Café

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 [[!meta title="pages tagged Ciona"]]
 
 _C. intestinalis_ and _C. savignyi_ can cross-fertilise after removal of the
-vitelline enveloppe ([[Byrd and Lambert, 2000|biblio/10602281]]).
+vitelline enveloppe ([[Byrd and Lambert, 2000|biblio/10602281]]).  They are
+estimated to have diverged 122 ± 33 million years ago ([[Delsuc and coll.,
+2018|biblio/29653534]]).
 
 _Ciona robusta_'s sperm can efficiently fertilise _C. intestinalis_ eggs, but
 the fertilisation rates are much lower in the reciprocal crosses ([[Suzuki,