Hydroides glandifera Rioja, 1941a

(Figures 5, 11 I)

Hydroides glandiferum Rioja, 1941a: 172 –174, pl. 4, Figs 10 –14 . Type locality: Caleta Beach, Acapulco, Guerrero, on rocks, algae and chaetopterid tubes (type specimens lost).

Olgaharmania glandifera Rioja, 1941b: 733 –734 (new genus and new combination); Salazar-Vallejo 1989a: 55 –56 (checklist); Salazar-Vallejo 1989b: 200 (Mexican coasts, checklist); Salazar-Vallejo & Londoño-Mesa 2004: 55 (Tropical Eastern Pacific, checklist).

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

Olgaharmania sp.— Bastida-Zavala 1995: 25 (Cabo Pulmo Reef, Baja California Sur, on coral; 4–17 m).

Hydroides glandifer .—Bastida-Zavala & ten Hove 2003: 89, Figs 12 A–M (Baja California Sur and Jalisco; 4–17 m) ; Salazar- Vallejo & Londoño-Mesa 2004: 54 (Tropical Eastern Pacific, checklist); Bastida-Zavala 2008: 26, fig. 6J (Oaxaca; 6–10 m); Bastida-Zavala 2009: 536, Fig. 2 H (identification key for Tropical America); ten Hove & Kupriyanova 2009: 53 (worldwide serpulid checklist); Bastida-Zavala et al. 2013: 349 (Oaxaca, checklist); Morales de Anda et al. 2014: 125 (Punta Mita, Nayarit and Navidad Bay, Jalisco; the locality Punta Anita, Jalisco was a mistake in Bastida-Zavala & ten Hove 2003).

Material examined. Three specimens.

Oaxaca: UMAR-POLY 769, 3 spec. ( Marina Chahué, Huatulco, on mollusk, May 22, 2000, coll. RBZ).

Habitat. Intertidal to subtidal (17 m, Bastida-Zavala 1995). On mollusk in a dock. Also on dead coral Pocillopora and on spiny oyster Spondylus calcifer (now S. limbatus) (Bastida-Zavala 2008).

Distribution. Mexican Pacific. Baja California Sur to Oaxaca (Bastida-Zavala & ten Hove 2003).

Remarks. From Rioja’s original name Hydroides glandiferum, subsequently changed to Olgaharmania glandifera, it is evident that Rioja intended the specific name to be an adjective which should follow the gender of the genus. Since the genus Hydroides in the meantime is feminine again (ICZN 1999: Art. 30.1.4.4), the correct ending is –a.

Hydroides glandifera is found on corals and mollusks; it is a rare species in the Mexican Pacific.