ARTHROPODA 



31 



Class MEROSTOMATA* 



Class ARACHNTOA* 



Order DECAPODA^ 



Sub-order Natantia 

 Penaeiis, Pandalus, Palaemon ( =Leander) (prawns); 

 Crangon ( = Crago), Hippolyte (shrimps) ; 

 Maaobrachium ( = Palaemon) (river prawn) 



Sub-order Reptantia 

 Cambarus, Astacus (=Potamobius) (fresh- water 

 crayfish); Homarus Oobster); Nephrops (Norway 

 lobster) ; Jasus (kreef ) ; Palinurus Oangouste, craw- 

 fish) ; Panulirus (rock lobster) ; Cancer (edible crab) ; 

 Pagurus {=Eupagurus), Dardanus (=Pagurus) 

 (hermit crabs); Lithodes (stone crab); Carcinus 

 (shore crab) ; Maia (spider crab) ; Callinectes (blue 

 crab); Potamon ( = Telphusa) (river crab); Uca 

 (fiddler crab) 



Order XIPHOSURA (king crabs) 

 ( = Limulida) 

 Limulus; Tachypleus 



( = Pedipalpi) 



Order SCORPIONES (scorpions) 



Scorpio; Apistobuthus ; Buthus; Tityus ; Pandinus 



Order PSEUDOSCORPIONES (false scorpions) 



( = Chelonethi, Chernetes) 



Microbisium; Chelifer; Garypus; Chthonius 



f Order UROPYGI (whip scorpions) 



( = Thelyphonida, Schizomida, Tartaridae) 



Mastigoproctus; Schizomus 



Order AMBLYPYGI 



( = Phrynicida) 



Damon; Phrynichus; Charinus 



Order PALPIGRADI (micro-whip scorpions) 



( = Microthelyphonida) 



Koenenia 



Order RICINULEI 



( = Podogonata) 



Ricinoides 



Order SOLIFUGAE (false spiders, sun spiders, wind 



scorpions) 



( = Solpugida) 



Galeodes 



Order OPILIONES (phalangids, harvest spiders, har- 



vestmen) 



( = Phalangida) 



Phalangium; Oligolophus 



Order ARANEAE (spiders) 



Araneus; { = Epeira); Atrax; Latrodectus; Pholcus 



Order ACARI 



A car us, Dermanyssus, Py emotes, Trombicula 



(mites); Ixodes, Argas, Ornithodoros (ticks) 



Class PYCNOGONroA^ (sea spiders) 



( = Pantopoda) Order COLOSSENDEOMORPHA 



Dodecolopoda; Colossendeis 



' See also Dibranchia, p. 23. 



• These three classes may be considered as members of sub-phylum Chelicerata. 



