1 3 Ctenophora — Kinorhyncha 



Class Subcl Order 



RH YNCHOCOELA 



ribbon-worms, proboscis-worms 



NEMERTINEA 



Palaeonemertea 

 Heteronemertea 

 Hoplonemertea 

 Bdellonemertea 



ACANTHOCEPHALA 



spiny-headed-worms 



ACANTHOCEPHALA 



Archiacanthocephala 

 Palaeacanthocephala 

 Eoacanthocephala 



ROTI FERA 



(Rotatoria) 



rotifers, wheel-animalcules 



SEISONIDEA 



Seisonacea 

 BDELLOIDEA 



Bdellacea 

 MONOGONONTA 



Ploima 



Flosculariacea 



Collothecacea 



GASTROTRICHA 



gastrotrichs 



MACRODASYOIDEA 



Macrodasyidea 

 CHAETONOTOIDEA 



Chaetonotidea 



KINORHYNCHA 



ECHINODERA 



Echinodera 



