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Role in Cambrian
Last modified : 5 December 2012
- ARCHAEOCYATHA - Glossary
Additional sheath: Second part of a wall composed by two zones (carcass + sheath).
Annulus (plur. annuli): Ring-shaped (annular) plate separating horizontal rows of pores.
Aquiferous unit: Part of the fossil corresponding to water-conducting system.
Astrorhiza: System of canals convergent on a single excurrent opening (osculum) of inner wall.
Attached: Microporous sheath attached directly to carcass pore lintels.
Bar: Radial-transverse lintel separating pores. It's biconcave in plan and with elongate cross-section.
Bract: Plate stems from lintels which incompletely covering a single pore.
Branching canal: Canal completely divided along the length into two subsidiary canals.
Bulges: External protuberances of the cup.
Bumps: Outer wall structure in shape of a subspherical/hemispherical dome.
Similar: Tumuli, pustula.
Calicle: Longitudinal tubelike intervallar structure, which can be hexagonal or tetragonal in cross-section.
Canal Zone A: Intervallum side.
Canal Zone B: Cavity central side.
Canal: Pore modified by skeletal structure thikening or by lintels streching. Canal length is greater than perforation diameter.
Carcass wall not well defined: syn. Rudimentary perforate wall.
Carcass: part of wall on intervallum side.
Catenulate: Chainlike modular organization consisting of individuals united laterally generated by incomplete longitudinal subdivision.
Central cavity Empty: Without any skeletal structure in the central cavity or in the inner cavity.
Central cavity Full: With secondary skeletal structures in central cavity or in inner cavity.
Central cavity Reduce: Due to the large development of the inner wall.
Central cavity: Inner space delimited by the inner wall of two-walled cup.
In one-walled cup = inner cavity.
Chamber: Space bounded by adjacent arched tabulae and their contiguous walls in a thalamid cup.
Chimneys: Small tubelike structure stems from outer wall's pores.
Clathri: Additional wall consisting of a layer of longitudinal ribs with or without transverse lintels.
Coarsely porous: Pore diameter greater than lintels width.
Completely porous: Pores distributed frequently and uniformly.
Corolla: Umbrella-like structure projecting from external surface of cup.
Cup: Calcareous archaeocyathan skeleton.
Cup: Conical: Cup in form of inverted cone.
Cup: Cylindrical: Conical cup nearly cylinder.
Cup: Discoid: Flat.
Cup: Domal: Cup in vault.
Cup: Subspherical: Cup nearly spherical.
Denticulate: With indented rims.
Dictyonal network: Three-dimensional intervallar structure composed by taeniae with tetragonal pores linked by synapticulae at each interpore.
Divided pore: Pores irregularly divided by radial protrusions of lintels.
Downwardly opening: Opening on intervallum side is higher than the other one.
External budding: Type of asexual reproduction, bud on outer wall of parent cup.
External plates: Plate covering incompletely one or several perforations of a wall.
Facet: Any face of a calicle or syrinx.
Finely porous: Pore diameter smaller than lintels width.
Fold: Succession of more or less regular annulations of both walls.
Fused: Adjacent bracts or scales of the same horizontal file are incompletely amalgamated to form a single structure covering two or more perforations of a wall.
Habitus: Pattern of living.
Horizontal opening: Opening on intervallum side is as high as the other one.
Independent: Microporous sheath supported by short beams arising from carcass pore lintels.
Inner wall: Internal part of the skeleton, separating central cavity and skeletal structures, composed by a porous carcass, simple or coated by an additional sheath.
Interparietal budding: Type of asexual reproduction, bud in intervallum.
Intersept: Part of a wall or intervallum between two adjacent radial vertical structures (septa, taeniae...).
Interseptal plate: Porous plate linking adjacent radial-longitudinal partitions (septa, taeniae, etc).
NB: Resembling flat synapticula.
Intervallar cell: Part of intervallum bounded by adjacent radial-longitudinal partitions and tangential synapticulae.
Intervallum: Space enclosed between the walls.
Inverted V-shaped: Resembles A in longitudinal section.
Irregular folds: Folds aren't periodic and synchronous. They can be transverse and/or longitudinal.
Irregular: No geometrical pattern.
syn. Basic, rudimentary.
Lintel: Skeletal structure separating and bounding adjacent pores or canals.
Longitudinal fold: Succession of more or less regular transverse annulations of cup.
Longitudinal plates: Resembling septa.
Longitudinal subdivisions: Type of asexual reproduction, bud in intervallum generated by complete longitudinal subdivision.
Massive pseudocolony: Modular organization in which no individual cup can be seen and generated by contiguous addition of new aquiferous units.
Mesh: Network composed by a layer of vertical elements linked or not by horizontal skeletal element.
Micropores: Small and simple perforation of microporous sheath or sieve.
Microporous sheath: Thin skeletal plate supported by carcass and pierced by micropores (lesser diameter than pores).
Modular: Primitive colony. Skeleton formed by several cups resulted of subdivisions.
Morphological tubes: Artificial groups corresponding to a same aspect in longitudinal section of different morphological structures.
i.e.: V-shaped = straight canal + bract or V-shaped canal morphological structures.
Multichambered: Cup incorporating two or more chambers.
Multiperforate: With several openings.
Non-branching canal: Canal not completely divided.
Non-porous: Canal lacking connecting pores or any other connection with adjacent canals.
Outer wall: External part of the skeleton, composed by a porous carcass, simple or coated by a additional sheath.
Pecten: Thin-tooth comb (with rods) structure.
Perforation: pores, canals or vertical tubes
Pillar: Longitudinal rodlike structure connecting adjacent tabulae.
Plate: Porous plate linking adjacent radial-longitudinal partitions (septa, taeniae, etc).
NB: Resembles a flat synapticula.
Plicate wall: Each intersept is individually folded formed sharp mid-interseptal longitudinal ridge.
Polygonal: Often = quadrate.
Similar: Cambroid type, anthoid type.
Pore: Simple perforation of any skeletal structure. Pore diameter is greater than thickness of the structure.
Pores 2 distinct sizes: Each group has the same size of pores.
Pores Irregular repartition: Pores covering partially the wall.
Pores Regular repartition: Pores covered the whole wall.
Pores Uniform size: All pores have got the same size.
Poretube: Structure of elongate, scooplike to tubular shape completely or almost completely covering a single pore.
NB: Poretubes resemble canals but have a bract origin.
Porous: Canal connected to its neighbors either by pores piercing mutual canal walls.
syn.: Simple communicating.
Protrusion: Rod divided pores.
Pseudoclathri: Beams arising from carcass pore lintels support a layer of longitudinal ribs and transverse lintels.
Pseudoseptum: Planar or slightly waved irregularly porous partition linking both walls of a two-walled cup with a radial-longitudinal distribution.
Pustula (plur. pustulae): Wall structure covering an individual pore and pierced by a single central orifice.
NB: Pustulae resemble simple tumuli.
Regular folds: Folds are periodic and synchronous.
Reticulate: Polygonal pores, the diameter of which is greater than lintel width.
Scale: Plate incompletely covering two or more adjacent pores or intersepts in the same horizontal file. They are intermediate between fused bract and annulus.
Screen of planar rings: Successive horizontal annular shelves.
Septum (plur. septa): Planar porous partition linking both walls of a two-walled cup with a radial-longitudinal distribution.
Sieve: Aditional sheath stemmed from pores subdivisions.
Simple: Circular perforation.
Single wall: External part of the skeleton for one-walled cup, composed by a porous carcass, simple or coated by a additional sheath.
Single-chambered: Cup incorporating one chamber only.
Slitlike: Elongate elliptical shaped.
Solitary: Without subdivision or buds of the cup.
Sparsely porous: Rare pores irregularly distributed.
Spine: Skeletal structure comprising a narrow, elongate and typically tapering process with a circular to subcircular attachment area.
NB: Spines resemble bracts.
Spongiose: Massive inner wall consisting of elaborately waved, communicating canals.
syn.: Anastomosing communicating.
S-shaped: Resembles S in longitudinal section.
Stipule: Leaflike appendage arising from canal-bract junction in a wall of inverted-V or V-shaped appearance.
Stirrup: Perforation in front of each vertical intervalar structure. NB: Transverse section resembles stirrup.
Subdivided pore: Pores irregularly divided by radial protrusions of lintels.
Synapticula (plur. synapticulae): Narrow horizontal rod linking two adjacent vertical intervallar structures.
Syrinx (plur. syringes): Intervallar structure comprising porous radial horizontal or curved tube with hexagonal or tetragonal cross-section.
Tabella: Additional wall consisting of longitudinal ribs linked by transverse lintels.
Tabula (plur. tabulae): Transverse porous partition linking both walls of a two-walled cup.
Tabular plate: Incomplete tabula-like structure limited to several adjacent intersepta.
Taenia (plur. taeniae): Intervallar porous structure, non-planar, often dichotomous with a radial-longitudinal distribution.
Transverse fold: Succession of more or less regular longitudinal annulations of cup.
Tumulus (plur. tumuli): Outer wall structure in shape of a subspherical dome covering an individual and downwardly projected wall opening.
Upwardly opening: Opening on intervallum side is lower down than the other one.
Vertical intervallar structures: Longitudinal and often radial structures inside the intervallum (septa, taeniae...).
Vertical tube: One canal-like opening, longitudinally continuous along entire cup, bounded by longitudinal plates and lacking transverse partitions.
V-shaped: Resembles V in longitudinal section.
With participation of vertical intervallar structures: Formed by fluting of inner edge of septa.