Stage 11 (Carapace partly covers the legs): (a, b) Sytox; (a‘) Detail of thoracopods artificially colorized; (c) Schematic drawing. (a) Male, ventro-lateral view: the seashell-like halves of the carapace have further extended and cover approximately four fifths of the dorsal side of the embryo, while on the ventral side the legs are partially covered. The bases of the first antennae adjoin each other medially. On each tip two setae are evident. The second antennae elongated and reach the fourth thoracopod. The thoracopods have developed prominent setae. The gills in the lateral area of the thoracopods have increased in size. Due to the growth of the abdomen the proctodeum has shifted even more in anterior direction. (a‘) The second to fourth thoracopods developed prominent setae. A few setae are evident on the fifth thoracopod. (b) Female, ventral view: beside the fused first antennae the females show the same habitus as the males. (c) Schematic drawing of stage 11. a1, a2 = first and second antennae; ab = abdomen; ca = carapace; casp = carapace spine; gi = gill; lb = labrum; md = mandible; ml = midline; mxa = maxillary appendage; pro = proctodeum; thp = thoracopod.