Porocoscinus

Porocoscinus DEBRENNE, 1964

Specimen-type: Porocoscinus flexibilis holotype, DEBRENNE, 1964, pl. 28, fig. 1-3

Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: ERISMACOSCININA Debrenne, Rozanov& A. Zhuravlev, 1989
Superfamily: POROCOSCINOIDEA Debrenne, 1964
Family: POROCOSCINIDAE Debrenne, 1964

Porocoscinus Porocoscinus flexibilis DEBRENNE holotype MNHN M84108, specimen S Sc 5-4b Botoman, Serra Scoris, Sardinia, Italy Transverse section (outer wall at top) (DEBRENNE, A. ZHURAVLEV & KRUSE, 2002)

Porocoscinus Porocoscinus flexibilis DEBRENNE holotype MNHN M84108, specimen S Sc 5-4b Botoman, Serra Scoris, Sardinia, Italy longitudinal section (outer wall to right) (DEBRENNE, 1964)

Porocoscinus Porocoscinus flexibilis DEBRENNE specimen MT6 D2-9, MNHN, PARIS Botoman, Matoppa, Sardinia, Italy longitudinal section (outer wall to right) (by M. DEBRENNE)

Outer wall

• Structure of outer carcass wall (OW/SW) : Carcass wall well defined
• Carcass perforations: outer wall or single wall (OW/SW) : Canals
• Shape of carcass canals (OW/SW) : S-shaped
• Direction of carcass canals (OW/SW) : Upwardly opening ; Horizontal opening
  (horizontal to upwardly opening)
• Origin of carcass canals (OW/SW) : Limited to the carcass
• Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
• 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) : ?
• Direction of carcass external plates (OW/SW) : Downwardly projecting
• Stipules : Present on outer carcass wall ; Present on inner carcass wall
• Type of morphological tubes (OW/SW) : Inverted-V shaped ; S-shaped
• Additional sheath : None

Inner wall

• Structure of inner carcass wall (IW) : Carcass wall well defined
• Stipules : Present on outer carcass wall ; Present on inner carcass wall
• Carcass perforations: inner wall (IW) : Canals
• Constitution of carcass canal system (IW) : 1 zone
• Shape of carcass canals zone A (IW) : Inverted V-shaped
• Porosity of carcass canals zone A (IW) : Non-porous
• Relationship between carcass canals zone A and intersept (IW) : Several rows of canals per intersept
• Direction of carcass canals zone A (IW) : Upwardly opening ; Downwardly opening
• 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) : Inverted-V shaped
• Additional sheath : None

Intervallum

• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• 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 ; 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 : Botoman
• Botoman : 1 ; 2 ; 3
• Geographical repartition : Antarctica ; Australia ; China ; Europe
  (China: South China.)
• Europe : Iberia ; Italia: Sardinia

Systematic

• Orders : Ajacicyathida
• Suborders inside the Ajacicyathida : Erismacoscinina
• Superfamillies inside the Erismacoscinina : Porocoscinoidea
• Famillies inside the Erismacoscinina : Porocoscinidae

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
• 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) : ?
• Direction of carcass external plates (OW/SW) : Downwardly projecting
• 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 ; Modular
• Central Cavity (or internal if one wall) : Empty
• Carcass perforations: outer wall or single wall (OW/SW) : Canals
• Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
• 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) : Canals
• Relationship between carcass canals zone A and intersept (IW) : Several rows of canals per intersept
• 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 : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Completely porous
• Link between vertical intervallar structures : None
• 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 ; 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) : Canals
• Shape of carcass canals (OW/SW) : S-shaped
• Direction of carcass canals (OW/SW) : Upwardly opening ; Horizontal opening
  (horizontal to upwardly opening)
• Origin of carcass canals (OW/SW) : Limited to the carcass
• Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
• 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) : ?
• Direction of carcass external plates (OW/SW) : Downwardly projecting
• Stipules : Present on outer carcass wall ; Present on inner carcass wall
• Type of morphological tubes (OW/SW) : Inverted-V shaped ; S-shaped
• Carcass perforations: inner wall (IW) : Canals
• Constitution of carcass canal system (IW) : 1 zone
• Shape of carcass canals zone A (IW) : Inverted V-shaped
• Porosity of carcass canals zone A (IW) : Non-porous
• Direction of carcass canals zone A (IW) : Upwardly opening ; Downwardly opening
• Carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Type of morphological tubes (IW) : Inverted-V shaped
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• 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 ; Modular
• Central Cavity (or internal if one wall) : Empty
• Carcass perforations: outer wall or single wall (OW/SW) : Canals
• Shape of carcass canals (OW/SW) : S-shaped
• Direction of carcass canals (OW/SW) : Upwardly opening ; Horizontal opening
  (horizontal to upwardly opening)
• Origin of carcass canals (OW/SW) : Limited to the carcass
• Relationship between carcass canals and intersept (OW/SW) : Several rows of canals per intersept
• Carcass bumps: outer wall or single wall (OW/SW) : None
• Carcass external plates: outer wall or single wall (OW/SW) : Present
• Stipules : Present on outer carcass wall ; Present on inner carcass wall
• Type of morphological tubes (OW/SW) : Inverted-V shaped ; S-shaped
• Carcass perforations: inner wall (IW) : Canals
• Constitution of carcass canal system (IW) : 1 zone
• Shape of carcass canals zone A (IW) : Inverted V-shaped
• Porosity of carcass canals zone A (IW) : Non-porous
• Relationship between carcass canals zone A and intersept (IW) : Several rows of canals per intersept
• Direction of carcass canals zone A (IW) : Upwardly opening ; Downwardly opening
• 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) : Inverted-V shaped
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• Tabulae : Present
• Building of tabulae : Independent from walls
• Porosity of tabulae : Simple pores
• Chambers : None
• Other aquiferous unit : None

Tangential section

• Thorny corolla : None
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores
• Porosity of tabulae : Simple pores