Mörch, 1863 : 378 Rioja 1958 : 262 Hydroides sanctaecrucis Marina Palmira, Topolobampo Marina Fonatur, Guaymas Marina La Paz Hydroides santaecrusis Eupomatus sanctaecrucis Salazar-Vallejo & Londoño-Mesa 2004 : 54 New records of sabellids and serpulids (Polychaeta: Sabellidae, Serpulidae) from the Tropical Eastern Pacific Bastida-Zavala, J. Rolando Buelna, Alondra Sofía Rodríguez León-González, Jesús Angel De Camacho-Cruz, Karla Andrea Carmona, Isabel Zootaxa 2016 4184 3 401 457 6MJND Kroyer Kroyer [151,544,151,178] Polychaeta Serpulidae Hydroides Animalia Sabellida 25 426 Annelida species sanctaecrucis     Hydroides (Eucarphus)sanctae-crucisKrøyer [in]  Mörch, 1863: 378–379, pl. 11, Fig. 12. Type locality: Saint Croix, Caribbean Sea.    Eupomatus sanctae crucis.—  Rioja 1958: 262–264 (Verde Island and Santiaguillo Island, Veracruz).     Hydroides sanctaecrucis.—  Long1974: 28 ( Oahu, Hawaii,  15 m, with little coverage on test panels); Bastida-Zavala & ten Hove2002: 148–151 (first record from the Pacific coast of Panamá;  5 m); Bastida-Zavala & ten Hove2003: 101–102, Figs19P–Q ( Oaxacaand Panamá;  0–1 m);   Salazar-Vallejo& Londoño-Mesa2004: 54 (Tropical EasternPacific, checklist);  Cohen2006: 167 (possible introductions from the Atlanticto the Pacificvia of the PanamáCanal);  Lewis et al. 2006: 666– 669 (establishment in northern Australiaand Singapore);  Okolodkov et al. 2007: 40 (exotic in the Mexican Pacific); Bastida-Zavala2008: 29, fig. 6R ( Oaxaca;  0–1 m);  Bastida-Zavala2009: 535–536,  Fig.3B (identification key for Tropical America); ten Hove& Kupriyanova 2009: 54 (worldwide serpulid checklist); Tovar-Hernández et al. 2012: 18–19 (  La Paz, Baja  CaliforniaSur, Guaymas, Sonora, and Topolobampo, Sinaloa);  Bastida-Zavala et al. 2013: 349 ( Oaxaca, checklist); Bastida-Zavala et al. 2014: 326–327, Fig.19.1i (exotic in the Mexican Pacific);  Tovar-Hernández et al. 2014: 390 ( Marina Palmira, Topolobampo, Sinaloa; Marina Fonatur, Guaymas, Sonora; and Marina La Paz, Baja  CaliforniaSur); Villalobos-Guerrero et al. 2014: 107 ( Sinaloa, checklist); Sun et al. 2015: 76–79, fig. 25 (  NorthernTerritoryand Queensland, Australia; intertidal to  1 m; on rocks, fouling of ship’s hulls and other man-made structures).   Hydroides santaecrusis( sic): Dueñas 1981: 99–100, fig. 29A–F (Albornoz, Cartagena Bay, Colombia; on mangrove roots); Quirós-Rodríguez et al. 2013: 91, Table 3 (Córdoba, Colombian Caribbean; on red algae, intertidal).    Eupomatus sanctaecrucis.—  Salazar-Vallejo & Londoño-Mesa 2004: 54(Tropical EasternPacific, checklist).   Material examined.71 specimens.    Sonora:  UANL7883, 2spec. ( Marina Real, Puerto San Carlos, 27°56’41.7”N, 111°05’35.6”W,  July 7, 2011, coll. JAL & ALE).     Baja  CaliforniaSur:  UANL7882, 42spec. ( Marina Fonatur, La Paz, 24°07’29.7”N, 110°20’47.1”W,  November 14, 2013);   UANL7881( Marina Puerto Los Cabos, San Josédel Cabo, sta. 1, 23°03’42.4”N, 109°40’27.8”W,  April 4, 2011, coll. ARB& JAL);   UANL7880, 2spec. ( Marina CaboSan Lucas, sta. 1: 22°53’09.1”N, 109°54’38.4”W,  April 22, 2010, coll. ARB& JAL).    Oaxaca:UMAR-Poly 780, 4 spec. ( Salina Cruz, angler pier, main dock, sta.  4, 1 m,  May 26, 2011, coll. SGM et al.); UMAR-Poly 781, 10 spec. (same, hull of the shrimp boat “ Golfo Pérsico”,  1 m,  May 26, 2011, coll. EVP); UMAR-Poly 782, 10 spec. ( LagunaInferior, San Dionisiodel Mar, 16°18’8”N, 94°44’56”W, 0.5 m, salinity= 30.77 PSU,  August 30, 2014, coll. CPR).   Habitat.Intertidal to subtidal (  5 m, Bastida-Zavala & ten Hove2002). Onanthropogenic substrates in marinas and ports (from CaboSan Lucas and San Josédel Cabo, Baja  CaliforniaSur; Puerto San Carlos, Sonora; and Salina Cruz, Oaxaca). Onrocks, floats and piers, salinity range 19–37 PSU(Bastida-Zavala & ten Hove2003). Foulingspecies.   Distribution.Caribbean Sea, Gulf of  Mexico, from Eastern Floridato French Guyana. As exotic species in the Pacific side of  Panamá(Bastida-Zavala & ten Hove 2002), Oaxaca(Bastida-Zavala & ten Hove 2003), Gulf of California(Tovar-Hernández et al. 2012), Hawaii( Long 1974), northern Australiaand Singapore( Lewis et al. 2006).    Remarks.The first record of  Hydroides sanctaecrucisin the Tropical Eastern Pacificwas from Panamá, specimens collected in 1972 (Bastida-Zavala & ten Hove2002); previously, the species was reported from Oahu,  Hawaii, collected  1968–1972( Long 1974). The species was recorded from Oaxaca, collected in 2000 (Bastida- Zavala & ten Hove2003); from Northern Australia, collected between  1998 and 2001; from Singapore, sampled 2002 ( Lewis et al. 2006), moreover, these authors suspect that  H.cf. uncinata, as recorded by Sun & Yang (2000, Figs 7J-L)from the China Sea, might be  H. sanctaecrucis; and from Darwin,   NorthernTerritoryof Australiain 2014 (Sun et al. 2015). Recently, the species was recorded from several localities in the Gulf of California(Tovar- Hernández et al. 2012). In Northern Australia and Singapore  Hydroides sanctaecrucisis an invasive species which reaches high abundances in several areas ( Lewis et al. 2006). Although the species has been present in Oaxaca and Los Cabos marinas for several years, its abundance is not very high, approximately 25–50 specimens/m2.  Lakshmana Rao (1969: 9, Plate 6, Figs A–H) described  Hydroides vizagensis Lakshmana Rao, 1969from Visakhapatnam, northeastern of India; however, the description and the figure of the operculum correspond to the  H. sanctaecrucisdescription (opinion shared with Lena Kupriyanova and Harry ten Hove, pers. comm. 2016). Would need revise the type specimens (deposited in Andhra University, India) for confirm that suspicion. 1324654230 Long & ten Hove Panama 15 Oahu Hawaii 25 426 1 1324654244 ten Hove & Figs Panama 5 Oaxaca 25 426 1 1324654229 Salazar-Vallejo & Londono-Mesa & Cohen & Lewis & Okolodkov & Bastida-Zavala Panama Mexican Pacific 5 Atlantic northern Australia 25 426 1 Eastern 1324654245 Bastida-Zavala & Fig. & ten Hove & Tovar-Hernandez & La Paz & Villalobos-Guerrero & Sun Australia Sinaloa 1 Tropical America Baja California Sur 25 426 1 California Sur 1324654240 2011-07-07 UANL 27.944916 Sonora 1 -111.09322 25 426 UANL 7883, 2 1 Sonora 1324654242 2013-11-14 UANL 24.124916 Baja California Sur 1 -110.34642 25 426 UANL 7882, 42 1 Baja California Sur 1324654209 2011-04-04 UANL, ARB 23.061777 Puerto Los Cabos 1 -109.674385 25 426 UANL 7881 1 San Jose 1324654210 2010-04-22 UANL, ARB 22.88586 Cabo 1 -109.91067 25 426 UANL 7880, 2 1 Cabo 1324654250 2011-05-26 2014-08-30 2011-05-26 PSU Golfo Persico 4 16.302221 Mar 21 -94.748886 San Dionisio 25 426 1 Oaxaca 1324654238 PSU ten Hove & Fouling On 5 On Puerto San Carlos 25 426 1 Cabo 1324654224 ten Hove Panama Eastern Pacific 25 426 1 1324654237 1968 2001 1968 ten Hove Australia Hawaii 25 426 1 Hawaii 1324654234 Australia Gulf of California 25 426 1 Northern Territory