Sumda'te-pattern Scarab

The Type-36 Ultra Heavy Siege Platform, colloquially known as the Scarab, is a Covenant quadrupedal mining platform. Likely a field modification, T-36 Scarabs are fitted with a massive Class-4 plasma cannon, analogous to those fitted on the Type-27 Mantis. These vehicles used a range of different chassis designs, though their performance characteristics were nearly homogenous.

Production note
According to Catalog, the Scarab that appears in Halo 2 is designated Type-36. This contradicts Halo: The Essential Visual Guide as well as Palace Hotel, both of which identify the Halo 2 Scarab as a Type-47. It was later clarified that the Scarab in Halo 2 is the T-47A.