Syllis gracilis Grube, 1840

Syllis gracilis: Monro, 1933: 30; Hartman, 1968: 463, Fig. 1–4; Imajima, 1966a: 248 –250, Fig. 49 a–k; Fauchald & Reiner, 1975: 83; Fauchald, 1977: 20 –21, Fig. 3 b; López et al., 1997: 63; San Martín, 2003: 413–416, Fig. 426–427.

Syllis (Syllis) gracilis: Gardiner, 1976: 139, Fig. 12 l–n; Uebelacker, 1984: 30 –106, Fig. 30–102.

Material examined. 3 specimens (CPICML PO-37-027): 1 specimen, Caleta E1B1, 16°49.797’N, 99°54.062’W, 25 May 2006, 12 m, coarse sand. 2 specimens, Caleta E1B2, 16°49.797’N, 99°54.062’W, 25 May 2006, 12 m, coarse sand.

Comparative material examined. Syllis gracilis, 7 specimens (MNCN 16.01/11416) PANAMA: Coiba island, Chiriqui Gulf, Rosario Beach, 1.2 m. Syllis gracilis, 11 specimens (MNCN 16.01/11412) PANAMA: Coiba island, Ensenada Maria, Chiriqui Gulf, 2 m.

Remarks. The specimens agree well with the original description of the species.

Habitat. Hard bottoms, particularly between algae, sponges and calcareous concretions. Intertidal to 300 m depth (San Martín, 2003).

Distribution. Apparently cosmopolitan, but could be a complex of species.