TEM micrographs of Osedax deceptionensis bacteriocytes and endosymbionts a Bacteriocyte (bc) at roots close to ovaria, surrounded by non-symbiotic cells (ns).

Non-symbiotic cells (ns) with abundant rough endoplasmic reticulum (er) and protein droplets (prot); notice sperm (s) occasionally seen close to bacteriocytes (bc). Bacteriocyte (bc) containing bacteria (b) and myelin bodies (my), b Detail of bacteria (b) inside the bacteriocyte showing different stages of degradation, including earlier stages of degradation (dg) and myelin bodies (my) surrounding bacteria, c Detail of bacteria (b) inside the bacteriocyte including a large myelin body (my) resulting from the degradation of several bacteria.