Browse Items (5 total)

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…

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…