Definition of "opsiblastic"

Opsiblastic ova with retarded development occur in freshwater forms, although initiation of the process is little understood .

1982, Sybil P. Parker, Synopsis and Classification of Living Organisms - Volume 1, page 857

If an opsiblastic egg is produced by an individual, it is usually the last oviposition by that animal even if it is also the first.

Ellsworth C. Dougherty, The Lower Metazoa (page 474)

Opsiblastic eggs are thick-shelled, a little larger than tachyblastic eggs, and are very resistant to freezing and drying.

2010, James H. Thorp, Alan P. Covich, Ecology and Classification of North American Freshwater Invertebrates, page 167