Fig. 1

Light microscopic pictures of different life stages of Dinophilus gyrociliatus and D. taeniatus. Stages are indicated by silhouettes (D. gyrociliatus in white and D. taeniatus in orange), and the assignment to the respective stage next to them. Double-arrows indicate the antero-posterior axis (a-p) in the animals at prehatching stage. a-e Dinophilus gyrociliatus, a adult female, dorsal view, b dorsal view of an adult dwarf male, c cocoon with female embryos and dwarf males at 2 days after deposition, d cocoon with females and one dwarf male at 5 days after deposition (prehatching embryos), e early juvenile female, dorsolateral view, f-h D. taeniatus, f copulating male (on the left side) and female (on the right side), dorsal view, g encysted worm, h female next to a cocoon with eight eggs in dorso-lateral view, i-l embryogenesis, i two blastomere-stage with the apical pole up, j morula stage, k postgastrulation stage in ventral view, l prehatching embryo curling inside fertilization envelope with its anterior end up, m juvenile in dorsal view. Abbreviations: avcf – anteroventral ciliary field, bl – blastomere, c – cyst, cb - ciliary band, cch – compound cilia of the head, co – copulatory organ, coc – cocoon, dm – dwarf male, en – fertilization envelope, hg – hindgut, mam – macromere, mim – micromere, mo – mouth opening, np – neuropil, pcb – prostomial ciliary bands, phb – pharyngeal bulb, pro - prostomium, pyg – pygidium, s – sperm, sto – stomach, y – yolk