Browse Items (264 total)

Stratigraphic Range Jurassic to recent Taxonomy Phylum: MolluscaClass: BivalviaOrder: TrigoniidaFamily: Trigoniidae Distinctive Features RibsDentition, hingeGrowth lines Preservation Set 1:Mineral replacement of shell (aragonite to calcite)Set…

Species Liostrea Stratigraphic Range Triassic to Eocene Taxonomy Phylum: MolluscaClass: BivalviaOrder: Gryphaeidae Distinctive Features Growth linesTwo articulating valvesAdductor muscle scar Preservation Original shell material Advanced…

Stratigraphic Range Permian to Carboniferous Taxonomy Phylum: MolluscaClass: BivalviaOrder: PectinidaFamily: Pterinopectinidae Distinctive Features RibsUmboGrowth lines Preservation Compression between mud layersPotentially carbonization,…

Taxonomy Phylum: Mollusca Class: Bivalvia Diagnostic features Palial line/palial sinus Adductor muscle scars Growth lines Dorsoventral symmetry (some exceptions, for example Gryphaea) Two hinged valves Umbo Hinge Gills (rarely…

Taxonomy Phylum: MolluscaClass: CephalopodaOrder: Belemnitida Distinctive Features 'Bullet' shapeConical hole where phragmocone used to beRadial crystals (here in cross section) Preservation Peel of a cross section through a belemnite…

Species Hastatus Stratigraphic Range Jurassic Taxonomy Phylum: MolluscaClass: CephalopodaOrder: BelemnitidaGenus: Hibolites Distinctive Features 'Bullet' shapeGuard with radial crystalsHollow phragmocone area Preservation Mineral replacement…

Stratigraphic Range Carboniferous to Cretaceous Taxonomy Phylum: MolluscaClass: CephalopodaOrder: BelemnitidaSet 1:Group: CylindroteuthisSet 2:Group: unknown Distinctive Features Guard with radial calcite crystalsCrushed conical hole where…

Stratigraphic Range Carboniferous to Cretaceous Taxonomy Phylum: MolluscaClass: CephalopodaOrder: Belemnitida Distinctive Features Guard of radial calcite crystalsConical cavity where phragmocone used to be Preservation Aragonitic phragmocone…

Taxonomy Phylum: Mollusca Class: Cephalopoda Subclass: Coleoidea Cohort: Belemnoidea Diagnostic Features Diagram with labelled features of belemnites 'Bullet' shape Phragmocone: chambers divided by aragonitic septa (often preserved as conical…

Taxonomy Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Diagnostic features [See labelled diagram above] Aragonite shell Septa Suture (different for goniatites, ceratites and ammonites, see second diagram…