Description
Homoeoplanulites paekachoffati Ammonite Fossil – Genuine Middle Jurassic Specimen
This is a genuine Homoeoplanulites paekachoffati ammonite fossil from Deux-Sèvres, France. Dating to the Lower Callovian stage of the Middle Jurassic, this specimen represents an attractive and scientifically interesting marine cephalopod from the ancient Jurassic seas of western Europe. Homoeoplanulites is part of the wider perisphinctid ammonite group, a highly important lineage known for its coiled shells, ribbed ornamentation, and value in identifying and correlating Jurassic rock layers.
This fossil is a carefully chosen specimen, with the photograph showing the actual fossil you will receive. It also includes a Certificate of Authenticity lifetime guarantee generic card, making it an excellent choice for fossil collectors, geology students, natural history displays, educational collections, and anyone interested in genuine Jurassic ammonites from France.
Geology, Age and Location
This ammonite comes from Deux-Sèvres, France, and is dated to the Lower Callovian. The Callovian is the final stage of the Middle Jurassic, approximately 166 to 164 million years ago. During this time, much of western Europe was covered by warm, shallow to moderately deep epicontinental seas. These marine environments supported a rich and varied fauna including ammonites, belemnites, nautiloids, bivalves, brachiopods, gastropods, echinoids, crinoids, corals, fish, and marine reptiles.
Deux-Sèvres and the wider western French Jurassic successions are known for marine sedimentary rocks that preserve important ammonite faunas. Fossils from this region record a time when sea levels, sedimentation, and marine ecosystems were changing across Europe. Callovian ammonites are especially valued because they are widely used in biostratigraphy, helping geologists divide the Jurassic into finer time intervals based on distinctive fossil assemblages.
Fossil Type and Species
Homoeoplanulites paekachoffati is an ammonite, an extinct marine cephalopod related to modern squid, cuttlefish, octopus, and nautilus. Ammonites had chambered shells divided internally by walls called septa. The living animal occupied the final outer body chamber, while the earlier chambers helped regulate buoyancy as it moved through the water column.
Homoeoplanulites is generally associated with the ammonite order Ammonitida and the superfamily Perisphinctoidea, one of the most characteristic ammonite groups of the Jurassic Period. Perisphinctid ammonites are recognised for their planispiral coiling, visible umbilicus, and ribbed shell ornamentation. These features make them both visually appealing and scientifically useful, as differences in shell shape, ribbing, and whorl proportions can help distinguish related forms and date the rocks in which they are found.
Morphology and Collector Appeal
Homoeoplanulites ammonites typically display the classic flat-coiled ammonite form, with whorls arranged in a natural spiral around a central umbilicus. Depending on preservation and growth stage, this specimen may show rounded to moderately compressed whorls, ribbed ornamentation across the flanks, natural shell contour, internal mould detail, or chamber-related structure. The ribs may vary in spacing and strength as the animal grew, recording part of the original shell growth pattern.
This type of ammonite has strong collector appeal because it combines natural symmetry with clear palaeontological character. The spiral shell is instantly recognisable, while the ribbed structure provides a direct link to the animal’s growth, anatomy, and place within Jurassic cephalopod evolution. Even where some details are naturally worn or preserved as an internal mould, the fossil remains an authentic and attractive example of ancient marine life.
A Lower Callovian ammonite from France is also an excellent educational specimen. It helps illustrate ammonite anatomy, fossilisation, Jurassic marine ecosystems, and the importance of ammonites in geological dating. It pairs well with other Jurassic fossils such as belemnites, nautiloids, bivalves, and marine reptile material.
Depositional Environment
During the Lower Callovian, the area that is now Deux-Sèvres lay within a broad marine setting connected to the Jurassic seas of western Europe. Ammonites such as Homoeoplanulites lived in the water column, using their chambered shells for buoyancy while feeding as active predators or scavengers. They shared these seas with many other marine organisms, creating a diverse ecosystem at a time when dinosaurs lived on nearby landmasses.
After death, the ammonite shell could sink to the seabed and become buried by sediment. Over millions of years, mineralisation, compaction, and geological change preserved the remains as a fossil. This process created a lasting record of the Middle Jurassic marine world, giving the specimen both scientific interest and strong display value.
Authenticity and Display
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. This Homoeoplanulites paekachoffati ammonite fossil is supplied with a lifetime guarantee generic COA card for confidence and peace of mind.
Full sizing: please see photo.
The fossil shown in the photograph is the actual specimen you will receive. This genuine Lower Callovian Homoeoplanulites paekachoffati ammonite from Deux-Sèvres, France is a superb addition to a fossil collection, natural history cabinet, geology teaching set, Jurassic display, or collection of genuine marine cephalopod fossils.
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