Kechikacyathus

Kechikacyathus DEBRENNE& A. ZHURAVLEV, 1992a

Specimen-type: Kechikacyathus natlaensis holotype, DEBRENNE& A. ZHURAVLEV, 1992a, pl. 1, fig. 3

Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: DICTYOFAVINA Debrenne, 1991
Superfamily: USLONCYATHOIDEA Fonin, 1966
Family: USLONCYATHIDAE Fonin, 1966

Kechikacyathus Kechikacyathus natlaensis DEBRENNE & A. ZHURAVLEV holotype GSC 90166 Botoman, Natla, Mackenzie Mountains, Canada Longitudinal section (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002)

Kechikacyathus Kechikacyathus natlaensis DEBRENNE & A. ZHURAVLEV specimen GSC 103939, GAM-78-G, Botoman, Kechika River, British Columbia, Canada Detail of outer wall in tangential section (DEBRENNE & A. ZHURAVLEV, 1992a).

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) : Irregular
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Irregular repartition
• Relationship between rows of carcass pores and intersept (OW/SW) : more than 2
• 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 not well defined
• Stipules : None
• Carcass perforations: inner wall (IW) : Pores
• Type of carcass pores (IW) : Irregular
• 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) : None (external plates and/or inner wall)
• Type of morphological tubes (IW) : None
• Additional sheath : None

Intervallum

• Vertical intervallar structures : None
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : ?
• Intervallar cells : Present
• Type of Intervallar cells : Calicles
• Section of intervallar cells : Hexagonal
• Porosity of intervallar cells : One row of pores per facet
• Repartition of intervallar cells pores : Same numbers of rows of pores per facet
• 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 interparietal budding ; Branching by external budding ; Branching by longitudinal subdivisions ; Massive pseudocolony
• Central Cavity (or internal if one wall) : Empty
• Thorny corolla : None
• Chambers : None
• Other aquiferous unit : None
• Stratigraphical extension : Botoman
• Botoman : 1 ; 2
• Geographical repartition : Canada

Systematic

• Orders : Archaeocyathida
• Suborders inside the Archaeocyathida : Dictyofavina
• Superfamillies inside the Dictyofavina : Usloncyathoidea
• Famillies inside the Dictyofavina : Usloncyathidae

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 not well defined
• Habitus : Solitary ; Modular
• Type of modularity : Branching by interparietal budding ; Branching by external budding ; Branching by longitudinal subdivisions ; Massive pseudocolony
• 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 not 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) : more than 2
• 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
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : ?
• Intervallar cells : Present
• Type of Intervallar cells : Calicles
• 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 not well defined
• Habitus : Solitary ; Modular
• Type of modularity : Branching by interparietal budding ; Branching by external budding ; Branching by longitudinal subdivisions ; Massive pseudocolony
• 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) : No tabula
• 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
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : ?
• Intervallar cells : Present
• Type of Intervallar cells : Calicles
• 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 not 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) : more than 2
• 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) : 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) : None (external plates and/or inner wall)
• Type of morphological tubes (IW) : None
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : None
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : ?
• Intervallar cells : Present
• Type of Intervallar cells : Calicles
• Tabulae : none
• Chambers : None
• Other aquiferous unit : None

Tangential section

• Type of carcass pores (OW/SW) : Irregular
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Irregular repartition
• Type of carcass pores (IW) : Irregular
• Thorny corolla : None
• Section of intervallar cells : Hexagonal
• Porosity of intervallar cells : One row of pores per facet
• Repartition of intervallar cells pores : Same numbers of rows of pores per facet