Adisianus

Identification key and distribution of Adisianus View in CoL species

1 Frontal head with pointed and almost smooth spine-like chaetae; manubrium with 6+6 chaetae; dorsal dens with 19 or less chaetae............................................. A. maassius ( Palacios-Vargas & González, 1995) ( Mexico)

- Frontal head with rough blunt chaetae; manubrium with 7+7 or 8+8 chaetae; dorsal dens with 21 or more chaetae......... 2

2 Ant III with two rough blunt chaetae, Ant I lacking such structures; frontal head B line with 1+1 rough blunt chaetae; male with 4+4 genital chaetae...................................................... A. maculatus ( Bretfeld, 2002) ( Brazil)

- Ant I and III with one rough blunt chaeta, each; frontal head B line lacking rough blunt chaetae; male with 6+6 or 7+7 genital chaetae............................................................................................. 3

3 Lateral body strongly pigmented; frontal head lacking unpaired chaetae; tenaculum with two chaetae; manubrium with 8+8 chaetae.................................................................. A. fuscus ( Bretfeld, 2002) ( Brazil)

- Lateral body weakly pigmented; frontal head with one unpaired chaeta; tenaculum with three chaetae; manubrium with 7+7 chaetae....................................................................... A. pinheadi sp. nov. ( Brazil)