part_of part of part of develops_from develops from anatomical entity anatomical entity embryonic structure lateral plate mesoderm intraembryonic coelom The part of the coelom in the embryo between the somatopleuric and splanchnopleuric mesoderm; the principal body cavities of the trunk (thoracic, abdominal, and pelvic) arise from this embryonic part of the coelom. UMLS:C1512940 (...) I regard it unlikely that coeloms of all bilaterian animals are comparable and evolved very early. Considering all these questions, few convincing characters concerning the evolution of body cavities remain to be named. (...) A segmental coelom appears to have evolved at least two times, in Annelida and in Myomerata (Acrania and Craniota).[well established][VHOG] VHOG:0000316 UBERON:0003887 EMAPA:16088 EHDAA:251 consider merging with coelom. TODO - add spatial relationships to halves of LPM. Note the OG places XAO and ZFA coelem terms here. editor note: TODO check ZFA, which appears to be a structure present in adults Wikipedia:Intraembryonic_coelom NCIT:C34195 somatic coelom uberon coelom