[1] Neanaperiallus masneri is known only from one fossil, the holotype, number "AMNH B-JWJ-265", which is a single female specimen preserved in a nearly round amber block shaped with five unequal sides.

[1] The generic name was coined by Gary Gibson as a combination of the Ancient Greek word periallos, meaning "before all others", and from "neana" from the subfamily name Neanastatinae.

The specific epithet "masneri" was designated by Gary Gibson in honor of Lubomír Masner in recognition of his many contributions to the study of parasitic wasps.

The general coloration is a yellow tone, but it is possible the species may have in fact been a uniform brown based on clear views of the acropleuron and several of the abdomen tergites.

Because of the shape and short length of the ovipositor sheath Gibson postulates that Neanaperiallus masneri was parasitic on hosts which were exposed or near the surface of wood or other substrates.