FIGURE 4 in Spionidae (Polychaeta: Canalipalpata: Spionida) from seamounts in the NE Atlantic

FIGURE 4. Rows of holes present on the dorsum of some chaetigers of the branchiate region or adjacent to it (observed with SEM) in Aonidella cf. dayi Maciolek in López-Jamar, 1989: A. Schematic illustration of this character as observed in a single large specimen. B–D. Examples from SEM studies of this character in large specimen: anterior end until chaetiger 7 (B), chaetigers 12–14 (C), left side of chaetiger 13 (D). E. Infraspecific variation of this character based on a SEM study of 7 specimens 0.15–0.35 mm in width. Coding of counts: (number of lateral holes) / number of holes in the anterior row / number of holes in the posterior row.—A–D all from Irving seamount (ZSRO-P2354), E specimens from Irving seamount (SMF 23391, ZSRO-P2354, SMF 23389) and Great Meteor Seamount (ZSRO-P2348, ZMH-P27569, SMF 23380, ZSRO-P2350), Scale: B, C 100 µm, D 50 µm.