Key to species of Trabutina Marchal

1 With more than 50 filamentous setae surrounding anal ring; conical setae without a narrowed base. Unusually large oral collar ducts present on venter of anterior thorax and head. Without lobular swellings near vulva.................................................................................................... mannipara (Hemprich and Ehrenberg)

- With less than 40 filamentous setae surrounding anal ring; conical setae with a narrowed base; unusually large oral collar ducts absent from venter of anterior thorax and head; with a lobular swelling near vulva.................................. 2

2. Ventral multilocular disc pores abundant on thorax; tarsus 62−82 µm long; forming a rubbery ovisac.................................................................................................... crassispinosa Borchsenius

- Ventral multilocular disc pores usually absent from thorax; if present, with fewer than 10 pores. Tarsus 37−64 µm long. Forming a filamentous ovisac.................................................................. serpentina (Green)