Browse Items (264 total)

Taxonomy Phylum: Arthropoda Class: Trilobita Distinctive features Pygidium (tail) Thorax (body) Cephalon (head) Paired appendages (not often preserved) Three lobed longitudinal division of body (2x pleural, 1x axial) Calcitic exoskeleton Segmented…

Taxonomy Phylum: Mollusca Class: Gastropoda Diagnostic Features Coiled shell - planispiral or helical - consists of body whorl and spire Mostly aragonitic shell Shell consists of one large chamber (no septa) Aperture Siphonal notch Way of…

Taxonomy Phylum: Echinodermata Class: Crinoidea Diagnostic Features Crown Stalk Pentaradial symmetry Ossicles Calyx Pinnule Holdfast Way of life Benthic (some pseudoplanktonic) Filter feeders Stratigraphic range Ordovician to present Advanced…

Taxonomy Phylum: Echinodermata Class: Echinoidea Diagnostic features Ambulacra (tube feet) Periproct (opening for anus) Peristome (opening for mouth) Pentaradial symmetry (regular echinoids) Bilateral symmetry imposed upon pentaradial symmetry…

Stratigraphic Range Silurian Taxonomy Phylum: CnidariaClass: AnthozoaOrder: TabulataGenus: Halysites Distinctive Features Halysites is a so-called 'chain coral'. Unsurprisingly it can be identified as it has a distinctive 'chain' appearance,…

Species Isastraea explanata (also Isastrea explanata) Stratigraphic Range Jurassic Taxonomy Phylum: CnidariaClass: AnthozoaOrder: ScleractiniaGenus: Isastrea Distinctive Features SeptaWeak columella Preservation External mould (of the 'top'…

Stratigraphic Range Ordovician to Permian Taxonomy Phylum: CnidariaClass: AnthozoaOrder: Tabulata Distinctive Features SeptaColonialColumellaPolyps Preservation Mineral replacement of skeletonPrecipitation of minerals in spaces Advanced…

Stratigraphic Range Ordovician to Permian Taxonomy Phylum: CnidariaClass: AnthozoaOrder: Tabulata Distinctive Features TabulaeColonial Preservation Mineral replacement of skeleton Advanced notes Due to the way that this specimen has been cut…

Stratigraphic Range Ordovician to Permian Taxonomy Phylum: CnidariaClass: AnthozoaOrder: Rugosa Distinctive Features SeptaGrowth lines'Horn' shape

Stratigraphic Range Triassic to present Taxonomy Phylum: CnidariaClass: AnthozoaOrder: Scleractinia Distinctive Features Branching structurePolypsSepta Preservation Original skeleton material