Discovery of Extinct Long-Snouted Crocodilian

Why in News?

Recently, researchers identified a new species of extinct crocodilian, Herugavialis cairensis, which closely resembles the critically endangered gharial (Gavialis gangeticus) found today in Northern India.

• The fossil skull was originally recovered in the 1920s from northern Egypt's Mokattam Formation, the same limestone formation used to build the Great Sphinx of Giza.

Key Attributes

• Morphological Features - Possessed an elongated, narrow snout characteristic of gavialoids, specialised for piscivory (fish hunting) in ancient aquatic ecosystems.
• Modern high-resolution CT scanning revealed distinct internal cranial structures that differentiated it from Tomistoma (false gharials), establishing a new genus.
• Etymology & Cultural Echo - Named after Heru (Horus), the ancient Egyptian deity associated with the Great Sphinx.
• Coincidentally, like the Great Sphinx (which famously lacks its nose), the discovered skull fossil is notably missing the tip of its snout.
• Habitat & Paleoecology - During the Middle Eocene (~45 million years ago), northern Egypt was covered by shallow warm seas and tropical estuaries.
• Unlike living freshwater gharials, Herugavialis was a shallow-marine gavialoid that swam in ancient coastal waters alongside at least two other extinct gharial species.

Comparative Analysis

Significance

• It demonstrates that long-snouted gharials were once globally widespread, ecologically diverse, and highly adapted to marine environments before shrinking into isolated freshwater river systems in Asia.
• Shows how Mediterranean crocodilian diversity fluctuated in tandem with major global temperature drops and sea-level shifts during the Cenozoic Era, culminating in their total disappearance from the Mediterranean region around 6 million years ago.

Reference

Down to Earth | New species of extinct crocodilian