| Citation | Breder, C.M. Jr., 1933, The development of the urostyle in Umbra pygmaea (DeKay).. Am. Mus. Novit. 610. 5 p. |
| Ref. | Breder, C.M. Jr., 1933 |
| Page | fig.1,2 |
| Named Used as Valid | Umbra pygmaea |
| Comment | Cited in Ref. 4639. Not actually seen. |
| Locality | |
| Distribution | |
| Quote |