Brachyury (T) expression in embryos of a larvacean urochordate, Oikopleura dioica, and the ancestral role of T.
Development of putative GABAergic neurons in the appendicularian urochordate Oikopleura dioica.
Development of the caudal nerve cord, motoneurons, and muscle innervation in the appendicularian urochordate Oikopleura dioica.
Within the urochordates, the correlation coefficient for egg diameter and cell cycle duration was high but not significant with the small sample of three species.
Two of the three urochordates, which swim with muscle, developed to swimming in the same time as species that first swim with cilia.
The trend holds in feeding echinoderms and nonfeeding urochordates (Table 2).
Estimates of cell numbers at first swimming in species with multiciliated cells suggest that they may be intermediate to the echinoderms and urochordates in lengthening later cell cycles (E.
Urochordates appear to invest a large proportion of their development time prior to swimming in processes other than multiplying cells.