Myrianida convoluta (Cognetti, 1953)

Linero-Arana, Ildefonso & Diaz Diaz, Oscarn, 2011, Syllidae (Annelida, Polychaeta) from the Caribbean coast of Venezuela, ZooKeys 117, pp. 1-28 : 13

Myrianida convoluta (Cognetti, 1953) Figs 4.11-4.12

Autolytus convolutus Cognetti 1953:323-332, figs 1 –12.–1957:71– 72, fig. 15 A–B.– Ben-Eliahu 1972: 217-218, fig. 14 A–D.– Amaral and Nonato 1975: 235 –236.– Ben-Eliahu 1977: 85-86, fig. 12.- San Martín 1994:271.

Autolytus (Regulatus) convolutus Imajima 1966:47-49, fig. 12 A–H.

Autolytus convolutus San Martín 2003:483-486, figs 265-266.

Myrianida convoluta Nygren 2004:125-126, fig. 60 A–D.

Material examined.

GCPG198, (2), on artificial substrate (PVC pipe), 1 m depth; BMC101, (1), inside dead Millepora alcicornis , 1-2 m depth.

Description.

Length to 2.6 mm,width 0.2 mm. Body slender with up to 14 chaetigers, without stolons. Prostomium with a pair of anterior eyespots and two posterior pairs of lentigerous eyes in trapezoidal arrangement. Median antenna longer than lateral ones. Palps fused. Nuchal organs extending to chaetiger 2. Dorsal tentacular cirri as long as lateral antennae; ventral ones shorter. Dorsal cirri of chaetiger 1 as long as median antenna, remaining dorsal cirri short, digitiform. Compound bidentate chaetae with short serrated blades, with small distal tooth and broad subdistal one (Fig. 4.11). Slender bayonet chaetae from chaetiger 4-11 (Fig. 4.12). Pharynx with many circumvolutions. Trepan with 9 equal teeth. Proventriculus in chaetigers 8-10 with 19-20 rows of muscle cells. Pygidium with a pair of anal cirri.

Distribution.

North Pacific, Suez Canal, Japan, North Atlantic, Mediterranean, Great Caribbean.