Halosydna tuberculifer Chamberlin, 1919

Salazar-Silva, Patricia, 2013, Revision of Halosydna Kinberg, 1856 (Annelida: Polychaeta: Polynoidae) from the Tropical Eastern Pacific and Grand Caribbean with descriptions of new species, Journal of Natural History 47 (17 - 18), pp. 1177-1242 : 1218-1222

publication ID

https://doi.org/ 10.1080/00222933.2012.752934

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scientific name

Halosydna tuberculifer Chamberlin, 1919


Halosydna tuberculifer Chamberlin, 1919 View in CoL

( Figures 21 View Figure 21 , 22 View Figure 22 )

Halosydna tuberculifer Chamberlin, 1919a: 2 View in CoL ; Rioja, 1963: 148–153, figures 49–57. Halosydna species B Hartman, 1939a: 38 , plate 22, figures 273–279; Salazar-Silva,

2006: 149.

Material examined

Pacific Ocean, Mexico: one specimen ( LACM-AHF POLY 2435 ), Bahía San Juánico , Baja California Sur, 26 ◦ 11 ′ 50 ′′ N, 112 ◦ 29 ′ 05 ′′ W, R / V Velero III, station 617-37, 43.9 m, Velero, sand and kelp, 2 March 1937, coll. Allan Hancock Foundation GoogleMaps , id. as Halosydna species B by O. Hartman. Two specimens ( ECOSUR P02574), Villa las Rosas, Ensenada, Baja California, 31 ◦ 52 ′ 19.24 ′′ N, 116 ◦ 40 ′ 43.24 ′′ W, on sea grass roots, 6 March 2004 GoogleMaps . Two specimens ( ECOSUR P02575), Villas las Rosas, Ensenada, Baja California, 31 ◦ 52 ′ 19.24 ′′ N, 116 ◦ 40 ′ 43.24 ′′ W, on sea grass roots, 6 March 2004 GoogleMaps . Two specimens ( ECOSUR P02576), Villas las Rosas, Ensenada, Baja California, M 31 ◦ 52 ′ 19.24 ′′ N, 116 ◦ 40 ′ 43.24 ′′ W, on sea grass roots, 6 March 2004 GoogleMaps .


Specimen (ECOSUR P02574), complete, in good condition. Body with 36 segments, 1.6 cm long and 0.4 cm wide. Dorsum with brown pigment along dordal midline, ceratophores, and palps. Prostomium bilobed, wider than long, without prostomial peaks ( Figure 22A View Figure 22 ); facial tubercle small, pigmented; two pairs of round, dark eyes, anterior pair dorsolateral on widest part of prostomium, posterior pair smaller, near posterior border; median antenna with ceratophore inserted frontally, dark pigmented, style missing; lateral antennae with ceratophores, inserted terminally as prolongations of prostomium, darkly pigmented, styles subdistally expanded, almost clavate, filiform distal tip. Palps robust, diffuse pigment and micropapillae, abruptly tapering to short tips. Pharynx everted, nine pairs of papillae distally, two pairs of amber-coloured jaws, not fused to each other.

Tentacular segment not visible dorsally; tentaculophores with chaetae present; tentacular cirri similar to lateral antennae. Segment 2 projects over prostomium as short lobe with two small, lateral tubercles.

Body with 18 pairs of elytra on segments 2, 4, 5, 7, 9, 11, then alternate to 21, 23, 25, 27, 28, 30, 31. Three posteriormost segments with dorsal cirri. Elytra with small spots of greyish pigment, becoming diffuse towards posterior margin, unpigmented medially and over elytrophore scar. First pair of elytra circular ( Figure 21A View Figure 21 ), short, numerous papillae on margins ( Figures 21C View Figure 21 , 22B View Figure 22 ); surfaces with blunt microtubercles, some macrotubercles conical, distally pointed ( Figures 21B,C View Figure 21 , 22C,D View Figure 22 ) and others distally blunt ( Figures 22F View Figure 22 ). Elytra in median and posterior segments oval ( Figure 21D View Figure 21 ), with marginal papillae ( Figure 21D,E View Figure 21 ), surfaces granulate due to abundant microtubercles ( Figure 21E View Figure 21 ), macrotubercles, and cylindrical micropapillae ( Figure 21F View Figure 21 ); microtubercles and macrotubercles sclerotized, distally blunt.

Notopodia shorter than neuropodia ( Figure 22G View Figure 22 ). Neuropodia distally truncate, without distinct prechaetal and postchaetal lobes, small rounded lobe near acicula tip. Dorsal cirri similar to antennae, with ring of subdistal pigment. Cirrophores basally expanded. Elytrophores wider than dorsal tubercles. Nephridial papillae elongated on median and posterior segments. Ventral cirri tapering to filiform tip. Anus dorsal. Pygidium with anal cirri missing.

Notochaetae shorter than neurochaetae; with rows of spines; the smaller curved, blunt tips ( Figure 22H View Figure 22 ); remaining notochaetae slender taper to capillary tips. Neurochaetae with rows of spines on upper region, tips entire ( Figure 22I View Figure 22 ). Neurochaetae are more spinous in first two chaetigers, distal ends capillary, entire.


The specimen LACM-AHF POLY 2435 [reported by Hartman (1939a) as Halosydna species B ] is in poor condition and incomplete, with 32 segments, 0.45 cm wide and 1.6 cm long. However, it agrees with the specimen herein described, as well as with the features described by Chamberlin (1919a) for the specimens found in Laguna Beach, California. The species was not illustrated by Chamberlin but the original description refers to the presence of abundant conical tubercles on elytra, especially larger in the first three chaetigers, which agrees with material examined in this study. The specimens reported by Rioja (1963) from Isla Cedros also agree with the original description. The type material was not examined because it cannot be found in the MCZ.

New records of H. tuberculifer are included herein for Baja California, Mexico. The larger specimen being 2.3 cm long and 0.4 cm wide. All specimens show brownish spots on elytra, abundant blunt microtubercles, and some macrotubercles.

Halosydna tuberculifer resembles H. brevisetosa in having unidentate neurochaetae and elytra with prominent macrotubercles, but the latter has median and posteriormost elytra only with microtubercles.

Type locality

Laguna Beach, California.


California, USA; Baja California, Mexico; Baja California Sur, Mexico.


Departamento de Geologia, Universidad de Chile


Royal British Columbia Museum - Herbarium


El Colegio de la Frontera Sur (Mexico)














Halosydna tuberculifer Chamberlin, 1919

Salazar-Silva, Patricia 2013

Halosydna tuberculifer

Rioja E 1963: 148
Hartman O 1939: 38
Chamberlin RV 1919: 2
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