Mecyclothorax gourvesi Perrault 1978

Mecyclothorax gourvesi is a species of ground beetle in the subfamily Psydrinae. It was described by Perrault in 1978.

This species is known from both Mont Marau and Mont Aorai; from 1125–1400 m elevation on the former, and 1210–1400 m on the latter. Various male specimens were dissected to verify conspecificity of populations on the two ridge systems, with observed variation precluding division into two species. There is variability in the dorsoventral expansion of the median lobe apex, with two specimens from Marau exhibiting a narrow apical extension and narrowly spatulate apex (Fig. 36F) to broadly spatulate apex (Fig. 36G). A third Marau specimen exhibits a broader apical extension with moderately expanded apex (Fig. 36E), a conformation shared with a specimen from Aorai (Fig. 36H). Finally, a fifth specimen from Mont Aorai has a very broad apical extension with moderately expanded apex (Fig. 36I), though the teneral nature of the specimen may have influenced its conformation when temporarily slide-mounted for photography. Specimens have been collected from the rotten cambial layer under the bark of a dead Reynoldsia tree. They have been collected by beating Dicranopteris ferns, other soft ferns, or dead Cyathea tree fern fronds. Several were obtained through the use of pyrethrin fog applied to moss-covered Metrosideros, horizontal moss-covered logs, and banks of dead ferns. And two specimens were collected in a Malaise trap, indicating a penchant for climbing.