It was lately suggested that cilia inside the pharynx of Gnathostomulida are a novel finding and that Herlyn and Ehlers (Zoomorphology 117:135–145, 1997) did not observe anything corresponding to a buccal ganglion in the pharynx of Gnathostomula paradoxa (Gnathostomulida). However, monociliated pharyngeal receptors were repeatedly reported for Gnathostomulida since the 1980th, and every statement of absent ciliation in the cited study referred to the pharyngeal epithelium excluding the imbedded receptors. Moreover, Herlyn and Ehlers stated that they did not regard the questionable nervous differentiation in the hind pharynx of Gnathostomulida as a buccal ganglion due to lacking evidence of an extra basal lamina sheath. The present study shows that it is also uncertain if the structure fulfills another frequently applied criterion of a ganglion, i.e., an arrangement of perikarya and neuropil in such a manner that the first enclose the latter. Notwithstanding the alternative definitions used, the transmission electron micrographs presented herein also confirm previous findings. Thus, the nervous differentiation in the posterior pharynx (buccal ganglion) gives rise to one weaker dorso-median nerve and two stronger lateral nerves which connect with the distal ciliated portions of the pharyngeal receptors. The single cilium of each receptor extends from the bottom of a pit into the pharyngeal cavity, whereby its proximal section is surrounded by eight microvilli. A survey on the considerable discrepancies between the descriptions of buccal/mastax/pharyngeal ganglia in Gnathostomulida, Micrognathozoa, Monogononta, Bdelloidea, Seisonidea, and Acanthocephala (present/absent, inside/outside the pharynx, ventrally/dorsally in the pharynx, ganglion/plexus, etc.) concludes this study.