Key to species of Torbenella

1. Second abdominal somite unarmed .................................................................................................. 2

– Second abdominal somite with 2 median spines on anterior ridge .................................................. 4

2. Thoracic sternite 3 wide, more than 3 times as wide as long. Posterior ridge of abdominal somite 4 unarmed. Anterolateral spine of carapace short, not reaching sinus between rostral and supracocular spines .................................................................................................. T. calvata (Macpherson, 2006)

– Thoracic sternite 3 narrow, less than 3 times as wide as long. Posterior ridge of abdominal somite 4 usually with small median spine. Anterolateral spine of carapace well developed, barely reaching sinus between rostral and supracocular spines ................................................................................. 3

3. Some transverse ridges of carapace uninterrupted. Abdominal somites 2–3 each with 3 transverse ridges in addition to anterior ridge .................................................................... T. aequabilis sp. nov.

– All transverse ridges of carapace laterally or medially interrupted. Abdominal somites 2–3 each with 1 or 2 transverse ridges in addition to anterior ridge ............................................. T. crateris sp. nov.

4. Antennal article 2 with distomesial spine strong, overreaching midlength of article 4. P2–4 dactyli armed with row of spinules on proximal two-thirds of flexor margin ................................................ ............................................................................................................ T. insolita (Macpherson, 2004)

– Antennal article 2 with distomesial spine of moderate size, reaching midlength of article 3. P2–4 dactyli unarmed or with a few spinules on proximal half of flexor margin ...................................... 5

5. Thoracic sternite 3 wide, more than 3 times as wide as long. Posterior ridge of abdominal somite 4 unarmed ................................................................................................................. T. mensae sp. nov.

– Thoracic sternite 3 moderately wide, less than 3 times as wide as long. Posterior ridge of abdominal somite 4 usually with small median spine ....................................................................................... 6

6. P2–4 dactyli slender, 7.5 times as long as wide; flexor margin unarmed ......... T. orbis (Baba, 2005)

– P2–4 dactyli moderately slender, 5.5 times as long as wide; flexor margin with a few spinules on proximal half ................................................................................................................ T. lupi sp. nov.