Retilamina

Retilamina DEBRENNE& JAMES, 1981

Specimen-type: Retilamina amourensis holotype, DEBRENNE& JAMES, 1981, pl. 54, fig. 4

Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: ARCHAEOCYATHINA Okulitch, 1935
Superfamily: DICTYOCYATHOIDEA Taylor, 1910
Family: DICTYOCYATHIDAE Taylor, 1910

Note:
Upper wall corresponds to outer wall and Lower wall to inner wall.

Retilamina Retilamina amourensis DEBRENNE & JAMES holotype GSC 62128, specimen 169-5acT1 Botoman, Mount St Margaret, Newfoundland, Canada Oblique section (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002).

Outer wall

• Structure of outer carcass wall (OW/SW) : Carcass wall not well defined
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass perforations: outer wall or single wall (OW/SW) : Pores
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Type of carcass pores (OW/SW) : Irregular
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Regular repartition ; Independant from the vertical intervallar structures
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Relationship between rows of carcass pores and intersept (OW/SW) : 1
• Carcass bumps: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass external plates: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Stipules : None
• Type of morphological tubes (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Additional sheath : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)

Inner wall

• Structure of inner carcass wall (IW) : Carcass wall not well defined
• Stipules : None
• Carcass perforations: inner wall (IW) : Pores
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Type of carcass pores (IW) : Irregular
• Relationship between rows of carcass pores and intersept (IW) : ?
• 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)
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Type of morphological tubes (IW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Additional sheath : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)

Intervallum

• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Taeniae ; Pseudotaeniae ; Dictyonal network
  (dictyonal or more probably pseudotaenial network)
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores ; Tetragonal pores
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : At each interpore node
• Intervallar cells : None
• Tabulae : none

Others informations

• Cup shapes : Domal
• 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 : Chimneys ; None
  (pores commonly produced as chimneys)
• Stratigraphical extension : Botoman
• Botoman : 2
• Geographical repartition : Canada ; Mexico ; USA

Systematic

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

External view

• Cup shapes : Domal
• Shape of cup bulges : None
• Structure of outer carcass wall (OW/SW) : Carcass wall not well defined
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Structure of inner carcass wall (IW) : Carcass wall not 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
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass external plates: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Additional sheath : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Thorny corolla : None

Transverse section

• Shape of cup bulges : None
• Number of walls : 2
• Structure of outer carcass wall (OW/SW) : Carcass wall not well defined
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• 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
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Relationship between rows of carcass pores and intersept (OW/SW) : 1
• Carcass bumps: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass external plates: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass perforations: inner wall (IW) : Pores
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Building of carcass perforations (IW) : Without participation of vertical structures
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Additional sheath : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Taeniae ; Pseudotaeniae ; Dictyonal network
  (dictyonal or more probably pseudotaenial network)
• Repartition of vertical intervallar structures pores : ?
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : At each interpore node
• Intervallar cells : None
• Tabulae : none
• Other aquiferous unit : Chimneys ; None
  (pores commonly produced as chimneys)

Longitudinal section

• Shape of cup bulges : None
• Number of walls : 2
• Structure of outer carcass wall (OW/SW) : Carcass wall not well defined
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Structure of inner carcass wall (IW) : Carcass wall not 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
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass bumps: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass external plates: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Stipules : None
• Type of morphological tubes (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass perforations: inner wall (IW) : Pores
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• 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)
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Type of morphological tubes (IW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Additional sheath : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Taeniae ; Pseudotaeniae ; Dictyonal network
  (dictyonal or more probably pseudotaenial network)
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores ; Tetragonal pores
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : At each interpore node
• Intervallar cells : None
• Tabulae : none
• Chambers : None
• Other aquiferous unit : Chimneys ; None
  (pores commonly produced as chimneys)

Oblique section

• Shape of cup bulges : None
• Number of walls : 2
• Structure of outer carcass wall (OW/SW) : Carcass wall not well defined
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• 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
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Size of carcass pores (OW/SW) : Uniform size
• Relationship between rows of carcass pores and intersept (OW/SW) : 1
• Carcass bumps: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass external plates: outer wall or single wall (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Stipules : None
• Type of morphological tubes (OW/SW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Carcass perforations: inner wall (IW) : Pores
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Relationship between rows of carcass pores and intersept (IW) : ?
• 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)
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Type of morphological tubes (IW) : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Additional sheath : None
  (Upper wall corresponds to outer wall and Lower wall to inner wall.)
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Taeniae ; Pseudotaeniae ; Dictyonal network
  (dictyonal or more probably pseudotaenial network)
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores ; Tetragonal pores
• Link between vertical intervallar structures : Synapticulae
• Repartition of synapticulae : At each interpore node
• Intervallar cells : None
• Tabulae : none
• Chambers : None
• Other aquiferous unit : Chimneys ; None
  (pores commonly produced as chimneys)

Tangential section

• Type of carcass pores (OW/SW) : Irregular
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Regular repartition ; Independant from the vertical intervallar structures
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Type of carcass pores (IW) : Irregular
• Thorny corolla : None
• Repartition of vertical intervallar structures pores : ?
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores ; Tetragonal pores