Coleoptile

 is a Tier 5 Tank that upgrades from Cicada, Sheath and Tri-Hewn Pelleter at level 60.

Design
The is a Cicada whose Machine Gun barrels are all upgraded to Submachine ones. It looks like Sheath with the secondary guns of Cicada attached to it.

Trivia

 * A coleoptile is a protective layer that forms around newly planted grasses, or in other words a biological sheath.