Figure 1

B. longimanus females carry their embryos in a dorsal brood pouch until they release them as juveniles. A Schematic drawing of a female of B. longimanus carrying embryos in its dorsal brood pouch (bpch). The degree of pigmentation of the embryonic compound eyes (cee) is visible through the cuticle of the brood pouch. From late gastrulation on the embryos increase in size, and depending on how many embryos the brood pouch is carrying, it can eventually swell up to several millimeters. B Female with its two hatched juveniles (juv I, II) still attached with their caudal processes wrapped around the caudal process of the mother. The regenerated brood pouch with new eggs is already visible (white arrow). Animals fixed in Bouin. C Brood pouch containing eggs that have just been released. The pumping heart (h) causes a movement of the early eggs (e) in the liquid within the brood pouch (bpch). ce - compound eye (adult), do - dorsal organ, Nähb – Nährboden (=nurturing tissue), scale bar - 1 mm.