Pseudobranchiomma schizogenica Tovar-Hernandez and Dean, 2014

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

Pseudobranchiomma schizogenica Tovar-Hernandez and Dean, 2014

Pseudobranchiomma schizogenica in Tovar-Hernández and Dean 2014: 936-944, figs. 1-5.- Keppel et al. 2019: 67-68, fig. 6.- Tovar-Hernández et al. 2019: 5, fig. 2C.

Materials

Type status: Other material. Occurrence: catalogNumber: LEMA-PO168 ; recordedBy: Beatriz Yáñez-Rivera; individualCount: 3; sex: Hermaphrodite; lifeStage: Adult; reproductiveCondition: Ripe; Taxon: phylum: Annelida; class: Polychaeta; order: Sabellida; family: Sabellidae; genus: Pseudobranchiomma; 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: 9; verbatimLatitude: 19°33 ’22’’ N; verbatimLongitude: 105°06 ’50’’ W; Identification: identifiedBy: María Ana Tovar-Hernández; Event: samplingProtocol: Scuba dive; eventDate: June 27, 2013; year: 2013; month: 6; day: 27; habitat: On rock; 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

Description

Gregarious fan worms. Soft, thin and flexible tubes composed of fine sand. Body length 12-18 mm, 1 mm width. Radiolar crown 9-12 mm long with 8 pairs of radioles. Thorax with eight chaetigers and abdomen with 59-62 chaetigers. Base of branchial crown purple (Fig. 13 A). Radioles with paired eyes along the entire length (Fig. 13 A-A1). Radioles with paired flanges (Fig. 13 A, C). Body with purple maculae (Fig. 13 A) and interramal eyespots along the body, located between nopodium and neuropodium (Fig. 13 A-B).

Taxon discussion

At first view, Pseudobranchiomma can be confused with Branchiomma because both are commonly gregarious, their bodies are full of purple maculae and both have interramal eyes and radioles with paired eyes. However, Branchiomma has long stylodes as tongue or straps-like filaments along radioles, easily seen under a stereoscope. In the Southern Gulf of California, it has been reported associated with man-made substrates in densities reaching 487 ind/m2, associated often with the invasive sabellid Branchiomma bairdi ( Tovar-Hernández and Dean 2014). Both species have been reported as introduced in Australia ( Capa and Murray 2015, Capa and Murray 2016) and both species have been also registered in Galapagos by Keppel et al. (2019): B. bairdi as introduced, whereas P. schizogenica inside their natural distribution area. As its reproduction is mainly by architomy (fission, asexual reproduction), it is common to find small specimens or clones in a chain below the parental worm ( Tovar-Hernández and Dean 2014).

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.