Subtilocyathus

Subtilocyathus VOLOGDIN, 1960

Specimen-type: Archaeocyathus subtilis VOLOGDIN, 1932, p. 41 text-fig. 32a-b, pl.5 fig 2-3, pl.7 fig. 7, pl.8 fig.5b

Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: DOKIDOCYATHINA Vologdin, 1957
Superfamily: SOANICYATHOIDEA Rozanov, 1964
Family: SOANICYATHIDAE Rozanov, 1964

Subtilocyathus Subtilocyathus subtilis (VOLOGDIN) Lectotype TsNIGRm 50a/2957 Botoman, Lebed’ River, Altay Sayan, Russia Transverse section (VOLOGDIN, 1932)

Subtilocyathus Subtilocyathus subtilis (VOLOGDIN) lectotype TsNIGRm 50a/2957 Botoman, Lebed’ River, Altay Sayan, Russia Detail of transverse section (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) : Simple
• 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) : Present
• Type of carcass external plates (OW/SW) : Bracts
• Shape of carcass external plates (OW/SW) : Arcuate
• Direction of carcass external plates (OW/SW) : Upwardly projecting
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• Additional sheath : None

Inner wall

• Structure of inner carcass wall (IW) : Carcass wall well defined
• Stipules : None
• 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) : Bracts
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Shape of carcass external plates (IW) : Arcuate
• Direction of carcass external plates (IW) : Upwardly projecting
• Type of morphological tubes (IW) : None
• Additional sheath : None

Intervallum

• Vertical intervallar structures : Present ; None
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : One row of pores per vertical structure
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : 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 : Atdabanian ; Botoman
• Atdabanian : 2 ; 3 ; 4
• Botoman : 1
• Geographical repartition : Mongolia ; Russia
• Russia : Altay Sayan ; Tuva

Systematic

• Orders : Ajacicyathida
• Suborders inside the Ajacicyathida : Dokidocyathina
• Superfamillies inside the Dokidocyathina : Soanicyathoidea
• Famillies inside the Dokidocyathina : Soanicyathidae

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) : Present
• Type of carcass external plates (OW/SW) : Bracts
• Shape of carcass external plates (OW/SW) : Arcuate
• Direction of carcass external plates (OW/SW) : Upwardly projecting
• Carcass external plates: inner carcass wall (IW) : Present
• Type of carcass external plates (IW) : Bracts
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Shape of carcass external plates (IW) : Arcuate
• 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) : 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) : 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 ; None
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : One row of pores per vertical structure
• 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) : Pores
• 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) : Upwardly projecting
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• 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) : Bracts
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Shape of carcass external plates (IW) : Arcuate
• Direction of carcass external plates (IW) : Upwardly projecting
• Type of morphological tubes (IW) : None
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : Present ; None
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : One row of pores per vertical structure
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : 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) : 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) : Present
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• 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 ; None
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : One row of pores per vertical structure
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : 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 (OW/SW) : Simple
• 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 carcass pores (IW) : Simple
• Thorny corolla : None
• Repartition of vertical intervallar structures pores : One row of pores per vertical structure
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : Circular pores