(CA) and _C. int_ from Woods Hole (MA), but viability was reduced, especially
when maternal or grand-maternal origin was _C. int_.
+Non-read papers related to the _rob_-_int_ speciation: Primary Genetic Linkage
+Maps of the Ascidian, Ciona intestinalis. Shungo Kano, Nori Satoh, Paolo
+Sordino. Zoological Science, 23(1):31-39 (2006).
+https://doi.org/10.2108/zsj.23.31; Symmetrical Reproductive Compatibility of
+Two Species in the Ciona intestinalis (Ascidiacea) Species Complex, a Model for
+Marine Genomics and Developmental Biology. Atsuko Sato, Sebastian M. Shimeld,
+John D. D. Bishop. Zoological Science, 31(6):369-374 (2014).
+https://doi.org/10.2108/zs130249
+
_C. roulei_ can cross-hybridise easily with _C. intestinalis_, suggesting
that they are the same species ([[Malfant, Darras and Viart, 2018|biblio/29367599]]).