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Shipworm

Teredo navalis Linnaeus 1758

cleavage stage

Egg Characteristics and Breeding Season for Woods Hole Species
spiral
URI: http://purl.obolibrary.org/obo/PATO_0000404

Definition: A shape quality inhering in a bearer by virtue of the bearer's being curled or wound (especially in concentric rings or spirals).

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Egg Characteristics and Breeding Season for Woods Hole Species
unequal cleavage
URI: http://eol.org/schema/terms/unequalCleavage

Definition: In unequal cleavage, the first two cell divisions are unequal producing four cells in which one cell is bigger than the other three. This larger cell is specified as the D macromere.

Attribution: https://en.wikipedia.org/wiki/Cleavage_(embryo)

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