Character;"Megalothorax Willem, 1900";"Neelides Caroli, 1912";"Neelus Folsom,1896";"Zelandothorax Delamare Deboutteville & Massoud, 1963";"Acanthoneelidus Bretfeld & Griegel 2006";"Spinaethorax gen. n." "Sensory fields";yes;no;yes;yes;yes;yes "Ant. III/IV fused";yes;no;no;yes;no;yes "Retinaculum teeth";"3+3 or 4+4";2+2;3+3;4+4;4+4;3+3 "Neosminthuroid chaetae at the base of Abd. IV sternite";2+2;"4+4 or 5+5";1+1;2+2;1+1;1+1 "Dental proximal setae (dp)";1;1;2;1;1;2 "Nr. of setae on basomedian field of labium";"3+3 or 4+4";2+2;4+4;-;-;6+6 "E3 spine/chaeta on distal part of dens (dd)";no;yes;yes;no;no;no "Nr. of setae around Abd. sf";5;"absent sf";2;-;5;3