Syllis amica Quatrefages, 1865

Linero-Arana, Ildefonso & Diaz Diaz, Oscarn, 2011, Syllidae (Annelida, Polychaeta) from the Caribbean coast of Venezuela, ZooKeys 117, pp. 1-28 : 10-11

Syllis amica Quatrefages, 1865 Figs 3.10-3.12

Syllis (Typosyllis) amica Uebelacker 1984:127-129, fig. 120 a–e.

Syllis amica Fauvel 1923:258-259, fig. 95 e–n.– San Martín 2003:366-370, figs. 199-200.

Material examined.

GCPG198, (15), fine sand, 1 m depth; PAPC106, (2), coarse sand, 2 m depth; GCLB205, (6), fine sand, 1 m depth; (8), GCLB205, coarse sand near Thalassia testudinum bed, 0.5-1.3 m depth; BMC101, (4), medium sand, 1 m depth; BMLV101, (28), inside dead Millepora alcicornis , 1-2 m depth; BMIL297, (11); BMIL498, (6), associated with Aplysina fistularis , 1-3 m depth; BMPL297, (15); BMPL398, (8), associated with Ircinia felix , 1-2 m depth; BMIL397, (34), associated with Chondrila nucula , 1-2 m depth.

Description.

Length to 22.6 mm,width 0.2 mm. Body with up to 125 chaetigers. Prostomium with two pairs of lentigerous eyes. Median antenna with 15-20 articles, lateral antennae with 12-19 articles. Dorsal tentacular cirri with 16-21 articles, ventral ones with 9-12 articles. Dorsal cirri of chaetiger 1 longer than remaining, with 19-22 articles. Dorsal cirri alternating longer, with 19-22 articles, and shorter, with 15-18 articles in middle region. Compound falcigers unidentate, coarsely serrated (Fig. 3.10). Dorsal chaeta in middle and posterior regions, simple due to loss of blade (Fig. 3.11). Dorsal and ventral simple chaetae of posterior region, slender, bidentate and minutely serrated. Acicula distally enlarged (Fig. 3.12). Pharynx extending through 6-8 chaetigers, with middorsal anterior tooth. Proventriculus extending through 4-5 chaetigers, with about 40 rows of muscle cells. Pygidium with a pair of anal cirri moniliform and digitiform, short cirrus.

Distribution.

Cosmopolitan in temperate and tropical seas.