Stage Duplication 1 Duplication 2 Duplication 3 Representative developmental events
D T1 T2 T18 Blastocyst stage
E T3 T19 T23 Severe deformation and epibol
F T4 T20 T24 Coelomic cavities formation
G T5 T6 T7 Distinct dorsoventral pattern, anterior-posterior axis
H T8 T9 T21 The organogenesis and refinement of crops, intestine, eyes and posterior sucker
I T10 T11 T12
J T13 T14 T15
L T16 T17 T22 Body surface lines