Archaeocyathan knowledge base (Cambrian)

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Sakhacyathus

Sakhacyathus DEBRENNE& A. ZHURAVLEV, 1990

Specimen-type: Paranacyathus subartus holotype, ZHURAVLEVA, 1960b, pl. 28, fig. 6

Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: LOCULICYATHINA Zhuravleva, 1955
Superfamily: SAKHACYATHOIDEA Debrenne& A. Zhuravlev, 1990
Family: SAKHACYATHIDAE Debrenne& A. Zhuravlev, 1990

Note:
Two rows of pores per intersept is sporadic on the inner carcass wall.

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Outer wall

• Shape of carcass perforations openings (OW/SW) : Simple only
• Number of perforation on carcass bumps (OW/SW) : Simple
• Presence of carcass external plates: outer wall or single wall (OW/SW) : None
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Homogeneous repartition
• Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
• Presence of carcass bumps: outer wall or single wall (OW/SW) : Present
• Presence of stipules (OW/SW) : None
• Shape of morphological tubes (OW/SW) : None
• Structure of outer carcass wall (OW/SW) : Carcass wall well defined
• Direction of carcass bumps perforation (OW/SW) : Central opening
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Type of additional sheath (OW/SW) : None
• Rows number of carcass perforations per intersept (OW/SW) : 2 AND more than 2 rows per intersept
• Subdivision of carcass perforations openings (OW/SW) : Without subdivision

Inner wall

• Shape of carcass perforations openings (IW) : Simple
• Rows number of carcass pores per intertabula (IW) : No tabula
• Type of carcass perforations: inner wall (IW) : Pores
• Building of carcass perforations (IW) : Without participation of vertical structures
• Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Shape of morphological tubes (IW) : None
• Structure of inner carcass wall (IW) : Carcass wall well defined
• Type of additional sheath (IW) : None
• Presence of stipules (IW) : None
• Rows number of carcass perforations per intersept (IW) : 1 row per intersept only ; 1 AND 2 rows per intersept
• Subdivision of carcass perforations openings (IW) : Without subdivision

Intervallum

• Presence of intervallar cells : None
• Type of links between intervallar structures : None
• Presence of vertical intervallar structures : Present
• Presence of tabulae : none
• Type of vertical intervallar structures : Pseudosepta
• Repartition of vertical intervallar structures pores : Sparsely porous
• Porosity type of vertical intervallar structures : Finely porous
• Pores shape of vertical intervallar structures : Circular pores

Others informations

• Number of walls : 2
• Stratigraphical extension : Tommotian ; Atdabanian
• Geographical repartition : Mongolia ; Russia
• Shape of cup bulges : None
• Presence of chambers : None
• Type of habitus : Solitary ; Modular
• Structure of central Cavity (or internal if one wall) : Empty
• Presence of thorny corolla : None
• Russia : Altay Sayan ; Siberian Platform ; Transbaikal ; Tuva
• Atdabanian : 1 ; 2
• Tommotian : 2 ; 3 ; 4
• Type of modularity : Branching by interparietal budding
• Cup shapes : Cylindrical-conical
• Type of other aquiferous unit : None

Systematic

• Orders : Archaeocyathida
• Superfamillies inside the Loculicyathina : Sakhacyathoidea
• Suborders inside the Archaeocyathida : Loculicyathina
• Shape of carcass perforations openings (OW/SW) : Simple only
• Cup shapes : Cylindrical-conical
• Famillies inside the Loculicyathina : Sakhacyathidae

External view

• Cup shapes : Cylindrical-conical
• Shape of cup bulges : None
• Structure of outer carcass wall (OW/SW) : Carcass wall well defined
• Type of modularity : Branching by interparietal budding
• Type of habitus : Solitary ; Modular
• Size of carcass pores (OW/SW) : Uniform size
• Number of perforation on carcass bumps (OW/SW) : Simple
• Presence of carcass bumps: outer wall or single wall (OW/SW) : Present
• Direction of carcass bumps perforation (OW/SW) : Central opening
• Presence of carcass external plates: outer wall or single wall (OW/SW) : None
• Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Presence of thorny corolla : None
• Type of additional sheath (OW/SW) : None
• Type of additional sheath (IW) : None
• Repartition of carcass pores (OW/SW) : Homogeneous repartition
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Shape of carcass perforations openings (OW/SW) : Simple only
• Presence of chambers : None
• Type of other aquiferous unit : None
• Subdivision of carcass perforations openings (OW/SW) : Without subdivision
• Number of walls : 2

Transverse section

• 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
• Number of walls : 2
• Type of habitus : Solitary ; Modular
• Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
• Number of perforation on carcass bumps (OW/SW) : Simple
• Presence of carcass bumps: outer wall or single wall (OW/SW) : Present
• Building of carcass perforations (IW) : Without participation of vertical structures
• Type of carcass perforations: inner wall (IW) : Pores
• Structure of central Cavity (or internal if one wall) : Empty
• Type of vertical intervallar structures : Pseudosepta
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Type of links between intervallar structures : None
• Presence of intervallar cells : None
• Presence of tabulae : none
• Type of other aquiferous unit : None
• Presence of carcass external plates: outer wall or single wall (OW/SW) : None
• Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Rows number of carcass perforations per intersept (OW/SW) : 2 AND more than 2 rows per intersept
• Rows number of carcass perforations per intersept (IW) : 1 row per intersept only ; 1 AND 2 rows per intersept
• Porosity of vertical intervallar structures : Multiperforate

Longitudinal section

• 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
• Number of walls : 2
• Type of modularity : Branching by interparietal budding
• Type of habitus : Solitary ; Modular
• Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
• Number of perforation on carcass bumps (OW/SW) : Simple
• Presence of carcass bumps: outer wall or single wall (OW/SW) : Present
• Direction of carcass bumps perforation (OW/SW) : Central opening
• Presence of carcass external plates: outer wall or single wall (OW/SW) : None
• Cup shapes : Cylindrical-conical
• Type of carcass perforations: inner wall (IW) : Pores
• Structure of central Cavity (or internal if one wall) : Empty
• Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Shape of morphological tubes (IW) : None
• Type of vertical intervallar structures : Pseudosepta
• Repartition of vertical intervallar structures pores : Sparsely porous
• Porosity type of vertical intervallar structures : Finely porous
• Pores shape of vertical intervallar structures : Circular pores
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Type of links between intervallar structures : None
• Presence of intervallar cells : None
• Presence of tabulae : none
• Type of other aquiferous unit : None
• Presence of chambers : None
• Type of additional sheath (OW/SW) : None
• Type of additional sheath (IW) : None
• Presence of stipules (IW) : None
• Shape of morphological tubes (OW/SW) : None
• Rows number of carcass pores per intertabula (IW) : No tabula
• Porosity of vertical intervallar structures : Multiperforate

Oblique section

• 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
• Number of walls : 2
• Type of habitus : Solitary ; Modular
• Size of carcass pores (OW/SW) : Uniform size
• Type of carcass perforations: outer wall or single wall (OW/SW) : Pores
• Number of perforation on carcass bumps (OW/SW) : Simple
• Presence of carcass bumps: outer wall or single wall (OW/SW) : Present
• Presence of stipules (OW/SW) : None
• Shape of morphological tubes (OW/SW) : None
• Rows number of carcass pores per intertabula (IW) : No tabula
• Cup shapes : Cylindrical-conical
• Building of carcass perforations (IW) : Without participation of vertical structures
• Type of carcass perforations: inner wall (IW) : Pores
• Structure of central Cavity (or internal if one wall) : Empty
• Shape of morphological tubes (IW) : None
• Type of vertical intervallar structures : Pseudosepta
• Repartition of vertical intervallar structures pores : Sparsely porous
• Porosity type of vertical intervallar structures : Finely porous
• Pores shape of vertical intervallar structures : Circular pores
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Presence of intervallar cells : None
• Presence of tabulae : none
• Presence of chambers : None
• Type of other aquiferous unit : None
• Presence of carcass external plates: outer wall or single wall (OW/SW) : None
• Presence of carcass external plates: inner carcass wall (IW) : None (external plates and/or inner wall)
• Type of additional sheath (OW/SW) : None
• Type of additional sheath (IW) : None
• Presence of stipules (IW) : None
• Rows number of carcass perforations per intersept (OW/SW) : 2 AND more than 2 rows per intersept
• Rows number of carcass perforations per intersept (IW) : 1 row per intersept only ; 1 AND 2 rows per intersept
• Direction of carcass bumps perforation (OW/SW) : Central opening
• Shape of carcass perforations openings (IW) : Simple
• Porosity of vertical intervallar structures : Multiperforate
• Type of links between intervallar structures : None
• Shape of carcass perforations openings (OW/SW) : Simple only
• Subdivision of carcass perforations openings (OW/SW) : Without subdivision
• Subdivision of carcass perforations openings (IW) : Without subdivision

Tangential section

• Shape of carcass perforations openings (OW/SW) : Simple only
• Size of carcass pores (OW/SW) : Uniform size
• Repartition of carcass pores (OW/SW) : Homogeneous repartition
• Shape of carcass perforations openings (IW) : Simple
• Presence of thorny corolla : None
• Repartition of vertical intervallar structures pores : Sparsely porous
• Porosity type of vertical intervallar structures : Finely porous
• Pores shape of vertical intervallar structures : Circular pores
• Repartition types of carcass pores (OW/SW) : Straight rows of pores
• Subdivision of carcass perforations openings (OW/SW) : Without subdivision
• Subdivision of carcass perforations openings (IW) : Without subdivision

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Base mise à jour le 11 mars 2014 | Page générée avec Xper2 le 11 mars 2014