1	Clitellum xiv–xvii; each spermatheca with two diverticula	Lampito mauritii
–	Clitellum xiv–xvi; each spermatheca with a diverticulum	2
2	Copulatory pouches absent	3
–	Copulatory pouches present	5
3	Four pairs of spermathecal pores in 5/6/7/8/9. First dorsal pore in 5/6	A. catenatus
–	Two pairs of spermathecal pores in 7/8/9. First dorsal pore in 12/13	4
4	Male pores located behind the setal ring xviii. Genital markings strongly concave inside body wall in the male region	A. poropapillatus
–	Male pores in the setal ring xviii. Genital markings not concave	A. phuquocensis
5	Genital markings present in the male region	6
–	Genital markings absent in the male region	9
6	Four pairs of spermathecal pores in 5/6/7/8/9. Two pairs of genital markings in xvii and xix. Septum 8/9 thick	M. posthuma
–	Three pairs of spermathecal pores in 6/7/8/9. Two pairs of genital markings in 17/18 and 18/19. Septum 8/9 absent	7
7	Three to four pairs of genital markings in vi–ix. Septum 10/11 absent	M. doiphamon
–	No genital markings in the spermathecal region. Septum 10/11 present	8
8	Genital markings disc-shaped. Male region not concave	M. peguana
–	Genital markings slide-shaped. Male region concave	M. bahli
9	Two pairs of spermathecal pores in 6/7/8 or 7/8/9	10
–	Three pairs of genital markings in 6/7/8/9	11
10	Spermathecal pores in 6/7/8. First dorsal pore in 11/12	M. planata
–	Spermathecal pores in 7/8/9. First dorsal pore in 12/13	M. californica
11	Spermathecal pores located dorsally. First dorsal pore in 12/13	M. dorsobitheca
–	Spermathecal pores located lateroventrally. First dorsal pore in 11/12	M. houlleti