Zoolog Sci. 2005 May;22(5):511-6 doi:10.2108/zsj.22.511

Shoguchi E, Kawashima T, Nishida-Umehara C, Matsuda Y, Satoh N.

Molecular cytogenetic characterization of Ciona intestinalis chromosomes.

Ciona intestinalis has 10 metacentric pairs and 8 submetacentric or subtelomeric pairs of chromosomes.