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Figure 1 | Frontiers in Zoology

Figure 1

From: The hatching larva of the priapulid worm Halicryptus spinulosus

Figure 1

A/B Adults with fully protruded introvert of the priapulid worms Halicryptus spinulosus (A) and Priapulus caudatus (B). Anterior is to the left in both cases. The posterior structure in A (arrow) is excrement, not a caudal appendage as seen in B (asterisk). C Simplified phylogeny of the Priapulida (after [19]). D Embryo of H. spinulosus one day before hatching. View on inner organs like the developing gut is inhibited by large amounts of yolk. Anterior is to the top.

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