(1) FREY, D.G. 1965. Differentiation of Alona costata Sars from two related species (Cladocera, Chydoridae). Crustaceana. 8: 159-173.
(2) FREY, D.G. 1969. Further notes on Alona bicolor Frey, 1965 (Cladocera, Chydoridae), with a description of the male. Trans. Amer. Microsc. Soc. 88: 380-386.
|