卓越した、よく保存されたメガロサウリダ科の cf. アフロヴェナトル類の肉食恐竜の歯 - 中生代中期 - 化石歯 (No reserve price)

Scientific name: Theropod Dinosaur Tooth - Megalosaurid cf Afrovenator abakensis

Location: Tiouraren Hill, Téneré Desert, Niger.

Geological Formation: Tiouraren Fm

Age: Middle Jurassic, Bathonian stage ( 167 million years)

Size: 4,6cm

REF.: #J731

DESCRIPTION:
An exceptional and beautifully preserved authentic megalosaurid theropod tooth from the Middle Jurassic deposits of the Agadez region, Niger.

This remarkable specimen exhibits magnificent natural enamel coloration and exceptionally well-preserved serrations along its cutting edges (carinae).

The specimen is entirely natural, it only has one glued and tiny filled fracture near the tip.

Its distinctive morphology suggests a possible premaxillary position. Megalosaurid teeth are generally characterized by their recurved shape, lateral compression, and finely serrated cutting edges, adaptations associated with their predatory feeding habits.

Although this specimen may be attributable to Afrovenator abakensis, precise identification remains challenging, as isolated megalosaurid teeth often share similar morphological characteristics across different genera and species.

An outstanding Jurassic theropod tooth, combining exceptional preservation, beautiful natural coloration, remarkably preserved serrations, and complete authenticity.

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Although an isolated tooth may be morphologically compatible with Afrovenator, assigning an isolated crown confidently to Afrovenator—and particularly to the species Afrovenator abakensis—requires considerable caution.

Theropod teeth are relatively simple anatomical structures, and many unrelated predatory dinosaurs independently developed similar laterally compressed, recurved and serrated crowns. This phenomenon of dental homoplasy means that superficially similar tooth morphologies can occur in distantly related theropod lineages. Modern studies therefore emphasize that isolated theropod teeth are frequently much easier to identify at a broad family or morphotype level than at genus or species level.

A further complication is heterodonty within a single animal. Tooth morphology can change considerably along the premaxillary, maxillary and dentary tooth rows. Crown curvature, basal cross-section, labiolingual compression, carinal position, serration density and even the development of particular enamel features may vary according to tooth position. Consequently, two teeth belonging to the same individual can sometimes appear surprisingly different.

Ontogenetic variation, individual variation, tooth wear, incomplete preservation, erosion of the enamel and denticles, and deformation during fossilization introduce additional uncertainty. Measurements such as crown height, crown base length, crown base width, crown base ratio, curvature, mesial and distal denticle density, and the relative development of the carinae are therefore considerably more informative when evaluated together than any single morphological feature. Quantitative and multivariate approaches have consequently become important tools for assessing isolated theropod teeth.

For this reason, an isolated tooth from the Tiourarén Formation possessing the expected morphology should preferably be described as “cf. Afrovenator,” “Afrovenator-like,” or “theropod tooth morphologically consistent with Afrovenator” unless diagnostic comparisons and strong stratigraphic and locality data provide sufficient evidence for a more precise attribution.

An assignment specifically to Afrovenator abakensis should therefore be considered a taxonomic interpretation rather than an absolute identification when the specimen consists solely of an isolated tooth. Associated cranial or skeletal material provides a substantially stronger basis for species-level identification than dental morphology alone.