Gw mau tau Kelas Thecostraca Gruvel, 1905 dari Thecostraca

Ordo Lithoglyptida Kolbasov, Newman & Hoeg, 2009

Ordo Cryptophialida Kolbasov, Newman & Hoeg, 2009

Superordo Phosphatothoracica Gale, 2019 ( parafiletik )

Ordo Eolepadomorpha Chan et al., 2021

Ordo Iblomorpha Buckeridge & Newman, 2006

Ordo Calanticomorpha Chan et al., 2021

Ordo Archaeolepadomorpha Chan et al., 2021

Ordo Scalpellomorpha Buckeridge & Newman, 2006

Ordo Pollicipedomorpha Chan et al., 2021

Kladogram berikut menggambarkan hubungan internal Thecostraca per tahun 2021.