Species (29)
- Strongylidium packii
- Strongylidium pseudocrassum
- Strongylidium caudatum
- Strongylidium contortum
- Strongylidium muscorum sensu Foissner
- Strongylidium arenicolus Dragesco 1954
- Strongylidium maritimum
- Strongylidium bacilliforme
- Strongylidium granuliferum Foissner 1987
- Strongylidium martimum
- Strongylidium contorta
- Strongylidium contorta
- Strongylidium coronatum
- Strongylidium microstoma Dragesco & Dragesco-Kernéis 1986
- Strongylidium californicum Kahl 1932
- Strongylidium arenicola Dragesco 1960
- Strongylidium deflectum Tucolesco 1962
- Strongylidium granuliferum Foissner 1987
- Strongylidium crepidatum Wang 1940
- Strongylidium crassum Sterki 1878
- Strongylidium contortus Gelei 1954
- Strongylidium labiatum Kahl 1932
- Strongylidium lanceolatum Kowalewski 1882
- Strongylidium marititum Wang & Nie 1932
- Strongylidium mucicola Kahl 1932
- Strongylidium muscorum Kahl 1932
- Strongylidium packi Calkins 1902
- Strongylidium wilberti Foissner 1982
- Strongylidium polystichum Kahl 1932