Literature
- Spoel, S. van der and Pafort-van Iersel, G. J. S. 1982. Pneumoderma degraaffi n. sp., a pteropod new to science (Mollusca, Opistobranchia). Bull. zool. Mus. Univ. Amst. 9 (3): 17-20.
- Zhang, F. 1964. The pelagic molluscs off the China coast, 1. A systematic study of Pteropoda (Opisthobranchia), Heteropoda (Prosobranchia) and Janthinidae (Ptenoglossa, Prosobranchia). Stud. Mar. Sinica 5: 125-226.
- Zheng Zhong (et al.) 1989. Marine Planktology. China Ocean Press. Bejing: i-viii, 1-454. [transl. from Chinese orig.].