SEGMENTED SCHIZOCOELS 225 



TAXONOMIC SUMMARY. 



Kingdom Animalia (L. antmalis, animate) animals 



Subkingdom Eumetazoa (Gr. eu-, true + meta, among + zoon, animal) — eumetazoans 



Grade Bilateria (L. bi-, two + lateralis, side) 



Eucoelomata (Gr. eti-. true + koilos, hollow) 



Schizocoela (Gr. schizo, cleave + koilos) 



Phylum Annelida (L. annelus, little ring) — segmented worms 

 Class Polychaeta {Gr. poly, many + chaite, hair) — marine segmented worms 

 Class Oligochaeta (Gr. oligos, few + chaite) — earthworms and allies 

 Class Hirudinea (L. hirudo, leech) — leeches 



Phylum Arthropoda (Gr. arthron, joint + podos, foot) — joint-legged animals 

 Subphylum Onychopora (Gr. onychus, claw + pharos, bearing) — joint-legged worms 

 fSubphylum Trilobita (Gr. trias, three + lobes, lobe) — trilobites 

 Subphylum Chelicerata (Gr. cAe/f, claw + keraos ,\\OTny) — chelicerates 

 Class Merostomata (Gr. meros, thigh -|- stoma, mouth) — merostomates 

 f Subclass Eurypterida (Gr. eurys, broad + pteryx, wing) — sea scorpions 

 Subclass Xiphosura (Gr. xiphos, sword + oura, tail) — horseshoe crabs 

 Class Pycnogonida (Gr. pyknos, compact -|- gonos, gonad) — sea spiders 

 Class Arachnida (Gr. arachne, spider) — arachnids 

 Order Scorpionida (Gr. skorpion, scorpion) — scorpions 

 Order Pseudoscorpionida (Gr. /).rcwrff.f, false + skorpion) — pseudoscorpions 

 Order Phalangida {Gr.phalangion, a spider) — harvestmen or daddy longlegs 

 Order Acarina (Gr. akan, a mite) — mites and ticks 



Order Solpugida (L. solpuga, poisonous ant or spider) — sun spiders or wind scorpions 

 Order Pedipalpi {h.pes, foot + palpus, feeler) — whip scorpions 

 Order Palpigrada (L. palpus + gradior, to walk) — micro whip scorpions 

 Order Araneae (L. aranea, a spider) — spiders 

 Subphylum Pentastomida (Gr./)?r!/a, five + stoma) — tongue worms 

 Subphylum Tardigrada (L. tardus, slow + gradior) — water bears 

 Subphylum Mandibulata (L. mandibula, jaw) — mandibulates 

 Class Crustacea (L. crusta, shell) — crustaceans 

 Subclass Branchiopoda (Gr. bronchia, gills + podos, foot) — branchiopods 

 Order Anostraca (Gr. an- without + ostrakon,%\\e.\\) — anostracans 

 Order Notostraca (Gr. noton, back -|- oslrakon) — tadpole shrimps 

 Order Conchostraca (Gr. konche, sheel + ostrakon) — claw or clam shrimps 

 Order Cladocera (Gr. klados, a branch + keras, horns) — water fleas 

 Subclass Ostracoda (Gr. ostrakon) — ostracods 

 Subclass Copepoda (Gr. kope, handle or oar + podos) — copepods 

 Subclass Cirripedia (L. cirrus, curl -|- podos) — barnacles 

 Subclass Malacostraca (Gr. ma/ate, soft + ostrakon) — malacostracans 

 Order Isopoda (Gr. isos, equal -|- podos) — isopods 

 Order Amphipoda (Gr. amphi, apart + podos) — scuds 

 Order Stomatopoda (Gr. stomatos, mouth + podos) — mantis shrimps 

 Order Decapoda (Gr.deka, ten + podos) — decapods 

 Class Diplopoda [Gr.dtploos, double + podos) — millipedes 

 Class Chilopoda (Gr. cheilos, margin + podos) — centipedes 

 Class Pauropoda {Gr.pauros, small -|- podos) — pauropods 

 Class Symphyla (Gr. syn, together + phylon, tribe) — garden centipedes 

 Class Insecta (L. insectus, divided) — insects 

 'Extinct. 



