Stevocyathus

Stevocyathus DEBRENNE, 1989

Specimen-type: Stevocyathus elictus holotype, DEBRENNE, GANDIN& ROWLAND, 1989, pl. 12, fig. 1

Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: ARCHAEOCYATHINA Okulitch, 1935
Superfamily: DICTYOCYATHOIDEA Taylor, 1910
Family: CLARUSCOSCINIDAE Debrenne& A. Zhuravlev, 1992

Stevocyathus Stevocyathus elictus DEBRENNE holotype MNHN M83100, specimen CR2-8 Botoman, Caborca, Sonora, Mexico Oblique longitudinal section (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002)

Stevocyathus Stevocyathus elictus DEBRENNE paratype MNHN M83107, specimen CR2*1-8 Botoman, Caborca, Sonora, Mexico 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) : 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) : 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 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) : ?
• 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 ; Scales ; Annuli
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Relationship between carcass annuli and tabulae (IW) : ?
• Shape of carcass external plates (IW) : S-shaped ; Fused
• 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 : Taeniae
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : Random
• Intervallar cells : None
• Tabulae : Present ; none
  (simple segmented tabulae may be present)
• Building of tabulae : ?
• Porosity of tabulae : Simple pores

Others informations

• Cup shapes : Cylindrical-conical
• Shape of cup bulges : None
• Number of walls : 2
• Habitus : Solitary ; Modular
• Type of modularity : Branching by external budding ; Branching by longitudinal subdivisions
• Central Cavity (or internal if one wall) : Empty
• Thorny corolla : None
• Chambers : None
• Other aquiferous unit : None
• Stratigraphical extension : Botoman
• Botoman : 2
• Geographical repartition : Mexico ; USA

Systematic

• Orders : Archaeocyathida
• Suborders inside the Archaeocyathida : Archaeocyathina
• Superfamillies inside the Archaeocyathina : Dictyocyathoidea
• Famillies inside the Archaeocyathina : Claruscoscinidae

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 external budding ; Branching by longitudinal subdivisions
• 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) : Bracts ; Scales ; Annuli
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Relationship between carcass annuli and tabulae (IW) : ?
• Shape of carcass external plates (IW) : S-shaped ; Fused
• 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) : 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) : Present
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Taeniae
• Repartition of vertical intervallar structures pores : ?
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : Random
• Intervallar cells : None
• Tabulae : Present ; none
  (simple segmented tabulae may be 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 ; Modular
• Type of modularity : Branching by external budding ; Branching by longitudinal subdivisions
• 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) : ?
• Carcass external plates: inner carcass wall (IW) : Present
• Type of carcass external plates (IW) : Bracts ; Scales ; Annuli
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Relationship between carcass annuli and tabulae (IW) : ?
• Shape of carcass external plates (IW) : S-shaped ; Fused
• 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 : Taeniae
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : Random
• Intervallar cells : None
• Tabulae : Present ; none
  (simple segmented tabulae may be present)
• Building of tabulae : ?
• 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) : 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) : ?
• 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 : Taeniae
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : Random
• Intervallar cells : None
• Tabulae : Present ; none
  (simple segmented tabulae may be present)
• Building of tabulae : ?
• Porosity of tabulae : Simple pores
• 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) : Simple
• Thorny corolla : None
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : Coarsely porous
• Pores of vertical intervallar structures : Circular pores
• Porosity of tabulae : Simple pores