Any latest edition or successor of "Invertebrate zoology" by Ruppert & Barnes 2003?
A worthy successor to this book series is "Invertebrates" by Richard C. Brusca et al. The latest edition being from 2016, so exactly what I was looking for. 

https://www.amazon.com/gp/product/1605353752/ref=pe_353720_261047730_em_sp_C_1p_1_ti