wall ; Present on outer wall (or single wall)
  (microporous sheath may be present on inner wall)
• Type of additional sheath (OW/SW) : Mesh
• Type of mesh (OW/SW) : Clathri

Inner wall

• Structure of inner carcass wall (IW) : Carcass wall well defined
• Stipules : None
• Carcass perforations: inner wall (IW) : Canals
• Constitution of carcass canal system (IW) : ?
• Building of carcass canals (IW) : Non-branching
• Shape of carcass canals zone A (IW) : Straight ; Waved
  (straight to waved canals)
• Porosity of carcass canals zone A (IW) : Spongiose
• Relationship between carcass canals zone A and intersept (IW) : 1 row of canals per intersept
• Direction of carcass canals zone A (IW) : Upwardly opening ; Lateral opening ; Horizontal opening
  (horizontal to upwardly and laterally opening)
• Shape of carcass canals zone B (IW) : Straight ; Waved
  (straight to waved canals)
• Direction of carcass canals zone B (IW) : Upwardly opening ; Lateral opening ; Horizontal opening
  (horizontal to upwardly and laterally opening)
• Porosity of carcass canals zone B (IW) : Spongiose
• Building of carcass perforations (IW) : Without participation of vertical structures
• Carcass external plates: inner carcass wall (IW) : Present
• Type of carcass external plates (IW) : Spines ; Annuli
  (spines and/or annular structures)
• Relationship between carcass annuli and tabulae (IW) : Annuli between each tabulae
• Shape of carcass external plates (IW) : ?
• Direction of carcass external plates (IW) : ?
• Type of morphological tubes (IW) : None
• Additional sheath : None ; Present on inner wall ; Present on outer wall (or single wall)
  (microporous sheath may be present on inner wall)
• Type of additional sheath (IW) : Microporous sheath
  (microporous sheath may be present on inner wall)
• Type of microporous sheath (IW) : ?
• Repartition of bracts on secondary sheath (IW) : No bract on additional sheath
• Repartition of micropores (IW) : Regular

Intervallum

• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• Tabulae : Present ; none
  (pectinate tabulae may be present)
• Building of tabulae : Independent from walls
• Porosity of tabulae : Pecten
  (pectinate tabulae may be present)

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 ; Reduce
• Thorny corolla : None
• Chambers : None
• Other aquiferous unit : None
• Stratigraphical extension : Botoman ; Toyonian
• Botoman : 1 ; 2 ; 3
• Toyonian : 1
• Geographical repartition : Russia
• Russia : Altay Sayan

Systematic

• Orders : Ajacicyathida
• Suborders inside the Ajacicyathida : Ajacicyathina
• Superfamillies inside the Ajacicyathina : Tercyathoidea
• Famillies inside the Ajacicyathina : Tercyathidae

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
• Size of carcass pores (OW/SW) : Uniform size
• Carcass bumps: outer wall or single wall (OW/SW) : None
• Carcass external plates: outer wall or single wall (OW/SW) : None
• Carcass external plates: inner carcass wall (IW) : Present
• Type of carcass external plates (IW) : Spines ; Annuli
  (spines and/or annular structures)
• Relationship between carcass annuli and tabulae (IW) : Annuli between each tabulae
• Shape of carcass external plates (IW) : ?
• Direction of carcass external plates (IW) : ?
• Additional sheath : None ; Present on inner wall ; Present on outer wall (or single wall)
  (microporous sheath may be present on inner wall)
• Type of additional sheath (IW) : Microporous sheath
  (microporous sheath may be present on inner wall)
• Repartition of bracts on secondary sheath (IW) : No bract on additional sheath
• Repartition of micropores (IW) : Regular
• Type of additional sheath (OW/SW) : Mesh
• Type of mesh (OW/SW) : Clathri
• 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 ; Reduce
• Carcass perforations: outer wall or single wall (OW/SW) : Pores
• Relationship between rows of carcass pores and intersept (OW/SW) : ?
• Carcass bumps: outer wall or single wall (OW/SW) : None
• Carcass external plates: outer wall or single wall (OW/SW) : None
• Carcass perforations: inner wall (IW) : Canals
• Building of carcass canals (IW) : Non-branching
• Relationship between carcass canals zone A and intersept (IW) : 1 row of canals per intersept
• Porosity of carcass canals zone B (IW) : Spongiose
• Building of carcass perforations (IW) : Without participation of vertical structures
• Carcass external plates: inner carcass wall (IW) : Present
• Additional sheath : None ; Present on inner wall ; Present on outer wall (or single wall)
  (microporous sheath may be present on inner wall)
• Type of additional sheath (IW) : Microporous sheath
  (microporous sheath may be present on inner wall)
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Link between vertical intervallar structures : None
• Intervallar cells : None
• Tabulae : Present ; none
  (pectinate tabulae may be present)
• Porosity of tabulae : Pecten
  (pectinate tabulae may be present)
• 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 ; Reduce
• Carcass perforations: outer wall or single wall (OW/SW) : Pores
• Carcass bumps: outer wall or single wall (OW/SW) : None
• Carcass external plates: outer wall or single wall (OW/SW) : None
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• Carcass perforations: inner wall (IW) : Canals
• Constitution of carcass canal system (IW) : ?
• Building of carcass canals (IW) : Non-branching
• Shape of carcass canals zone A (IW) : Straight ; Waved
  (straight to waved canals)
• Porosity of carcass canals zone A (IW) : Spongiose
• Direction of carcass canals zone A (IW) : Upwardly opening ; Lateral opening ; Horizontal opening
  (horizontal to upwardly and laterally opening)
• Shape of carcass canals zone B (IW) : Straight ; Waved
  (straight to waved canals)
• Direction of carcass canals zone B (IW) : Upwardly opening ; Lateral opening ; Horizontal opening
  (horizontal to upwardly and laterally opening)
• Porosity of carcass canals zone B (IW) : Spongiose
• Carcass external plates: inner carcass wall (IW) : Present
• Type of carcass external plates (IW) : Spines ; Annuli
  (spines and/or annular structures)
• Relationship between carcass annuli and tabulae (IW) : Annuli between each tabulae
• Shape of carcass external plates (IW) : ?
• Direction of carcass external plates (IW) : ?
• Type of morphological tubes (IW) : None
• Additional sheath : None ; Present on inner wall ; Present on outer wall (or single wall)
  (microporous sheath may be present on inner wall)
• Type of additional sheath (IW) : Microporous sheath
  (microporous sheath may be present on inner wall)
• Repartition of bracts on secondary sheath (IW) : No bract on additional sheath
• Type of additional sheath (OW/SW) : Mesh
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• Tabulae : Present ; none
  (pectinate tabulae may be present)
• Building of tabulae : Independent from walls
• 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 ; Reduce
• Carcass perforations: outer wall or single wall (OW/SW) : Pores
• Size of carcass pores (OW/SW) : Uniform size
• Relationship between rows of carcass pores and intersept (OW/SW) : ?
• Carcass bumps: outer wall or single wall (OW/SW) : None
• Carcass external plates: outer wall or single wall (OW/SW) : None
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• Carcass perforations: inner wall (IW) : Canals
• Constitution of carcass canal system (IW) : ?
• Building of carcass canals (IW) : Non-branching
• Shape of carcass canals zone A (IW) : Straight ; Waved
  (straight to waved canals)
• Porosity of carcass canals zone A (IW) : Spongiose
• Relationship between carcass canals zone A and intersept (IW) : 1 row of canals per intersept
• Direction of carcass canals zone A (IW) : Upwardly opening ; Lateral opening ; Horizontal opening
  (horizontal to upwardly and laterally opening)
• Shape of carcass canals zone B (IW) : Straight ; Waved
  (straight to waved canals)
• Direction of carcass canals zone B (IW) : Upwardly opening ; Lateral opening ; Horizontal opening
  (horizontal to upwardly and laterally opening)
• Porosity of carcass canals zone B (IW) : Spongiose
• 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 ; Present on inner wall ; Present on outer wall (or single wall)
  (microporous sheath may be present on inner wall)
• Type of additional sheath (IW) : Microporous sheath
  (microporous sheath may be present on inner wall)
• Type of microporous sheath (IW) : ?
• Repartition of bracts on secondary sheath (IW) : No bract on additional sheath
• Type of additional sheath (OW/SW) : Mesh
• Type of mesh (OW/SW) : Clathri
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• Tabulae : Present ; none
  (pectinate tabulae may be present)
• Building of tabulae : Independent from walls
• Porosity of tabulae : Pecten
  (pectinate tabulae may be present)
• Chambers : None
• Other aquiferous unit : None

Tangential section

• Type of carcass pores (OW/SW) : Slitlike
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Regular repartition
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Type of microporous sheath (IW) : ?
• Repartition of bracts on secondary sheath (IW) : No bract on additional sheath
• Repartition of micropores (IW) : Regular
• Type of mesh (OW/SW) : Clathri
• Thorny corolla : None
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Porosity of tabulae : Pecten
  (pectinate tabulae may be present)