Taphonomist

 is a Tier 5 tank that upgrades from Undergunner and Naturalistbrid at Level 60.

Design
The looks like the Undergunner but its frontal barrel assembly is replaced with that of the Naturalist.

Technical
The front cannons fire identically to Naturalist while the drone spawner creates Underseer sunchips.

Trivia

 * Taphonomy is the study of how dead creatures decay and become fossilized, fitting the Underseer's death-themed naming scheme.