53 Annelida — Arthropoda 



Class Subcl Order 



PENTASTOM I DA 



LINGUATULIDA REC 



Cephalobaenida REC 



Porocephalida (Linguatulodea) REC 



ONYCHOPHORA^^ 



PERIPATIDEA cam-rec 



Protonychophora CAM 



Euonychophora REC 



ARTHROPODA «2 



TRILOBITOIDEA '' cam-pen 



Merostomoidea (Xenopoda) cam 



Limulavida {Prochelicerata, Limulava) CAM 



Emeraldellida CAM 



Nectaspida cam 



Leanchoiliida (Pseudanostraca) CAM 



Pseudonotostraca (Pseudocrustacea) cam 



Burgessiida cam 



Waptiida cam 



Marrellomorpha ^ (Marellomorpha) CAM 



Marrellida cam 



Hymenocarina cam 



Hymenocarina cam 



Arthropleurida PEN 



Arthropleurida PEN 



Cheloniellida dev 



Cheloniellida dev 



Opabiniida CAM 



Palaeanostraca cam 



PHYLA + DiPLOPODA + CHiLOPODA + INSECTA. Hypaithropoda was proposed for 



hypothetical ancestral forms. A separate class Arthrocephala is listed by Boettger 



in the Chelicerata, but no other reference to such an extinct group has been found. 



Diantennata = trilobitomorpha + Crustacea. Branchiata = trilobitomorpha 



+ CHELICERATA + MANDIBULATA. Accrata = MEROSTOMATA + ARACHNmA. Arach- 



nomorpha = trilobitomorpha + Crustacea. Myriapoda = pauropoda + sym- 



PHYLA + DIPLOPODA + CHILOPODA. PrOgOneata = SYMPHYLA + DIPLOPODA + 



pauropoda. Antennata = pauropoda + symphyla + diplopoda + chilopoda + 

 INSECTA. Opisthogoneata = chilopoda + insecta. Includes: Marriocarida, of un- 

 known position. 



^^ Homopoda = marrellina + pseudanostraca + pseudonotostraca + 

 hymenocarina. 



^* Includes: Mimetasterida, Pygaspida, Proarthropoda. 



