Key to Marsipococcus species based on adult female morphology

1. Stigmatic setae close together at the base of each stigmatic cleft (South Africa)..................................... 2

- Stigmatic setae well separated, situated on anterior and posterior margins of each stigmatic cleft (Sri Lanka & Malaysia)... 3

2. Ventral tubular ducts present submedially on abdominal segment VII. Preopercular pores present in a narrow band extending from anterior to anal plates, almost to dorsad to mouthparts. Marginal setae setose................ M. durbanensis (Brain)

- Ventral tubular ducts absent from abdominal segment VII. Preopercular pores present in a widespread group submedially on metathorax and anterior abdominal segments. Marginal setae spinose.............................. M. proteae (Brain)

3. Multilocular disc pores present in a tight group on either side of anal opening. Preopercular pores present in a narrow band extending from anterior to anal plates almost to dorsad to mouthparts (Sri Lanka)................. M. marsupialis (Green)

- Multilocular disc pores absent. Preopercular pores absent (Malaysia).............. M. ulubendulensis Łagowska & Martin