in taxon develops from develops from Chordata Tunicata somite http://upload.wikimedia.org/wikipedia/commons/6/64/Gray19_with_color.png Post-cranial axial segments which form sclerotome and dermomyotome.[AAO] TAO:0000155 Undifferentiated mesodermal components of early trunk or tail segments or metameres, derived from paraxial mesoderm; forms myotomes, sclerotomes and perhaps dermatomes. Kimmel et al, 1995.[TAO] somitus EMAPA:31169 BTO:0001558 MIAA:0000068 AEO:0001015 EHDAA:699 epithelial somite relationship type change: OBO_REL:part_of trunk (TAO:0001115) CHANGED TO: develops_from trunk (UBERON:0002100)[TAO] AAO:0010569 XAO:0000058 EHDAA:366 MESH:D019170 Wikipedia:Somite EDITOR_NOTE currently classified as an epithelial vesicle, consistent with EHDAA2 and https://github.com/obophenotype/uberon/wiki/The-neural-crest. Consider making 'somitic mesoderm' a separate term and correlate with regionalization processes. Consider moving ZFA term to 'trunk somite' as it is part of the trunk somites somitic VHOG:0000191 (...) cephalocordates and craniates belong to a group known as Somitichordata. Somitichordate synapomorphies include (1) somites (...) (reference 1); The idea that the last common ancestor of bilaterian animals (Urbilateria) was segmented has been raised recently on evidence coming from comparative molecular embryology (reference 2).[well established][VHOG] When the somite becomes segmented from the segmental plate, it is composed of an epithelial sac enclosing mesenchymal somitocoel cells. Thereafter the somite differentiates into two parts, the ventro-medial mesenchymal sclerotome and the dorso-lateral epithelial dermomyotome. This change in the epithelial somite depends on surrounding tissue [PMID:15906248] epimere MAT:0000068 ZFA:0000155 NCIT:C34302 UMLS:C0376449 UBERON:0002329 relationship type change: part_of paraxial mesoderm (AAO:0010568) CHANGED TO: develops_from paraxial mesoderm (UBERON:0003077)[AAO] epimere mesoderm EHDAA2:0003436 mesodermal cluster Somites are spheres of epithelial cells that form sequentially along the anterior-posterior axis of the embryo through mesenchymal to epithelial transition of the presomitic mesoderm. somitic mesoderm GAID:1306 FMA:85522 relationship loss: develops_from paraxial mesenchyme (TAO:0000942)[TAO] presomitic mesoderm developing anatomical structure epithelial vesicle