The genae ("cheeks") are usually smooth, but in extremely rare cases they may possess small pits (scrobicules) of moderate depth.

[6] Lejopyge laevigata has a cosmopolitan distribution, making it an ideal intercontinental correlation tool in biostratigraphy.

In a monograph on Bohemian trilobites, Prodrom einer Monographie der böhmischen Trilobiten (1847), the Czech fossil collector Ignaz Hawle and botanist August Carl Joseph Corda established the genus Lejopyge using B. laevigatus as the type species.

They are sometimes found together, but most collections are uniformly composed of either of them, which rules out sexual dimorphism as an explanation for the differences.

Its first appearance at the GSSP section of the Huaqiao Formation in Hunan, China is defined as the beginning of the Guzhangian Age (around 500.5 million years ago) of the Miaolingian (Middle Cambrian).