NEMERTINA-ASCHELMINTHES 



17 



Order BDELLONEMERTINA 



( = Bdellomorpha) 

 Malacobdella 



Phylum ASCHELMINTHESi 



Class ROTIFERA (wheel animalcules) 



( = Rotatoria) 



Class GASTROTRICHA 



Class ECHINODERIDA 



( = Kinorhyncha) 



Order SEISONIDEA 



Seison 

 Order BDELLOIDEA 



Habrotrocha; Philodina; Rot aria ( = Rotifer); 



Adineta; Philodinavus ( = Microdina) 

 Order MONOGONONTA 

 Sub-order Ploima 



Brachionus; Keratella (=Anuraea); Epiphanes 



(=Hydatina); Euchlanis; Lepadella {= Metopidia) , 



Lecane i = Cathypna, Distyla); Monostyla; 



Notommata; Asplanchna 

 Sub-order Flosculariacea 



Testudinella (=Pterodina); Filinia { — Triarthra); 



Hexarthra (=Pedalia, Pedalion); Trochosphaera; 



Floscularia ( = Melicerta); Conochilus 

 Sub-order Collothecacea 



Collotheca {= Floscularia) ; Stephanoceros 



Order MACRODASYOffiEA 



Cephalodasys 

 Order CHAETONOTOIDEA 



Neodasys; Chaetonotus 



Centroderes; Echinoderes; Pycnophyes 



Class PRIAPULIDA^ 



Priapulus; Halicryptus 



Class NEMATOMORPHA (horse-hair worms) 



( - GoRDiACEA) Order NECTONEMATOIDEA 



Nectonema 

 Order GORDIOIDEA 

 Chordodes; Gordius 

 Class NEMATODA (roundworms)^ 

 (=Nemata) 



Sub-class PHASMIDIA 



Order RHABDITmA 

 Sub-order Rhabditina 



Rhabditis; Diplogaster; Cephalobus; Panagrellus 

 (sour paste eelworm); Turbatrix (vinegar eelworm); 

 Rhabdias (lung ntrndLiodo); Strongyloides 



^ Nemathelminthes, sometimes used as a synonym for Aschelminthes, only applies to Nematomorpha and 

 Nematoda. 



^ The Priapulida may equally well be considered as a phylum. They have also been grouped with the 

 Echiuroidea, p. 23 and Sipunculoidea, p. 23 as Gephyrea. 



' Classification by Chitwood & Chitwood (1950) and Thorne (1949). 



