Phiomia serridens

Phiomia serridens was a primitive proboscidean from the Late Oligocene, which lived approximately 37–30 million years ago in North Africa, especially in what is now Egypt. It represents an intermediate evolutionary phase in the early radiation of elephantiforms, showing a combination of archaic traits and characteristics that anticipate the morphology of modern elephants.

It was a medium-sized animal, with a body length of approximately 2.5–3 meters and an estimated height at the withers of around 1.5–1.8 meters. Its body mass likely ranged between 250 and 400 kilograms, depending on sex and age. Although considerably smaller than modern elephants, it already possessed a robust build, with a deep torso and columnar limbs adapted to bear weight.

The skull was elongated and relatively low, with a facial region extending forward. It had enlarged upper and lower incisors that formed incipient tusks. The lower incisors were particularly notable: projecting forward and slightly flattened, with serrated edges—hence the specific epithet serridens , meaning “serrated teeth”—suggesting a function in cutting or uprooting vegetation. The upper incisors, although less developed than in later elephants, already showed the evolutionary trend toward the formation of prominent tusks.

The mandible was long and relatively narrow, with an extended mandibular symphysis supporting the projecting lower incisors. The molars exhibited a bunodont pattern with low transverse ridges, suitable for a herbivorous diet based on soft vegetation, leaves, and possibly aquatic or riparian plants. Dental wear indicates a moderately abrasive diet, but one not specialized in tough grasses as in later proboscideans adapted to open environments.

The nasal region of the skull suggests the presence of a short proboscis or at least a muscular and flexible upper lip, although not as developed as in modern elephants. This feature marks an intermediate stage in the evolution of the nasal apparatus characteristic of the group.

Postcranially, the skeleton shows relatively straight limbs, with a developing graviportal posture. The cervical vertebrae were robust to support the elongated skull and forefeet. The tail was short and proportionately modest, without any notable specialization.

In phylogenetic terms, Phiomia serridens occupies a basal position within Elephantiformes and is key to understanding the transition from smaller, early proboscideans to larger, more specialized Miocene forms. Its anatomy clearly illustrates the progressive facial elongation, the modification of incisors into tusks, and the beginning of proboscis development—elements that would define the subsequent evolutionary history of elephants.

Approximate measurements of the Phiomia:

• 1:35 Scale Complete
  • Length 82 mm
  • Height 52 mm
  • Width 34 mm
  • Snout-tail base length 85 mm
    
    
• Complete 1:20 Scale
  • Length 137 mm
  • Height 87 mm
  • Width 56 mm
  • Length from snout to base of tail 150 mm