Yhecyathus

Yhecyathus BELYAEVA& YUAN, 1995

Specimen-type: Yhecyathus futchinensis holotype, BELYAEVA& YUAN, 1995, fig. 1d

Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: ERISMACOSCININA Debrenne, Rozanov& A. Zhuravlev, 1989
Superfamily: SALAIROCYATHOIDEA Zhuravleva, 1956
Family: RUDANULIDAE Debrenne, Rozanov& A. Zhuravlev, 1989

Yhecyathus Yhecyathus futchinensis BELYAEVA & YUAN holotype NIGP NF6H1 Botoman, Fuchin, Shaanxi, China Oblique longitudinal section (BELYAEVA & YUAN, 1995).

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) : More than 2
• 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
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Shape of carcass external plates (IW) : Arcuate
• 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 : 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 : Both walls show folds
• Type of folds affecting both walls : Transverse folds
• Shape of folds affecting both walls : Shallow and distant
• Number of walls : 2
• Habitus : Solitary
• Central Cavity (or internal if one wall) : Empty
• Thorny corolla : None
• Chambers : None
• Other aquiferous unit : None
• Stratigraphical extension : Botoman
• Botoman : 3
• Geographical repartition : China
  (China: South China.)

Systematic

• Orders : Ajacicyathida
• Suborders inside the Ajacicyathida : Erismacoscinina
• Superfamillies inside the Erismacoscinina : Salairocyathoidea
• Famillies inside the Erismacoscinina : Rudanulidae

External view

• Cup shapes : Cylindrical-conical
• Shape of cup bulges : Both walls show folds
• Type of folds affecting both walls : Transverse folds
• Shape of folds affecting both walls : Shallow and distant
• Structure of outer carcass wall (OW/SW) : Carcass wall well defined
• Structure of inner carcass wall (IW) : Carcass wall well defined
• Habitus : Solitary
• 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
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Shape of carcass external plates (IW) : Arcuate
• Direction of carcass external plates (IW) : Upwardly projecting
• Additional sheath : None
• Thorny corolla : None

Transverse section

• Shape of cup bulges : Both walls show folds
• Type of folds affecting both walls : Transverse folds
• Shape of folds affecting both walls : Shallow and distant
• 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
• 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) : 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 : 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 : Both walls show folds
• Type of folds affecting both walls : Transverse folds
• Shape of folds affecting both walls : Shallow and distant
• 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
• 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
• Localisation of carcass bracts (IW) : Bract arises on inner wall
• Shape of carcass external plates (IW) : Arcuate
• 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 : 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 : Both walls show folds
• Type of folds affecting both walls : Transverse folds
• Shape of folds affecting both walls : Shallow and distant
• 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
• 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) : More than 2
• 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 : 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

• 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 : Completely porous
• Porosity of vertical intervallar structures : ?
• Pores of vertical intervallar structures : Circular pores
• Porosity of tabulae : Simple pores