Gesomyrmex hoernesi

Introduction

Gesomyrmex hoernesi is an extinct ant species preserved in Baltic amber from the Late Eocene period, approximately 46 million years ago. This fossil ant belongs to the Formicinae subfamily and was first described by Mayr in 1868 from specimens found in Baltic amber deposits . Workers were dimorphic, with minor workers measuring 2.5-5mm and major workers reaching 5-8mm, making them comparable in size to many common garden ants today . The species is characterized by distinctive nine-toothed mandibles, very large eyes, and an eight-segmented antenna . This species represents a fascinating window into prehistoric ant communities. Gesomyrmex was an arboreal genus, living in the ancient forests that produced Baltic amber, and represents a tropical ant lineage that indicates warm, humid conditions across Europe during the Eocene . The genus shows worker polymorphism with three distinct asexual castes including supersoldiers, making it one of the most morphologically complex fossil ant species known .