Coexistence and possible parasitism of somatic and germ cell lines in chimeras of the colonial urochordate Botryllus schlosseri.
Urochordate whole body regeneration inaugurates a diverse innate immune signaling profile.
BS-Cadhcrin in the colonial urochordate Botryllus schlosseri: one protein, many functions.
Vasa and the germ line lineage in a colonial urochordate. Dev.
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.
Urochordates have become popular model organisms in the effort to deduce information about the common chordate ancestor.
In most larval urochordates the notochord provides a stiff skeletal element for the tail, but it must also be flexible to facilitate swimming and other movements.
In contrast to urochordates, cephalochordates have retained many features of the basal chordate body plan and are likely to approximate the ancestor of both urochordates and vertebrates.
According to recent molecular phylogenies, urochordates are the sister group to the vertebrates (Delsuc et al., 2006).
Conversely, other interactions related to later events in nervous system formation that occur after neural crest induction in vertebrates appear to be conserved between urochordates and vertebrates.
First, while some interspecific comparisons have found a relationship between offspring size and development time in species with non-feeding larvae (e.g., ascidians [2, 12]), others have found no significant relationship in urochordates
or echinoderms (14) (although the number of replicates was low in both groups).