Family Neelidae Folsom, 1896

Megalothoracidae Börner, 1900

Key to the Genera of the Neelidae

1.	Ant. IV with four short olfactory setae; thoracic sensorial areas rudimentary, without setiferous tubercles or marginal setae; abdominal sensorial areas absent; anterior surface of dens II with one basal decurrent seta and three sub-apical setae; posterior face with three external spines, one central seta, and three sub-apical setae	Neelides Caroli, 1912 (208)
	Ant. IV with single large sensilla; well-developed sensorial areas, with setiferous tubercles and marginal setae present on thorax and abdomen; anterior face of Dens II with three plate-like spines (fanerae) in a transverse sub-apical row	2
2.	Ventral tube with posterior lobe; posterior face of Dens II with three external denticules, one central seta, and two internal denticules; anterior face with one median seta and a strong terminal spiniform process to each side	Neelus Folsom, 1896 (436)
	Ventral tube without posterior lobe; posterior face of Dens II with two external spines, one central seta, and two internal spines; anterior face with three denticles in a transverse sub-apical row	Megalothorax Willem, 1900 (1133) =Amerus Collinge and Shoebotham, 1909 (262)