Archaeocyathan knowledge base (Cambrian)

---

Précédent | Index | Suivant

---

Geocyathus

Geocyathus ZHURAVLEVA, 1960b

Specimen-type: Thalamocyathus botomanensis holotype, ZHURAVLEVA in ZHURAVLEVA& ZELENOV, 1955, pl. 2, fig. 3-4

Systematics:
Order: AJACICYATHIDA R. Bedford& J. Bedford, 1939
Suborder: AJACICYATHINA R. Bedford& J. Bedford, 1939
Superfamily: TUMULOCYATHOIDEA Krasnopeeva, 1953
Family: GEOCYATHIDAE Debrenne, 1964

---

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) : Downwardly 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) : Several rows of pores between two successive tabulae only ; No tabula
• Type of carcass perforations: inner wall (IW) : Pores
• Building of carcass perforations (IW) : Without participation of vertical structures
• Localization of carcass annuli according tabulae (IW) : Annuli between each tabulae only ; No tabula
• Presence of carcass external plates: inner carcass wall (IW) : Present
• Shape of morphological tubes (IW) : None
• Shape of carcass external plates (IW) : S-shaped only
• Structure of inner carcass wall (IW) : Carcass wall well defined
• Type of carcass external plates (IW) : Annuli
• Direction of carcass external plates (IW) : Upwardly projecting
• Type of additional sheath (IW) : None
• Presence of stipules (IW) : None
• Rows number of carcass perforations per intersept (IW) : 1 row per intersept only
• Shape of the interlocking of successive carcass annuli (IW) : Simple
• Rims of carcass external plates (IW) : Smooth
• 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 : Present ; none
• Type of vertical intervallar structures : Septa
• Pores shape of tabulae : Pecten
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity type of vertical intervallar structures : ?
• Pores shape of vertical intervallar structures : Circular pores
• Building of tabulae : Independent from walls

Others informations

• Number of walls : 2
• Stratigraphical extension : Atdabanian ; Botoman
• Geographical repartition : Europe ; 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
• Europe : Iberia
• Russia : Altay Sayan ; Far East ; Siberian Platform ; Transbaikal
• Botoman : 1
• Atdabanian : 1 ; 2 ; 3 ; 4
• Type of modularity : Branching by longitudinal subdivisions ; Catenulate
• Cup shapes : Cylindrical-conical
• Type of other aquiferous unit : None

Systematic

• Orders : Ajacicyathida
• Superfamillies inside the Ajacicyathina : Tumulocyathoidea
• Famillies inside the Ajacicyathina : Geocyathidae
• Shape of carcass perforations openings (OW/SW) : Simple only
• Cup shapes : Cylindrical-conical
• Suborders inside the Ajacicyathida : Ajacicyathina

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 longitudinal subdivisions ; Catenulate
• 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) : Downwardly opening
• Presence of carcass external plates: outer wall or single wall (OW/SW) : None
• Localization of carcass annuli according tabulae (IW) : Annuli between each tabulae only ; No tabula
• Shape of carcass external plates (IW) : S-shaped only
• Direction of carcass external plates (IW) : Upwardly projecting
• Presence of carcass external plates: inner carcass wall (IW) : Present
• Presence of thorny corolla : None
• Type of carcass external plates (IW) : Annuli
• 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
• Rims of carcass external plates (IW) : Smooth
• 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 : Septa
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Type of links between intervallar structures : None
• Presence of intervallar cells : None
• Pores shape of tabulae : Pecten
• Presence of tabulae : Present ; 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) : Present
• 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
• Rims of carcass external plates (IW) : Smooth
• 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 longitudinal subdivisions ; Catenulate
• 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) : Downwardly 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
• Localization of carcass annuli according tabulae (IW) : Annuli between each tabulae only ; No tabula
• Shape of carcass external plates (IW) : S-shaped only
• Direction of carcass external plates (IW) : Upwardly projecting
• Presence of carcass external plates: inner carcass wall (IW) : Present
• Shape of morphological tubes (IW) : None
• Type of vertical intervallar structures : Septa
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity type of vertical intervallar structures : ?
• 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
• Building of tabulae : Independent from walls
• Presence of tabulae : Present ; 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 the interlocking of successive carcass annuli (IW) : Simple
• Rims of carcass external plates (IW) : Smooth
• Shape of morphological tubes (OW/SW) : None
• Rows number of carcass pores per intertabula (IW) : Several rows of pores between two successive tabulae only ; No tabula
• Porosity of vertical intervallar structures : Multiperforate
• Organization of tabulae inside the cup : Random

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) : Several rows of pores between two successive tabulae only ; 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 : Septa
• Repartition of vertical intervallar structures pores : Completely porous
• Porosity type of vertical intervallar structures : ?
• Pores shape of vertical intervallar structures : Circular pores
• Presence of vertical intervallar structures : Present
• Presence of thorny corolla : None
• Presence of intervallar cells : None
• Building of tabulae : Independent from walls
• Pores shape of tabulae : Pecten
• Presence of tabulae : Present ; 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) : Present
• 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
• Shape of the interlocking of successive carcass annuli (IW) : Simple
• Rims of carcass external plates (IW) : Smooth
• Direction of carcass bumps perforation (OW/SW) : Downwardly opening
• Shape of carcass perforations openings (IW) : Simple
• Type of carcass external plates (IW) : Annuli
• Shape of carcass external plates (IW) : S-shaped only
• Direction of carcass external plates (IW) : Upwardly projecting
• Porosity of vertical intervallar structures : Multiperforate
• Type of links between intervallar structures : None
• Organization of tabulae inside the cup : Random
• 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 : Completely porous
• Porosity type of vertical intervallar structures : ?
• Pores shape of vertical intervallar structures : Circular pores
• Pores shape of tabulae : Pecten
• 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

---

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