anucleate

Or how can we verify that anucleate cells preceded nucleate cells?

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Interestingly, of all vertebrates only mammals have anucleate RBCs except for one genus of salamander.

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They are born with a nucleus and reproduce when young, before they reach the anucleate adult form.

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Or how can we verify that anucleate cells preceded nucleate cells?

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In anucleate cells there is probably only a single process of layer formation round an infinitely small nucleolus.

Form and Function A Contribution to the History of Animal Morphology

The monerula was the fertilised ovum after the disappearance of the germinal vesicle; [438] it was the equivalent of the primordial anucleate Monera which are the ancestors of all animals.

Form and Function A Contribution to the History of Animal Morphology

The blastoderm of the chick before incubation is found to be composed of spherical anucleate bodies which Schwann considers to be cells, because they almost certainly develop into the cells of the incubated blastoderm, which are clearly recognisable as such after eight hours 'incubation.

Form and Function A Contribution to the History of Animal Morphology

He found that if the similar anucleate "polar lobe" of this form is removed at the two-celled stage, deficient larvæ are formed, in which the post-trochal region and the apical organ are absent.

Form and Function A Contribution to the History of Animal Morphology

Conclusive proof of the importance of the cytoplasm was obtained soon after by Crampton, [502] who removed the anucleate

Form and Function A Contribution to the History of Animal Morphology

I didn’t ask for just-so stories of anucleate cells preceding nucleate.

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