He calls them closely related to Obrimus bufo and distinguishes them from the latter by the slightly different spines on the body and legs.

The main difference is the lateral pits in the metasternum, which also give the species its name ("cavernousus" Latin for cave-like).

This is smaller and, according to Redtenbacher, differs in the female gender by the larger, but flatter, four spines on the basal segments of the abdomen.

The other two specimens, two males, come from the collection of what is now the National Museum of Natural History in Washington, D.C.[6] In fact, the specimens from Hebard's collection examined by Rehn and Rehn, which come from the island Siargao off Mindanao, belong to the Brasidas rehni, which was described in 2023 by Hennemann.

[4] The females of the species reach 9.6 to 11.4 centimetres (3.8 to 4.5 in) in length and are therefore among the largest representatives of the obrimini along with Trachyaretaon carmelae.

The small, black tubercles, which are often typical for representatives of the genus, are particularly present in the area of the meso- and metanotum.

The beige to yellowish longitudinal line from the pronotum to the front abdomen, which also occurs in some females, is always more or less clearly present.

[6] The representatives of the species examined by Sarah Bank are exclusively animals from Luzon, more precisely from the southeastern province of Sorsogon from Mount Pulog (not to be confused with Mount Pulag located in the north of Luzon), as well as from the offshore island Rapu Rapu in the province of Albay.

[10] In October 2011, the Frenchman Thierry Heitzmann, who lives in the Philippines, collected four pairs of this species on the island of Rapu-Rapu.

After the animals did not eat well and three of the four pairs died, the fourth female laid enough eggs to be able to send some to Europe.

From the animals identified as Euobrimus lacerta, he sent some eggs to the Dutchman Rob Krijns, who successfully bred them and distributed the offspring in Europe.

[10] The resulting breeding line is listed by the Phasmid Study Group under the PSG number 377 and the name Euobrimus lacerta used by Heitzmann.