Archaeocyathan knowledge base (Cambrian)

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Mikhnocyathus

Mikhnocyathus MASLOV, 1957
Specimen-type: Mikhnocyathus zolaensis lectotype, MASLOV, 1957, fig. 2(1,4,7)

Systematics:
Order: ARCHAEOCYATHIDA Okulitch, 1935
Suborder: LOCULICYATHINA Zhuravleva, 1955
Superfamily: LOCULICYATHOIDEA Zhuravleva, 1954
Family: LOCULICYATHIDAE Zhuravleva, 1954

Notes:
Presence in Europe (Sardinia) isn't sure.
Tabular plates are sporadic.

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Outer wall

• Shape of carcass perforations openings (OW/SW) : Simple AND polygonal
• 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) : None
• Presence of stipules (OW/SW) : None
• Shape of morphological tubes (OW/SW) : None
• Structure of outer carcass wall (OW/SW) : Carcass wall well defined
• Repartition types of carcass pores (OW/SW) : Random
• 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) : More than 2 rows per intersept only
• Subdivision of carcass perforations openings (IW) : Without subdivision

Intervallum

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

Others informations

• Number of walls : 2
• Stratigraphical extension : Atdabanian
• Geographical repartition : Europe ; 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 ; Full
• Presence of thorny corolla : None
• Europe : Italia: Sardinia
• Russia : Altay Sayan ; Transbaikal ; Tuva
• Atdabanian : 2 ; 3
• Type of modularity : Branching by interparietal budding
• Cup shapes : Cylindrical-conical
• Type of other aquiferous unit : None

Systematic

• Orders : Archaeocyathida
• Superfamillies inside the Loculicyathina : Loculicyathoidea
• Suborders inside the Archaeocyathida : Loculicyathina
• Shape of carcass perforations openings (OW/SW) : Simple AND polygonal
• Cup shapes : Cylindrical-conical
• Famillies inside the Loculicyathina : Loculicyathidae

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
• Presence of carcass bumps: outer wall or single wall (OW/SW) : 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)
• 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) : Random
• Shape of carcass perforations openings (OW/SW) : Simple AND polygonal
• 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
• Presence of carcass bumps: outer wall or single wall (OW/SW) : None
• 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 ; Full
• Type of vertical intervallar structures : Pseudosepta
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Type of plates : Tabular
• Type of links between intervallar structures : None ; Plates
• 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) : More than 2 rows per intersept only
• 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
• Presence of carcass bumps: outer wall or single wall (OW/SW) : None
• 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 ; Full
• 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 : Coarsely porous
• Pores shape of vertical intervallar structures : Circular pores
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Type of plates : Tabular
• Type of links between intervallar structures : None ; Plates
• 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
• Presence of carcass bumps: outer wall or single wall (OW/SW) : None
• 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 ; Full
• 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 : Coarsely 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) : More than 2 rows per intersept only
• Shape of carcass perforations openings (IW) : Simple
• Porosity of vertical intervallar structures : Multiperforate
• Type of links between intervallar structures : None ; Plates
• Type of plates : Tabular
• Shape of carcass perforations openings (OW/SW) : Simple AND polygonal
• 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 AND polygonal
• 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 : Coarsely porous
• Pores shape of vertical intervallar structures : Circular pores
• Repartition types of carcass pores (OW/SW) : Random
• 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