Fig. 1. Variation of development and growth in juveniles and adolescents. (A,B) Rather synchronous development of lecithotrophic stage-2 juveniles (arrow) from dam A on the maternal pleopods (A) and in net culture (B). Arrowhead in B denotes yolk reserves. Scale bars, 3 mm. (C,D) Size differences among feeding batch-mates removed from brooding dam A at day 35 after hatching: the juvenile in C is in stage 3 whilst its sib in D is already in stage 5. Markers in D denote traits and organs investigated in juveniles: carapace length (black line), total length (white line), outer branch of 1st antenna (arrowhead) bearing the olfactory aesthetascs, and chelae of pereiopods 1, 2 and 3 (arrows) bearing the gustatory corrugated setae. Scale bars, 2 mm. (E) Development of batch-mates (S₁–S₁₂) from dam B₅ raised individually in a 12-well microplate from late embryogenesis to juvenile stage 5 (Juv 5). Development is rather uniform in embryos and non-feeding stages 1 and 2 but becomes heterogeneous after onset of feeding in stage 3. (F) Growth differences of five juveniles from dam B that were size-matched in stage 6 and then cultured in an aquarium without shelter. 34 days later, one specimen was in stage 11, one in stage 9 and three were in stage 7. Scale bar, 4 mm. (G) Temporal development of size variation in eight adolescent batch-mates (B₁–B₈) from dam B reared communally under aquarium conditions. Specimens are numbered according to sequence of egg-laying, which started in B₁ at day 158 after hatching.