Rhodopsis pusilla Bush 1905. a minute species characterized by a chitinous opercular plate bearing numerous spines is redescribed and a neotype is designated.
Apomatolos Uchida. 1978 is synonymized with
Rhodopsis. Ventral fillform mouth-palps are present, a rarely observed character in common with
Pseudovermilia Bush. Variability between and within populations from different seas is discussed.
Rhodopsis pusilla from Heron Island shows opercular dimorphism. Pouch-like brood chambers similar in texture (SEM) to the
Rhodopsis tubes and integrally associated with rings marking successive position of the peristome were found on some tubes. These brood chambers, presumed to belong to
Rhodopsis, are described with conjectures as to their mode of formation. Some aspects of opercular polymorphism in serpulids are discussed.
