specific_to
existence overlaps
existence starts during or after
existence ends during or before
independent continuant
Stage 1
Smed sexual biotype
zygote
PMID:28812561
Planarian_Anatomy
BTO:0000854
https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4971
Diploid cell resulting from the fusion of male and female gametes at fertilization. [The_Dictionary_of_Cell_and_Molecular_Biology:Third_Edition ].
embryo stage