part of endocrine system development ring gland development See also the fly_anatomy.ontology terms 'ring gland ; FBbt:00001722, 'prothoracic gland ; FBbt:00001724', 'corpus allatum ; FBbt:00005800' and 'corpus cardiacum ; FBbt:00005799. biological_process Progression of the ring gland over time, from its formation to a mature structure. The ring gland is a neuroendocrine organ found in higher Dipterans, which is composed of the prothoracic gland, the corpus allatum, and the corpora cardiacum. The ring gland is the site of production and release of ecdysteroids and juvenile hormones. GO:0035271 gland development