Spirobranchus minutus 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

Spirobranchus minutus Rioja, 1941

Pomatoceros minutus in Rioja 1941b: 734-738, pl. 9, figs. 15-26.- Rioja 1942, 130-132, figs. 15-21.- Rioja 1947: 215.- Berkeley and Berkeley 1958: 405.- Bastida-Zavala 1993: 35.- Bastida-Zavala 2008: 31-33, figs. 7H-M.

Spirobranchus minutus .- Pillai 2009: 146-148.- Bastida-Zavala et al. 2016: 435-437, figs 8, 13H.

Materials

Type status: Other material. Occurrence: catalogNumber: LEMA-PO173 ; recordedBy: Beatriz Yáñez-Rivera; individualCount: 1; Taxon: phylum: Annelida; class: Polychaeta; order: Sabellida; family: Sabellidae; genus: Spirobranchus; 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

Description

Body 4.2 mm long, 0.5 mm wide. Thorax with seven chaetigers and abdomen +5 (incomplete specimen). Opercular peduncle with thin distal wings. Operculum hoof-shaped, calcareous, white and dark spots basally on each side and anterior dark (Fig. 14 E-F). Thoracic membrane extends to last thoracic chaetiger. Collar with limbate chaetae.

Distribution

Widely reported along the Mexican Pacific ( Bastida-Zavala et al. 2016).

Figures

Figure 14. Salmacina tribranchiata (Moore, 1923) and Spirobranchus minutus Rioja, 1941 b. Salmacina tribranchiata: A) Entire body, tube removed, B) radiolar crown and thorax, C) abdomen and pygidium, D) tubes. Spirobranchus minutus: E) radiolar crown and operculum, F) opercular peduncle and operculum. Scale bars: A-C) 0.2 mm, D) 2 mm, E) 1 mm, F) 0.5 mm.