Final answer:
In Brachiopods, the coelom diverticula in mantle lobes are known as lophophore, which is a feeding and respiratory structure.
Step-by-step explanation:
In Brachiopods, the coelom diverticula in mantle lobes are called lophophore. The lophophore is a specialized feeding structure present in these animals that bears tentacles and helps in filter-feeding. This structure is also significant for gas exchange. The coelom in brachiopods serves as the main internal body space for organ development and also assists in the circulation of fluids, aiding the proper functioning of various body systems. The presence of diverticula in mantle lobes reflects the complexity and distinctive organization of the brachiopod's body plan, which falls under the classification of eucoelomate protostomes, specifically within the Lophotrochozoa group.