Genus Strongylus Müller, 1870
Key to species
| 1 | a. Prominent teeth present in buccal cavity | 2 |
| b. Teeth absent from buccal cavity | S. edentatus | |
| 2 | a. Dorsal and ventral teeth present in buccal cavity; dorsal tooth single with 2 points; 2 ventral teeth pointed and shorter than dorsal tooth | S. equinus |
| b. Only bilobed dorsal tooth present | 3 | |
| 3 | a. Lobes of tooth high, rounded, smooth; extend nearly one-half depth of BC. Excretory pore near nerve ring. Dorsal lobe of copulatory bursa longer than lateral lobes | S. vulgaris |
| b. Lobes of tooth low, flat, grooved; extend less than one-third depth of BC. Excretory pore at level of BC. Dorsal lobe of copulatory bursa equal to or shorter than lateral lobes | S. asini |
© (contents) R.J.
Lichtenfels, V.A. Kharchenko,
G.M. Dvojnos 2003
Design and programming: Yuriy Kuzmin,
2003