Cheloniellida is a taxon (usually referred to as an order) of extinct Paleozoic arthropods. As of 2018, 7 monotypic genera of cheloniellids had been formally...

Trilobita † Agnostida (possibly trilobites) † Nektaspida † Aglaspidida Cheloniellida † Bushizheia † Erratus † Fengzhengia † Fuxianhuiida † Isoxyida † Kiisortoqia...

Bergstrom, 1997 †Strabopida Hou & Bergström, 1997 †Aglaspida Walcott, 1911 †Cheloniellida Broili, 1932 Chelicerata Heymons 1901 Family †Sanctacarididae Legg &...

†Zhugeia Vicissicaudata †Xenopoda (possibly paraphyletic) †Sidneyia †Emeraldella †Etania †Kodymirus †Eozetetes †Carimersa †Cheloniellida †Aglaspidida...

†Trilobita Order †Aglaspida Order †Strabopida Class Pycnogonida (?) Order †Cheloniellida Subphylum Chelicerata Class Xiphosura Class †Eurypterida Class †Chasmataspidida...

†Archaeostraca Order †Hoplostraca Order Leptostraca Order †Emeraldellida Order †Cheloniellida Order †Sidneyiformes Order †Acanthomeridiida Order †Aglaspidida Order...

Emeraldella brocki Cheloniellida...

Emeraldella Eozetetes Kodymirus Sidneyia Carimersa Cheloniellida Cheloniellon Drabovaspis? Duslia Neostrabops Paraduslia Pseudarthron Triopus Aglaspidida...

Emeraldella Eozetetes Kodymirus Sidneyia Carimersa Cheloniellida Cheloniellon Drabovaspis? Duslia Neostrabops Paraduslia Pseudarthron Triopus Aglaspidida...

Emeraldella Eozetetes Kodymirus Sidneyia Carimersa Cheloniellida Cheloniellon Drabovaspis? Duslia Neostrabops Paraduslia Pseudarthron Triopus Aglaspidida...