Browse Items (25 total)

Stratigraphic Range Modern Taxonomy Phylum: EchinodermataClass: EchinoideaSubclass: Regularia Distinctive Features Pentaradial symmetryAnus and peristome in lineSpine attachmentsAmbulacraAttachments for the jaw apparatus visible on the inside of…

Taxonomy Phylum: EchinodermataClass: EchinoideaSubclass: Regularia Distinctive Features Pentaradial symmetryAnus and peristome lie in lineSpine attachmentsFive sets of ambulacra Preservation Cast (internal mould of an external mould) Advanced…

Stratigraphic Range Upper Cretaceous Taxonomy Phylum: EchinodermataClass: EchinodeaSubclass: IrregulariaOrder: Holasteroida Distinctive Features Bilateral symmetryMouth and anus out of lineFive radial ambulacraInterambulacra with…

Stratigraphic Range Cretaceous Taxonomy Phylum: EchinodermataClass: EchinoideaSubclass: IrregulariaOrder: EchinoneoidaGenus: Conulus Distinctive Features Bilateral symmetryFive radial ambulacraInterambulacraMigrated periproct (opening for…

Species Praecursor Stratigraphic Range Cretaceous Taxonomy Phylum: EchinodermataClass: EchinoideaSubclass: IrregulariaOrder: SpatangoidaGenus: Micraster Distinctive Features Bilateral symmetryFive radial ambulacraPeristome (opening for mouth)…

Species depressus Lestre Stratigraphic Range Jurassic Taxonomy Phylum: EchinodermataClass: EchinoideaSubclass: IrregulariaOrder: HolectypoidaGenus: Holectypus Distinctive Features Bilateral symmetryFive radial ambulacraSpine attachment scars…

Stratigraphic Range Jurassic Taxonomy Phylum: EchinodermataClass: CrinoideaOrder: MillericrinidaGenus: Apiocrinites Distinctive Features Pentaradial symmetryCalyxAttachment point for 'arms' of the animal Preservation Cast (manmade)

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: 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:…