[[!meta title="pages tagged Ciona"]]
+
+ - Ciona robusta Hoshino & Tokioka, 1967 [WoRMS ID 252565](http://www.marinespecies.org/aphia.php?p=taxdetails&id=252565)
+ -|
+ - Ciona intestinalis Linnaeus, 1767 [WoRMS ID 103732](http://www.marinespecies.org/aphia.php?p=taxdetails&id=103732)
+
_C. intestinalis_ and _C. savignyi_ can cross-fertilise after removal of the
vitelline enveloppe ([[Byrd and Lambert, 2000|biblio/10602281]]). They are
estimated to have diverged 122 ± 33 million years ago ([[Delsuc and coll.,