Syllis gracilis Grube, 1840

Salcedo, Diana L. & Solís-Weiss, Guillermo San Martín And Vivianne, 2012, The genus Syllis (Polychaeta: Syllidae: Syllinae) in the southern Mexican Pacific, with the description of two new species and three new records, Zootaxa 3263, pp. 47-62 : 50

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.

Figures

FIGURE 1. Syllis antoniae n. sp. (A) Anterior end, dorsal view. (B) Anterior chaetae. (C) Anterior aciculae. Scale 40 µm.

FIGURE 2. SEM of Syllis antoniae n. sp. (A) Anterior end, dorsal view. (B) Detail of dorsum (pores). (C) Superior chaetae, anterior chaetiger. (D) Median and most inferior chaetae, anterior chaetiger. (E) Dorsal simple chaeta. (F) Ventral simple chaeta. Scale: (A) 50 µm. (B, D) 10 µm. (C, E – F) 5 µm.

FIGURE 3. Syllis antoniae n. sp. (A) Midbody chaetae. (B) Midbody aciculae. (C) Posterior chaetae. (D) Posterior aciculae. (E) Dorsal simple chaeta. (F) Ventral simple chaeta.

FIGURE 4. Syllis deleoni n. sp. (A) Anterior end, dorsal view. (B) Anterior chaetae. (C) Anterior aciculae. Scale 40 µm.