Hydroides brachyacantha Rioja, 1941

Yanez-Rivera, Beatriz, Tovar-Hernandez, Maria Ana, Galvan-Villa, Cristian Moises & Rios-Jara, Eduardo, 2020, Tubicolous polychaete worms (Annelida) from Bahia de Chamela Islands Sanctuary, Mexico, with the description of a new bamboo worm, Biodiversity Data Journal 8, pp. 57572-57572 : 57572

Hydroides brachyacantha Rioja, 1941

Hydroides brachyacantha in 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.- Chávez-López and Cruz-Gómez 2019: 162.

Hydroides brachyacanthus .- Bastida-Zavala and ten Hove 2003: 73-76, figs. 3A-M, 7A-F.- Çinar 2006: 225-226, fig. 2.- Bastida-Zavala 2008: 22-23, fig. 6C.- Tovar-Hernández et al. 2009: 328-330, figs. 3j, 7d-f.

Materials

Type status: Other material. Occurrence: catalogNumber: LEMA-PO169 ; recordedBy: Beatriz Yáñez-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: México; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; minimumDepthInMeters: 3; maximumDepthInMeters: 4; verbatimLatitude: 19°32 ’45’’ N; verbatimLongitude: 105°06 ’27’’ W; Identification: identifiedBy: María Ana Tovar-Hernández; 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: Colección Biológica del Laboratorio de Ecosistemas Marinos y Acuicultura; institutionCode: UDG; collectionCode: LEMA Type status: Other material. Occurrence: catalogNumber: LEMA-PO170 ; recordedBy: Beatriz Yáñez-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: México; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; maximumDepthInMeters: 7; verbatimLatitude: 19°33 ’22’’ N; verbatimLongitude: 105°06 ’50’’ W; Identification: identifiedBy: María Ana Tovar-Hernández; 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: Colección Biológica del 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: México; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; minimumDepthInMeters: 3; maximumDepthInMeters: 4; verbatimLatitude: 19°33 ’29’’ N; verbatimLongitude: 105°06 ’40’’ W; Identification: identifiedBy: María Ana Tovar-Hernández; 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: Colección Biológica del 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. 13 D-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. 13 D-H). Collar chaetae bayonet with two blunt teeth; distal blade smooth.

Taxon discussion

Hydroides brachyacantha Rioja, 1941 ( Rioja 1941a), an important fouling serpulid species originally described from Mazatlán (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-Hernández et al. 2009, Bastida-Zavala and ten Hove 2003, Bastida-Zavala 2008, Bastida-Zavala et al. 2016). At the Mazatlán Port, the mean annual density of H. brachyacantha during 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.

Figures

Figure 13. Pseudobranchiomma schizogenica Tovar-Hernandez and Dean, 2014 and Hydroides brachyacantha Rioja, 1941 a. Pseudobranchiomma schizogenica: A) radiolar crown and thorax, A 1) paired radiolar eyes, A 2) radiolar flanges, B) interramal eyes, C) radiole with flanges. Hydroides brachyacantha: D-H) opercula, different angle views. Scale bars: A-B) 3 mm, C, F-H) 0.3 mm, D-E) 0.5 mm.