Hydroides brachyacanthus Rioja, 1941

Bastida-Zavala, J. Rolando, 2008, Serpulids (Annelida: Polychaeta) from the Eastern Pacific, including a brief mention of Hawaiian serpulids, Zootaxa 1722, pp. 1-61 : 22-23

Hydroides brachyacanthus Rioja, 1941

( Figure 6C)

Hydroides brachyacantha Rioja, 1941: 169–172 , pl. 3, fig. 2, pl. 4, figs. 1–9. Type locality: Mazatlan (Sinaloa) and Acapulco (Guerrero), Mexico (type specimens lost).

Hydroides brachyacanthus .— Bastida-Zavala and ten Hove, 2003b: 73–76, figs. 3A–M, 7A–F (revision of the genus from Eastern Pacific).

Material examined. Seventy-eight specimens: Baja California Sur ( Mexico), UMAR-Poly 52, 2 spec. (23º24–25’N, 109º25’W, Cabo Pulmo Reef , Coral Los Frailes, on dead coral Pocillopora , 4 m, Sept. 25, 1988, coll. PH, JK & JRBZ). Guerrero ( Mexico), SV-pc, 50+ spec. (16º50’33”N, 99º54’39”W, Punta Manzanillo, Acapulco, Aug. 20, 1988, coll. SISV); UMAR-Poly 53 (16º50’N, 99º54’W, La Quebrada, Acapulco, on Muricanthus and Spondylus , May 25, 2000, coll. SISV, PSS & JRBZ). Oaxaca ( Mexico), UMAR-Poly 54 (15º45’45”N, 96º07’12”W, Chahue marina, Huatulco, 0 m, May 22, 2000, coll. SISV, PSS & JRBZ); UMAR- Poly 55, 5 spec. (15º40’54”N, 96º27’55”W, La Boquilla, Puerto Angel, on bivalves shells, 6–10 m, Nov. 2003, coll. SS); UMAR-Poly 56, 4 spec. (15º40’04”N, 96º28’53”W, Estacahuite beach, Puerto Angel, on coral debris, 2 m, Oct. 22, 2003, coll. JRBZ); UMAR-Poly 57, 10 spec. (15º45’12”N, 96º07’46”W, Santa Cruz bay, Huatulco, on pier pilots, 0–1 m, Nov. 12, 2003, coll. PZ); UMAR-Poly 58 (15º41’14”N, 96º26’32”W, La Tijera beach, Puerto Angel, on coral Pocillopora , May or June, 2004, coll. G. Velásquez); UMAR-Poly 59, 4 spec. (15º51’N, 97º04’W, Puerto Escondido, on Spondylus calcifer , M12, M23, 6– 10 m, July 4, 2004, coll. SS) .

Diagnosis. For a revised description see Bastida-Zavala and ten Hove (2003b).

Habitat. Depth: Intertidal to 10 m. On rock and sand bottoms, on dead coral ( Pocillopora verrucosa ) and on spiny oyster Spondylus calcifer .

Distribution. Temperate and Tropical Eastern Pacific. Southern California ( USA) to Ecuador; questionably circum (sub) tropical ( Bastida-Zavala & ten Hove 2003b).

Remarks. This species belongs to a world-wide species complex, whose revision is pending. The material from Hawaii is slightly different to the American Pacific specimens with respect to the shape of the spines of the opercular verticil ( Bastida-Zavala & ten Hove 2003a).