Clymenura sp. 3
Voucher specimen. SEA LION: station 11MFB.
Diagnosis. Voucher is a small sized, incomplete specimen; 14mm long and 0.6mm wide for 11 chaetigers long fragment; preserved specimen light pink in colour. Chaetigers 1-9 relatively short (but longer than wide) and distinctly separated by deep intersegmental grooves; chaetigers 10 and 11 elongated, rest of the fragment too damaged. Chaetiger 8 with a distinct semi-circular glandular pad on dorsum as typical for this genus, pad is almost short (less than half of the chaetiger 8).
Prostomium with cephalic plaque; cephalic rim extremely low; without any notches or dips near mid-anterior peak, palpode not developed. Nuchal organs straight, slightly diverging anteriorly, extending throughout 3/4 of length of cephalic plaque, bordering a very low lying cephalic keel, which extends throughout the length of the cephalic plaque.
Notochaetae capillaries of two types – long, smooth, very narrowly limbate chaetae and shorter, very thin capillaries. In chaetigers 1 -3 single stout, amber colour spine observed; from chaetiger 4 rostrate uncini arranged in single row, up to 30 per ramus in mid segments, with manubrial constriction on its shaft, barbells not observed. Posterior end and pygidium not observed. Tube not observed.
Remarks. Although specimen is incomplete, the characteristic pad on chaetiger 8 was observed. Even in the absence of posterior end, this species of Clymenura can be distinguished from other three morphospecies recorded in this study from Falkland Islands by its extremely low rim of cephalic plaque. Currently this specimen is assigned to morphospecies Clymenura sp. 3.
