Description
This listing is for a genuine fossil ammonite, Reineckeia multicostata (Petitclerc), from the Middle Callovian stage of the Jurassic Period (approximately 165–164 million years ago). Found in France, this specimen represents one of the most distinctive ammonite genera of the Middle Jurassic. The fossil shown in the photographs is the exact specimen you will receive, carefully selected for its quality and preservation. Scale rule squares / cube = 1 cm – please see the images for accurate sizing. All of our fossils are 100% genuine specimens and are supplied with a Certificate of Authenticity.
Geological Context: Middle Callovian of the Jurassic
The Callovian stage is a key interval of the Middle Jurassic, characterised by widespread shallow seas and a flourishing of ammonite faunas across Europe. In France, richly fossiliferous clays and limestones of this age preserve an extraordinary range of ammonites that are used extensively for stratigraphic classification.
The Middle Callovian is especially significant for paleontologists because of the abundance of ammonites that define internationally recognised biozones. Fossils such as Reineckeia multicostata are used as index fossils, allowing geologists to date and correlate rock sequences across Europe and beyond.
The Species: Reineckeia multicostata (Petitclerc)
Reineckeia multicostata is a member of the order Ammonitida, superfamily Stephanoceratoidea, and family Stephanoceratidae. The genus Reineckeia is characterised by large, strongly ornamented shells with ribbing and tuberculation. The species R. multicostata is particularly noted for its multiple, closely spaced ribs that give it both its name and its striking appearance.
The shell morphology of Reineckeia multicostata typically shows compressed whorls with sharp ribbing that may bifurcate or branch, creating a complex ornamental pattern. These features make the species highly recognisable and diagnostically important within the Callovian ammonite record.
Ammonites such as R. multicostata were nektonic marine predators, swimming actively in open waters and preying on smaller marine organisms including crustaceans and molluscs. Their distinctive shells provided buoyancy control and protection while also serving as a key taxonomic feature for modern paleontologists.
Morphological and Scientific Features
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Stephanoceratidae
- Genus and Species: Reineckeia multicostata (Petitclerc)
- Geological Stage: Middle Callovian, Jurassic (c. 165–164 Ma)
- Locality: France
- Shell Traits: Large planispiral form, strong ribbing, multiple closely spaced ribs, compressed whorls
- Scientific Significance: Important index fossil of the Middle Callovian biozones
The distinct ribbing and overall morphology of Reineckeia multicostata make it one of the most important ammonites for Callovian stratigraphy. Its presence in fossil beds allows for precise subdivision of Jurassic sequences, highlighting its value both scientifically and historically.
Collector and Display Value
This fossil is both a scientifically important ammonite and a visually striking collector’s item. The bold ribbing and characteristic shape of Reineckeia multicostata make it instantly recognisable and desirable for collectors of Jurassic fossils. Its provenance from France further enhances its value, as the region is world-renowned for its rich Callovian ammonite faunas.
Owning this specimen provides a direct connection to the marine ecosystems of the Jurassic seas more than 160 million years ago. Its aesthetic beauty, combined with its role as an index fossil, ensures it holds both display and research importance.
Every specimen we supply is carefully chosen, guaranteed authentic, and accompanied by a Certificate of Authenticity. This Reineckeia multicostata ammonite represents a unique opportunity to add a significant piece of Middle Jurassic paleontology to your collection.
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