Embryos of the Penis Worm (IMAGE)

University of Bristol

Embryos of the Penis Worm

Caption

Embryos of the penis worm (Markuelia) from the Cambrian of China and Siberia. Images: a-b: two views of the whole embryo; b-f: successively lower rings of teeth around the mouth; g-j: anus and digestive tract; i-j: spines around the anus.

Credit

Phil Donoghue

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