Hydroides brachyacantha Hydroides brachyacanthus Tubicolous polychaete worms (Annelida) from Bahia de Chamela Islands Sanctuary, Mexico, with the description of a new bamboo worm Yanez-Rivera, Beatriz Tovar-Hernandez, Maria Ana Galvan-Villa, Cristian Moises Rios-Jara, Eduardo Biodiversity Data Journal 2020 8 57572 57572 6097AAF2-2B76-55E3-8BAB-0D4C17DE15B0 Rioja, 1941 Rioja 1941 Polychaeta Serpulidae Hydroides CoL Animalia Hydroides brachyacantha Sabellida 0 57572 Annelida species brachyacantha   Hydroides brachyacanthain  Rioja 1941a: 169-172, pl. 3, fig. 2, pl. 4, figs. 1-9.- Sun et al. 2016: 49-54, figs. 5, 6A-F.- Bastida-Zavala et al. 2016: 413-414, figs. 3, 11B.-  Chavez-Lopezand Cruz-Gomez2019: 162.  Hydroides brachyacanthus.- Bastida-Zavala and ten Hove 2003: 73-76, figs. 3A-M, 7A-F.-  Cinar2006: 225-226, fig. 2.- Bastida-Zavala 2008: 22-23, fig. 6C.-  Tovar-Hernandezet al. 2009: 328-330, figs. 3j, 7d-f.  Materials   Type status: Other material. Occurrence:catalogNumber: LEMA-PO169; recordedBy: Beatriz Yanez-Rivera; individualCount: 2; Taxon:phylum: Annelida; class: Polychaeta; order: Sabellida; family: Sabellidae; genus: Hydroides; Location:higherGeographyID: Pacific Ocean; higherGeography: Tropical Eastern Pacific; continent: America; islandGroup: Islas de Chamela; island: Isla Cocinas; country:  Mexico; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; minimumDepthInMeters: 3; maximumDepthInMeters: 4; verbatimLatitude: 19°32 '45''N; verbatimLongitude: 105°06 '27''W; Identification:identifiedBy:  MariaAna Tovar-Hernandez; Event:samplingProtocol: Scuba dive; eventDate: June 27, 2013; year: 2013; month: 6; day: 27; habitat: On coral; fieldNumber: Site 15; Record Level:language: Spanish; institutionID: Universidad de Guadalajara; collectionID: Coleccion Biologicadel Laboratorio de Ecosistemas Marinos y Acuicultura; institutionCode: UDG; collectionCode: LEMA  Type status: Other material. Occurrence:catalogNumber: LEMA-PO170; recordedBy: Beatriz Yanez-Rivera; individualCount: 7; Taxon:phylum: Annelida; class: Polychaeta; order: Sabellida; family: Sabellidae; genus: Hydroides; Location:higherGeographyID: Pacific Ocean; higherGeography: Tropical Eastern Pacific; continent: America; islandGroup: Islas de Chamela; island: Isla Pajarera; country:  Mexico; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; maximumDepthInMeters: 7; verbatimLatitude: 19°33 '22''N; verbatimLongitude: 105°06 '50''W; Identification:identifiedBy:  MariaAna Tovar-Hernandez; Event:samplingProtocol: Scuba dive; eventDate: June 26, 2013; year: 2013; month: 6; day: 26; habitat: On rock-coral; fieldNumber: Site 21; Record Level:language: Spanish; institutionID: Universidad de Guadalajara; collectionID: Coleccion Biologicadel Laboratorio de Ecosistemas Marinos y Acuicultura; institutionCode: UDG; collectionCode: LEMA  Type status: Other material. Occurrence:catalogNumber: LEMA-PO171; individualCount: 1; Taxon:phylum: Annelida; class: Polychaeta; order: Sabellida; family: Sabellidae; genus: Hydroides; Location:higherGeographyID: Pacific Ocean; higherGeography: Tropical Eastern Pacific; continent: America; islandGroup: Islas de Chamela; island: Isla Pajarera; country:  Mexico; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; minimumDepthInMeters: 3; maximumDepthInMeters: 4; verbatimLatitude: 19°33 '29''N; verbatimLongitude: 105°06 '40''W; Identification:identifiedBy:  MariaAna Tovar-Hernandez; Event:samplingProtocol: Snorkel; eventDate: June 27, 2013; year: 2013; month: 6; day: 27; habitat: On coral; fieldNumber: Site 20; Record Level:language: Spanish; institutionID: Universidad de Guadalajara; collectionID: Coleccion Biologicadel Laboratorio de Ecosistemas Marinos y Acuicultura; institutionCode: UDG; collectionCode: LEMA  Description Body 8-10 mm long, 0.8-1 mm wide. Radiolar crown length 1.5-1.7 mm with 8-10 pairs of radioles. Thorax with seven chaetigers and abdomen with 61-64 segments. Verticil with 8-12 yellow to dark brown spines unequal in size (Fig. 13D-H). Dorsal hook broad, curved, larger than all other spines, covering central disc. Other spines with pointed tip and pronounced knob each. First and second pair of dorsal spines (lateral to dorsal hook) with tips and trunks wider than all other spines (Fig. 13D-H). Collar chaetae bayonet with two blunt teeth; distal blade smooth.  Taxon discussion   Hydroides brachyacanthaRioja, 1941 ( Rioja 1941a), an important fouling serpulid species originally described from Mazatlan(Southern Gulf of California, Mexico) and Acapulco (southern Mexican Pacific), has been reported from the Mexican Pacific and numerous tropical and subtropical localities ( Rioja 1941a,  Tovar-Hernandezet al. 2009, Bastida-Zavala and ten Hove 2003, Bastida-Zavala 2008, Bastida-Zavala et al. 2016). At the MazatlanPort, the mean annual density of  H. brachyacanthaduring 2009 was 80 ind m-2 (fouling assemblages in metallic buoys), with a minimum of 4 ind m-2 in November and a maximum of 304 ind m-2 in March ( Sun et al. 2016). Recently, a neotype was established by Sun et al. (2016), who also demonstrated that the previous records from the species in Australia belongs to a different lineage. 2013-6-27 Scuba dive UDG, LEMA Beatriz Yanez-Rivera Mexico 19.545834 Mexico 21 -105.1075 0 57572 LEMA-PO 169 2 Other material 2013-6-26 Scuba dive UDG, LEMA Beatriz Yanez-Rivera Mexico 19.55611 Mexico 21 -105.113884 0 57572 LEMA-PO 170 7 Other material 2013-6-27 Snorkel UDG, LEMA Mexico 19.558054 Mexico 21 -105.11111 0 57572 LEMA-PO 171 1 Other material