Embryology of Temnocephala novæzealandiæ Haswell

Details Embryology of Temnocephala novæzealandiæ Haswell Embryology of Temnocephala novæzealandiæ Haswell

Dec 1947

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1947natur.160..798h&link_type=abstract

Nature, Volume 160, Issue 4075, pp. 798-799 (1947).

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Scientific paper

THE egg of Temnocephala novæ-zealandiæ consists of a zygote surrounded by polyhedral-shaped yolk cells. First cleavage results in the formation of a macromere and a micromere. The macromere divides into another macromere and a micromere, and after this three-celled stage each cell divides evenly and repeatedly, producing a large number of macromeres and micromeres. These constitute the blastoderm and are centrally situated in the yolk mass, which now is a syncytium (Y). When fully formed, the blastoderm is also syncytial in nature, thus necessitating the description of its component cells as macronuclei (Ma) and micronuclei (Mi). Two germinal layers are recognized. The macronuclei give rise to the æsophagus, intestine, reproductive organs and excretory apparatus and are regarded as belonging to the hypoblast (Hp). The micronuclei give rise to the nervous system, pharynx and body-wall and are regarded as epiblastic (Ep).

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