Alphacyathus

Alphacyathus R. BEDFORD& J. BEDFORD, 1939

Specimen-type: Dictyocyathus annularis lectotype, R. BEDFORD& W. R. BEDFORD, 1936, fig. 55

Systematics:
Order: PUTAPACYATHIDA Vologdin, 1961
Superfamily: PUTAPACYATHOIDEA R. Bedford& J. Bedford, 1936
Family: ALPHACYATHIDAE R. Bedford& J. Bedford, 1939

Note:
Be careful, longitudinal plates look like septa.

Alphacyathus Alphacyathus simplex (TAYLOR) paralectotype NHM S4822 Botoman, Ajax Mine, Australia Longitudinal view (by M. DEBRENNE).

Alphacyathus Alphacyathus simplex (TAYLOR) lectotype SAM T1598 Botoman, Ajax Mine, Australia Longitudinal section (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002)

Alphacyathus Alphacyathus simplex (TAYLOR) paralectotype USNM PU86714, specimen 225 Botoman, Ajax Mine, Australia Transverse 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) : 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) : None
• 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) : No vertical intervallar element
• Relationship between rows of carcass pores and tabulae (IW) : Stirrup pores ; One row of pores between two successive tabulae
• Building of carcass perforations (IW) : Without participation of vertical structures
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Type of morphological tubes (IW) : None
• Additional sheath : None

Intervallum

• Vertical intervallar structures : None
  (Be careful, longitudinal plates look like septa.)
• Link between vertical intervallar structures : Plates
  (Be careful, longitudinal plates look like septa.)
• Type of plates : Longitudinal
  (Be careful, longitudinal plates look like septa.)
• Intervallar cells : None
• Tabulae : Present
• Building of tabulae : Independent from walls
• Porosity of tabulae : Simple pores

Others informations

• Cup shapes : Cylindrical-conical
• Shape of cup bulges : None
• Number of walls : 2
• Habitus : Solitary
• Central Cavity (or internal if one wall) : Empty
• Thorny corolla : None
• Chambers : None
• Other aquiferous unit : None
• Stratigraphical extension : Botoman
• Botoman : 3
• Geographical repartition : Australia

Systematic

• Orders : Putapacyathida
• Superfamillies inside the Putapacyathida : Putapacyathoidea
• Famillies inside the Putapacyathida : Alphacyathidae

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
• 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) : None (external plates and/or inner wall)
• 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
• 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) : None
• Carcass perforations: inner wall (IW) : Pores
• Building of carcass perforations (IW) : Without participation of vertical structures
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : None
  (Be careful, longitudinal plates look like septa.)
• Link between vertical intervallar structures : Plates
  (Be careful, longitudinal plates look like septa.)
• Type of plates : Longitudinal
  (Be careful, longitudinal plates look like septa.)
• Intervallar cells : None
• Tabulae : Present
• Porosity of tabulae : Simple pores
• 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
• 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) : None
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• Carcass perforations: inner wall (IW) : Pores
• Relationship between rows of carcass pores and tabulae (IW) : Stirrup pores ; One row of pores between two successive tabulae
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Type of morphological tubes (IW) : None
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : None
  (Be careful, longitudinal plates look like septa.)
• Link between vertical intervallar structures : Plates
  (Be careful, longitudinal plates look like septa.)
• Type of plates : Longitudinal
  (Be careful, longitudinal plates look like septa.)
• Intervallar cells : None
• Tabulae : 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
• 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) : None
• Stipules : None
• Type of morphological tubes (OW/SW) : None
• Carcass perforations: inner wall (IW) : Pores
• Relationship between rows of carcass pores and intersept (IW) : No vertical intervallar element
• Relationship between rows of carcass pores and tabulae (IW) : Stirrup pores ; One row of pores between two successive tabulae
• Building of carcass perforations (IW) : Without participation of vertical structures
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Type of morphological tubes (IW) : None
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : None
  (Be careful, longitudinal plates look like septa.)
• Link between vertical intervallar structures : Plates
  (Be careful, longitudinal plates look like septa.)
• Type of plates : Longitudinal
  (Be careful, longitudinal plates look like septa.)
• Intervallar cells : None
• Tabulae : Present
• Building of tabulae : Independent from walls
• Porosity of tabulae : Simple pores
• 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
• Porosity of tabulae : Simple pores