Hydroides similis ( Treadwell, 1929 )

Bastida-Zavala, J. Rolando, Buelna, Alondra Sofía Rodríguez, León-González, Jesús Angel De, Camacho-Cruz, Karla Andrea & Carmona, Isabel, 2016, New records of sabellids and serpulids (Polychaeta: Sabellidae, Serpulidae) from the Tropical Eastern Pacific, Zootaxa 4184 (3), pp. 401-457 : 427

Hydroides similis ( Treadwell, 1929)

( Figures 6 , 12 F)

Eupomatus similis Treadwell, 1929: 11 –12, Fig. 31. Type locality: Baja California, México.

Hydroides brachyacanthus (not Rioja, 1941).— Bastida-Zavala 1993: 35 (Caimancito Beach, Baja California Sur); Bastida- Zavala 1995: 24 (Cabo Pulmo Reef, Baja California Sur, on coral; 4–17 m).

Eupomatus similis .— Salazar-Vallejo 1989b: 199 (Mexican coasts, checklist); Hernández-Alcántara et al. 2008: 48 (mentioned only).

Hydroides similis .—Bastida-Zavala & ten Hove 2003: 102–104, Figs 21A–U (Baja California, Baja California Sur , Revillagigedo Islands , Costa Rica and Panamá; 0–18 m) ; Salazar-Vallejo & Londoño-Mesa 2004: 55 (Tropical Eastern Pacific, checklist); Bastida-Zavala 2008: 29, fig. 6S (Baja California Sur, on Eucidaris thouarsii spines; 3 m); Bastida- Zavala 2009: 536, Fig. 3 C (identification key for Tropical America); ten Hove & Kupriyanova 2009: 54 (worldwide serpulid checklist).

Material examined. 84 specimens.

Sonora: UMAR-Poly 783, 3 spec. (Puerto Peñasco, no more data, coll. SSV et al.).

Baja California Sur: UANL 7892, 6 spec. ( Marina Santa Rosalía , sta. 1, 27°20’25.2”N, 112°15’56.1”W, February 12, 2013, coll. JAL & JMC) ; UANL 7885 ( Marina Loreto, sta. 2: 26°00’54.9’N, 111°20’21”W, April 20, 2010, coll. JAL) ; UANL 7887, 5 spec. ( Puerto Escondido , sta. 2: 25°48’53.1”N, 111°18’40.5”W, April 2, 2011, coll. JAL & ARB) ; UANL 7886, 23 spec. ( Marina Cantamar, Pichilingue, sta. 1: 24°16’42.7”W, 110°19’50.4”W, April 22, 2010, coll. JAL); UANL 7889, 35 spec. (same, April 3, 2011, coll. JAL & ARB); UANL 7888, 2 spec. ( Marina Palmira, La Paz , 24°11’05.3”N, 110°18’12.8”W, April 3, 2011, coll. JAL & ARB) ; UANL 7890, 3 spec. ( Marina de La Paz , sta. 1: 24°09’17.7”N, 110°19’32.3”W, April 3, 2011, coll. JAL & ARB) ; UANL 7891 (same, sta. 2: 24°09’17.6”N, 110°19’32.2”W, April 3, 2011, coll. JAL & ARB); UANL 7892 ( Marina Fonatur, La Paz , 24°07’29.7”N, 110°20’47.1”W, November 14, 2013, coll. JAL & JMC); UMAR-Poly 784 (Espíritu Santo-La Partida Islands , La Paz Bay, 5 m, on sponge Aplysina fistularis , sta. 0590-B, April 20, 1990, coll. MBL); UMAR- Poly 785, 2 spec. (La Paz Bay, El Caimancito Beach, April 20, 1988, coll. RBZ); UMAR-Poly 786 (Coral Los Frailes, sta. 989-3, September 18, 1989, coll. MPHC, JKM & RBZ).

Habitat. Intertidal to subtidal (18 m, Bastida-Zavala & ten Hove 2003). On corals, sponges and on anthropogenic substrates in marinas (from Pichilingue, La Paz and Puerto Escondido, Baja California Sur). Also on dead corals, in rock pools and on spines of sea urchin Eucidaris thouarsii ( Bastida-Zavala 1995; Bastida-Zavala & ten Hove 2003; Bastida-Zavala 2008). Fouling species.

Distribution. Tropical Eastern Pacific. Baja California and Sonora ( México) to Panamá (Bastida-Zavala & ten Hove 2003).

Remarks. Hydroides similis is a very common serpulid in the Gulf coast of Baja California Peninsula. The southern records from Socorro Island, Pacific of Costa Rica and Panamá (Bastida-Zavala & ten Hove 2003) are possibly incidental introductions. It is a fouling species with potential to be introduced in other tropical regions by vessels.

Figures

FIGURE 3. Distribution of Ficopomatus uschakovi, Crucigera websteri, Hydroides cf. amri, H. brachyacantha and H. crucigera.

FIGURE 6. Distribution of Hydroides panamensis, H. sanctaecrucis, H. similis and H. trompi.

FIGURE 12. Serpulids in the Mexican Pacific. A. Hydroides inermis, operculum; B – C. H. ochotereana, operculum and spine; D. H. panamensis, operculum; E. H. sanctaecrucis, operculum; F. H. similis, operculum; G. H. trompi, operculum; H. Pomatostegus kroyeri, operculum.