Rectannulus

Rectannulus DEBRENNE, 1977a

Specimen-type: Rectannulus willefertae holotype, DEBRENNE, 1977a, pl. 6, fig. 2-3

Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: AJACICYATHINA R. Bedford& J. Bedford, 1939
Superfamily: BRONCHOCYATHOIDEA R. Bedford& J. Bedford, 1936
Family: DENSOCYATHIDAE Vologdin, 1937

Note:
Scales may be fused into pseudo annuli.

Rectannulus Rectannulus willefertae DEBRENNE holotype MNHN, Paris M80026 specimen IRH4-2b Botoman, Jbel Irhoud, Morocco Oblique longitudinal section (by M. DEBRENNE).

Rectannulus Rectannulus willefertae DEBRENNE holotype MNHN M80026 specimen IRH4-2b Botoman, Jbel Irhoud, Morocco 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) : Stirrup pores
• Relationship between rows of carcass pores and tabulae (IW) : No tabula
• Building of carcass perforations (IW) : ?
• Carcass external plates: inner carcass wall (IW) : Present
• Type of carcass external plates (IW) : Scales ; Annuli
  (Scales may be fused into pseudo annuli.)
• Relationship between carcass annuli and tabulae (IW) : No tabula
• Shape of carcass external plates (IW) : Arcuate ; Waved ; Fused
• Direction of carcass external plates (IW) : Upwardly projecting ; Horizontally projecting
  (horizontal to upwardly projecting scales)
• Type of morphological tubes (IW) : None
• Additional sheath : None

Intervallum

• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• 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 longitudinal subdivisions ; Catenulate
• Central Cavity (or internal if one wall) : Empty
• Thorny corolla : None
• Chambers : None
• Other aquiferous unit : None
• Stratigraphical extension : Atdabanian ; Botoman
• Atdabanian : 4
• Botoman : 1
• Geographical repartition : Morocco

Systematic

• Orders : Ajacicyathida
• Suborders inside the Ajacicyathida : Ajacicyathina
• Superfamillies inside the Ajacicyathina : Bronchocyathoidea
• Famillies inside the Ajacicyathina : Densocyathidae

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
• 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) : Scales ; Annuli
  (Scales may be fused into pseudo annuli.)
• Relationship between carcass annuli and tabulae (IW) : No tabula
• Shape of carcass external plates (IW) : Arcuate ; Waved ; Fused
• Direction of carcass external plates (IW) : Upwardly projecting ; Horizontally projecting
  (horizontal to upwardly projecting scales)
• 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) : ?
• 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) : ?
• Carcass external plates: inner carcass wall (IW) : Present
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Link between vertical intervallar structures : None
• Intervallar cells : None
• 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 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) : 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) : Present
• Type of carcass external plates (IW) : Scales ; Annuli
  (Scales may be fused into pseudo annuli.)
• Relationship between carcass annuli and tabulae (IW) : No tabula
• Shape of carcass external plates (IW) : Arcuate ; Waved ; Fused
• Direction of carcass external plates (IW) : Upwardly projecting ; Horizontally projecting
  (horizontal to upwardly projecting scales)
• Type of morphological tubes (IW) : None
• Additional sheath : None
• Thorny corolla : None
• Vertical intervallar structures : Present
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• 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 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) : ?
• 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) : Stirrup pores
• Relationship between rows of carcass pores and tabulae (IW) : No tabula
• Building of carcass perforations (IW) : ?
• 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 : Septa
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores
• Link between vertical intervallar structures : None
• Intervallar cells : None
• Tabulae : none
• 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
• Repartition of vertical intervallar structures pores : Sparsely porous ; Completely porous
• Porosity of vertical intervallar structures : Finely porous
• Pores of vertical intervallar structures : Circular pores