Hydroides panamensis Bastida-Zavala & ten Hove 2003

Hydroides panamensis Bastida-Zavala & ten Hove, 2003 (Figures 6, 12 D) Hydroides panamensis Bastida-Zavala & ten Hove, 2003: 97 –99, Figs 18A–N. Type locality: Paitilla Beach, Pacific side of Panamá; also from La Libertad, Ecuador; 0–9 m. Hydroides panamensis.— Salazar-Vallejo & Londoño-Mesa 2004: 54 (Tropical Eastern Pacific, checklist); Bastida-Zavala 2008: 28, fig. 6O (mentioned only); Bastida-Zavala 2009: 534, Fig. 2 S (identification key for Tropical America); ten Hove & Kupriyanova 2009: 54 (worldwide serpulid checklist); Tovar-Hernández et al. 2015: 3 (Costa Rica, comparison with H. dolabrus). Material examined. 10 specimens. Michoacán: UMAR-Poly 774 (Faro de Bucerías, on sabellariid tubes, December 21, 1996, coll. SGM). Oaxaca: UMAR-Poly 775 (Agua Blanca Beach, rocks, intertidal, April 27, 2012, coll. OECR); UMAR-Poly 776 (Estacahuite, Puerto Ángel, rocks, intertidal, June 2, 2012, coll. AVB); UMAR-POLY 777 (Marina Chahué, Huatulco, on mollusc, May 22, 2000, coll. RBZ); UMAR-Poly 778, 4 spec. (Salina Cruz, angler pier, main dock, sta. 4, 1 m, May 26, 2011, coll. SGM et al.); UMAR-POLY 779, 2 spec. (“sample 85”, Oaxaca, 0–6 m, September 15, 2004). Habitat. Intertidal to subtidal (9 m, Bastida-Zavala & ten Hove 2003). On sabellariid colonies, on mollusk in a dock and on an angler pier; on rocks. Salinity range of 19–37 PSU (Bastida-Zavala & ten Hove 2003). Fouling species in marinas, ports and on PVC plates in Punta Culebra, Panamá (Bastida-Zavala, pers. obs.). Distribution. Previously known from the Pacific of Panamá and Ecuador (Bastida-Zavala & ten Hove 2003), and Costa Rica (Tovar-Hernández et al. 2015), the known geographical range of Hydroides panamensis is extended to Faro de Bucerías, Michoacán, along the littoral approximately 3,075 km to the north. Remarks. Hydroides panamensis was found both on natural and anthropogenic substrates, being more common on the latter. The species is very abundant in Panamá and is relatively scarce in México, which possibly suggest a recent introduction by ships and yachts. This fouling species has potential to be introduced to other tropical regions by ships. Some specimens from Mazatlán, Sinaloa were recorded as Hydroides recurvispina by Tovar-Hernández et al. (2009b); later those specimens were described as a new species, H. dolabrus Tovar-Hernández, Villalobos- Guerrero, Kupriyanova & Sun, 2015, supported with morphological and molecular characters. Tovar-Hernández et al. (2015: 9) mentioned that “ Hydroides dolabrus sp. nov. is more similar to H. panamensis than to the rest of the species to the extent that these two species can be easily confused; and the phylogram, based on the combined dataset of 18S, cyt b and COI DNA sequence fragments, show both species as a sister group.Published as part of 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, pp. 401-457 in Zootaxa 4184 (3) on pages 424-425, DOI: 10.11646/zootaxa.4184.3.1, http://zenodo.org/record/25506