RARE Fossil Ammonite Bullatimorphites (Bomburites) microstoma – Callovian, Jurassic – Ebingen, Germany – Alice Purnell Collection

RARE FOSSIL AMMONITE – Bullatimorphites (Bomburites) microstoma

Callovian Stage | Middle Jurassic (~164–166 million years ago)

Ebingen, Baden-Württemberg, Germany

From the Alice Purnell Collection

Certificate of Authenticity Included

This listing features a scientifically important and rare fossil ammonite,
Bullatimorphites (Bomburites) microstoma, from the Callovian Stage of the Middle Jurassic, discovered in Ebingen, Germany. This ammonite represents a transitional form within the Sonniniidae lineage and offers a remarkable glimpse into Middle Jurassic marine ecosystems.

Each specimen in our collection is individually selected and presented as photographed — the exact fossil shown is the one you will receive. A scale cube (1cm) is included in the photos for accurate size reference. See image gallery for full sizing.

GEOLOGICAL & TAXONOMIC DETAILS:

• Species: Bullatimorphites (Bomburites) microstoma
• Family: Sonniniidae
• Superfamily: Hildoceratoidea
• Order: Ammonitida
• Class: Cephalopoda
• Phylum: Mollusca
• Geological Stage: Callovian (Middle Jurassic)
• Locality: Ebingen, Swabian Jura, Baden-Württemberg, Germany
• Depositional Environment: Shallow marine shelf environments with clay-marl alternations and moderate energy; a habitat rich in cephalopods, bivalves, and occasional crinoids
• Possible Biozone: Likely from within the Macrocephalites gracilis Zone, a known regional ammonite zone within the Callovian of southern Germany
• Notable Identification History: Originally assigned to the genus Bomburites, this taxon is now treated as a subgenus of Bullatimorphites

MORPHOLOGY & FEATURES:

• Shell Form: Small, involute shell with a narrow umbilicus
• Ribbing: Fine and weak ribbing on inner whorls; more subdued on adult body chamber
• Aperture: Characteristically small and constricted (hence the name "microstoma")
• Diagnostic Traits: Subglobular shape and a short phragmocone give this species its distinctive morphology
• Palaeontological Relevance: Important for biostratigraphy and for understanding morphological variation within Sonniniidae; forms part of a lineage adapting to restricted or deeper water marine conditions

COLLECTOR & DISPLAY VALUE:

This authentic piece is from the Alice Purnell Collection, renowned for scientifically verified and curated palaeontological specimens. Its excellent preservation, precise identification, and provenance from a well-documented Jurassic site in Germany make it a valuable addition to any serious fossil collection or educational display.

SPECIMEN DETAILS:

• Species: Bullatimorphites (Bomburites) microstoma
• Geological Age: Callovian Stage, Middle Jurassic (~165 Ma)
• Formation: Likely from the Ornatenton Formation (German Callovian marine facies)
• Locality: Ebingen, Germany
• Provenance: Alice Purnell Collection
• Condition: Fine detail preserved, showing characteristic morphology
• Certification: Comes with a Certificate of Authenticity
• Scale Reference: Cube = 1cm (see photos for accurate sizing)

A genuinely rare and academically relevant ammonite with aesthetic and scientific appeal, this fossil is a window into the Jurassic seas of ancient Europe.