Chaetozone sp. 4. A ZMBN125798, SEM of anterior end in dorsal view B ZMBN125776, SEM of posterior spines C ZMBN125798, SEM of peristomium epidermis D ZMBN125798, SEM of ciliated organ E ZMBN125776, SEM of neuropodial spine. Abbreviations: br, branchiae; Ch, chaetiger; cO, ciliated organ; dT, dorsal tentacles; nuO, nuchal organ; per, peristomium; pr, prostomium; Seg, segment.