Emplapomorphidae

Emplapomorphidae is a subfamily of extinct beetles in the family Passalidae. They are known from fossil records found in various parts of the world, including North America, Europe, and Asia.

The Emplapomorphidae are thought to have evolved during the Cretaceous period, with early species documented in rocks dating to around 100 million years ago. These beetles were likely saproxylic, meaning they lived on or near decaying wood. They had long, slender bodies, typically with lengths between 10 and 20 millimeters.

Characters used to identify Emplapomorphidae fossils include the shape and structure of the elytra, or wing covers, as well as the head, mandibles, and internal features of the thorax and abdomen. Certain species of Emplapomorphidae are notable for their well-preserved genitalia, which have allowed for enhanced characterization and finer distinction among species.

The family was likely small, consisting of a few dozen to a few hundred species, and relatively short-lived. What is known of Emplapomorphidae suggests they may have been endemic to certain regions, which could have contributed to their decline or eventual extinction. Overall, Emplapomorphidae remains a poorly understood group, though ongoing paleontological research continues to shed light on their biology and broader significance within the history of Passalidae.