Syllis armillaris ( Mueller , 1771)

Linero-Arana, Ildefonso & Diaz Diaz, Oscarn, 2011, Syllidae (Annelida, Polychaeta) from the Caribbean coast of Venezuela, ZooKeys 117, pp. 1-28 : 11

Syllis armillaris ( Mueller, 1771) Figs 3.13-3.14

Nereis armillaris Müller 1771 in Müller 1776:217. Syllis (Typosyllis) armillaris Fauvel 1923:264, fig. 99 a–f.– Day 1967:249, fig. 12.4. a–d.– Uebelacker 1984:129-131, 122 a–g.

Syllis armillaris San Martín 2003:423-426, figs. 232-233.

Material examined.

BMIL197, (2); BMIL602, (9), associated with Aplysina fistularis , 1-3 m depth; BMIL197, (4); BMIL397 (6), associated with Ircinia felix , 1-2 m depth.

Description.

Length to 11.5 mm,width 0.62 mm. Body with up to 121 chaetigers. Prostomium with a pair of anterior eyespots and two pairs of lentigerous eyes in trapezoidal arrangement. Median antenna with 9-19 articles, lateral antennae with 11-13 articles. Palps fused basally. Dorsal tentacular cirri with 11-16 articles, ventral ones with 9-15 articles. Dorsal cirri alternating in anterior segments longer, with 12-16 articles, and shorter, with 8-10 articles, becoming shorter in middle and posterior regions. Slender, bidentate dorsal simple chaeta (Fig. 3.13) only present on posterior chaetigers. Compound falcigers bidentate in anterior (Fig. 3.14) and posterior chaetigers, unidentate or subbidentate in midbody region. Simple ventral chaeta bidentate only present on posterior chaetigers. Pharynx extending through 8-9 chaetigers, with 10 marginal papillae encircling middorsal tooth. Proventriculus extending through 6 chaetigers, with 36-44 rows of muscle cells. Pygidium with a pair of anal cirri with 14-18 articles and slender midventral cirrus.

Distribution.

Cosmopolitan.