Browse Items (264 total)

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…

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: 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: 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: Hemichordata Class: Graptolithina Diagnostic features Stick-shape (often branched) One or both edges may appear serrated Thecae Rhabdosome Stipes Stratigraphic range Cambrian to Carboniferous (Dendroids) Ordovician to Middle Devonian…

Taxonomy Phylum: Mollusca Class: Cephalopoda Diagnostic features Simple suture Chambers Central siphuncle Straight, curved or coiled shell Stratigraphic range Cambrian to recent Straight forms: Cambrian to Permian Coiled forms: Devonian to…

Taxonomy Phylum: Cnidaria Class: Anthozoa Diagnostic features Radial or biradial symmetry External skeleton Septa Tabulae Stratigraphic range Ordovician to present Tabulate, rugose: Ordovician to Permian (extinct at P/T extinction) Scleractinian:…

Stratigraphic Range Ordovician to Carboniferous Taxonomy Phylum: BrachiopodaClass: StrophomenataOrder: StrophomenidaFamily: RafinesquinidaeGenus: Leptaena Distinctive Features Bilateral symmetryRibsGrowth lines Preservation Mineral replacement…

Species Terebratula maximes Stratigraphic Range Pliocene to Pleistocene Taxonomy Phylum: BrachiopodaClass: RhynchonellataOrder: TerebratulidaGenus: Terebratula Distinctive Features Bilateral symmetryTwo articulated valvesGrowth…

Species Terebratula biplicata Stratigraphic Range Cretaceous Taxonomy Phylum: BrachiopodaClass: RhynchonellataOrder: TerebratulidaGenus: Terebratula Distinctive Features Bilateral symmetryTwo articulated valvesCommissurePedicleGrowth…