Definition of pseudogastrula in English:

pseudogastrula

noun

Zoology
rare
  • A blastula which has undergone invagination prior to gastrulation; specifically (in certain calcareous sponges) one in which the archaeocytes of one hemisphere have become completely enclosed by flagellated cells of the other (before half of these lose their flagella to produce the amphiblastula).

Origin

Late 19th century; earliest use found in American Naturalist.