Table 2. Homologies and abbreviations of pelvic musculature by anatomical muscle group (adapted from Hutchinson, 2001a).
| Muscle | Lepidosauria | Crocodylia | Non-avian Theropoda | Aves |
|---|---|---|---|---|
| Triceps femoris | ||||
| M. iliotibialis (IT)/Mm. iliotibiales cranialis et lateralis (IC+IL) | IT | IT1 | IT1 | IC |
| a | IT2 | IT2 | IL | |
| a | IT3 | IT3 | a | |
| M. ambiens (AMB) | AMB | AMB1+2 | AMB | AMB1+2 |
| M. iliofibularis | ILFB | ILFB | ILFB | ILFB |
| Deep dorsal group | ||||
| M. iliofemoralis (IF)/Mm. iliotrochantericus caudalis et iliofemoralis externus (ITC+IFE) | IF | IF | ITC | ITC |
| a | a | IFE | IFE | |
| M. puboischiofemoralis internus (PIFI)/Mm. iliofemoralis internus (IFI) and iliotrochanterici cranialis et medius (ITCR+ITM) | PIFI1+2 | PIFI1 | PIFI1 | IFI |
| PIFI3 | PIFI2 | PIFI2 | ITCR | |
| a | a | a | ITM | |
| Flexor cruris group | ||||
| M. puboischiotibialis (PIT) | PIT1 | – | – | – |
| PIT2b | PIT | – | – | |
| PIT3b | FTI2 | – | – | |
| M. flexor tibialis internus (FTI)/M. flexor cruris medialis (FCM) | FTI1 | FTI1 | FTI1 | – |
| FTI2 | FTI3 | FTI3 | FCM | |
| a | FTI4b | – | – | |
| M. flexor tibialis externus (FTE)/M. flexor cruris lateralis pars pelvica (FCLP) | FTEb | FTE | FTE | FCLP |
| M. pubotibialis (PUT) | PUT | – | – | – |
| M. adductor femoris (ADD)/Mm. puboischiofemorales medialis et lateralis (PIFM+PIFL) | ADD | ADD1 | ADD1 | PIFM |
| a | ADD2 | ADD2 | PIFL | |
| M. puboischiofemoralis externus (PIFE)/Mm. obturatorii lateralis et medialis (OL+OM) | PIFE | PIFE1 | PIFE1 | OL |
| a | PIFE2 | PIFE2 | OM | |
| a | PIFE3 | PIFE3 | – | |
| M. ischiotrochantericus (ISTR)/M. ischiofemoralis (ISF) | ISTR | ISTR | ISTR | ISF |
| M. caudofemoralis brevis (CFB)/M. caudofemoralis pars pelvica (CFP) | CFB | CFB | CFB | CFP |
Notes.
–
absent.
a
undivided.
b
origin located on soft tissue, not directly on pelvis.