Key to species of the genus Paratyphis Claus, 1879

1. Pereopod 5; ischium inserted sub-terminally on basis; basis without notch on distal margin. Pereopod 6; basis with relatively long fissure, extending above telsonic groove............................................ P. s p inos us Spandl, 1924

- Pereopod 5; ischium inserted terminally on basis; basis with notch on distal margin, anterior to insertion of ischium. Pereopod 6; basis with moderate fissure located just below beginning of telsonic groove..................................... 2

2. Gnathopod 2; carpal process with fine serrations, pointed, extending to about one-third of propodus... P. parvus Claus, 1887

- Gnathopod 2; carpal process without serrations, sometimes with setae, rounded or pointed, sometimes very small, never as long as one-third of propodus............................................................................ 3

3. Gnathopod 2; carpal process very small, angular. Pereopod 5; basis with smooth anterior margin. Pereopod 6; carpus length about 2.0–2.5 x width.............................................................. P. maculatus Claus, 1879

- Gnathopod 2; carpal process rounded, very small, or absent. Pereopod 5; basis with slight undulation mid-way on anterior margin. Pereopod 6; carpus slightly longer than 3 x width................................. P. promontorii Stebbing, 1888