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Occurrence & distributionGBIF · PBDB68 records
Deep timePBDB1 fossils
02Traits & measurements
No structured trait data for this taxon yet.
07Deep time83.6–72.2 Ma
How far back this lineage goes — and how we know. Everything here is measured in Ma, short for “mega-annum”: millions of years ago. The chart reads left to right like a calendar of the Earth, from the deep past on the left to today at the right edgetop to bottom like a core drilled through the Earth, from the deep past at the top down to today at the bottom.
At a glance
Fossil range83.6–72.2 Ma Cretaceous
Dated fossil finds1
StatusExtinct no longer alive anywhere
When this lineage existed
How to read this: the coloured strip along the bottomdown the left is the geological calendar — the standard periods (Jurassic, Cretaceous…) every museum uses, shown so you can see which chapter of Earth's history this lineage lived in. The dashed rules marked ✦ are the five great mass extinctions. The solid bar is the fossil range: the span between the oldest and the youngest fossil that palaeontologists have assigned to Placenticeras whitfieldi. Above itBeside it, each dot is one dated fossil find — few enough to count, so they are drawn individually rather than as a graph.
fossil range (PBDB) †each dot = one dated findmass extinction
How it livedPBDB
Environmentmarine
Life habitnektonic
Dietcarnivore
Motilityfast-moving
Visionwell-developed
Compositionaragonite
08Occurrence & distribution
Record type68 records
Museum / vouchered1
Fossil67
Range
Area of Occupancy AOO4 km²
Museum / Voucheredphysical evidence
Backed by a physical specimen — a herbarium sheet, sample or voucher held in a collection. “Vouchered” means supported by material evidence, not just an observation.
