Halosydna latior 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 : 1196-1199

publication ID

https://doi.org/ 10.1080/00222933.2012.752934

persistent identifier


treatment provided by


scientific name

Halosydna latior Chamberlin, 1919


Halosydna latior Chamberlin, 1919 View in CoL

( Figures 9 View Figure 9 , 10 View Figure 10 )

Halosydna latior Chamberlin, 1919a: 1–2 View in CoL .

Halosydna obtusa-cirrata Treadwell, 1937: 143–144 View in CoL , plate 1, figures 8–11.5.

Halosydna latior: Hartman, 1939a: 32 View in CoL ; Salazar-Silva, 2006: 148.

Halosydna brevisetosa: Skobsberg, 1942: 482–489 View in CoL (non Kinberg, 1856).

Type material

Holotype ( MCZ 2138) of Halosydna latior, Mussel Point, Laguna Beach , California, USA, coll. Hamilton, Field # PO 3. One paratype ( AMNH 2379) of Halosydna obtusacirrata Treadwell, 1937 , East of Cedros Island, Baja California Sur, Mexico, 73.15 m, dried, 22 May 1936.

Additional material

Three specimen ( LACM-AHF POLY 2387 ) of Puerto San Carlos, Sonora, Mexico, 27 ◦ 57 ′ 15 ′′ N, 111 ◦ 04 ′ 45 ′′ W, rock shingle, shore, R / V Velero III, station 1091-40, 8 February 1940, coll. Allan Hancock Foundation. Commensal worm, found in shells with large hermit, commensal in shell apex inhabited by Petrochiros californiensis, Bouvier, id. as H. latior GoogleMaps .


Holotype with 36 segments, 4.1 cm long, 1.2 cm wide, subrectangular in cross-section, pigmentation absent. Prostomium bilobed, as wide as long, slightly retracted into segment 2; lobes slightly separated, rounded, without peaks; facial tubercle short and rounded; two pairs of eyes, anterior pair on widest part of prostomium; posterior pair near posterior margin; median antenna with ceratophore inserted frontally, style subdistally expanded and ring of pigmentation, distally tapering to fine tip; lateral antennae with ceratophores inserted terminally as prolongations of prostomium lobes, styles similar to median antenna. Palps smooth, papillae absent. Pharynx not everted.

Tentacular segment not visible dorsally; tentaculophores lateral to prostomium, chaetae absent; tentacular cirri similar to antennae. Segment 2 with two small tubercles dorsally. First pair of elytrophores lateral to prostomium, prominent.

Body with 18 pairs of elytra, on segments 2, 4, 5, 7, 9, 11, then alternate to 21, 23, 25, 27, 28, 30, 31, 33. Three posteriormost segments with dorsal cirri. First pair of elytra missing. Second pair reniform ( Figure 10A View Figure 10 ). Elytra in median and posterior segments oval. All elytra with fringe of short and thick marginal papillae; surfaces granular, with microtubercles and macrotubercles. Microtubercles conicalblunt ( Figure 9A View Figure 9 ), scattered over entire surface. Macrotubercles over elytrophore scar, larger, circular as flattened disc-shape ( Figure 9B View Figure 9 ).

Notopodia shorter than neuropodia ( Figure 9C View Figure 9 ). Neuropodia distally truncate, prechaetal lobe with small rounded lobe near acicular tip. Dorsal cirri reaching neurochaetae tips, with ring of pigment subdistally. Cirrophores basally expanded. Elytrophores wider than dorsal tubercles. Ventral cirri short, not reaching distal neuropodial margin. Nephridial papillae long in median segments. Anus dorsal. Pygidium with anal cirri missing. Notochaetae shorter than neurochaetae; with rows of spines; tapering to capillary tips ( Figure 9D View Figure 9 ), the smaller curved with blunt tips. Neurochaetae with rows of spines on upper region, tips entire ( Figure 9E View Figure 9 ).


The other specimens of H. latior measure from 7.9 cm long and 1.6 cm wide to 1.8 cm long and 0.8 cm wide. However, all coincide with regard to elytra, parapodia and chaetae. The holotype lacks the anterior elytra, which are present in non-type specimens, where the first three pairs show a fringe of marginal papillae ( Figure 10C View Figure 10 ), granular surfaces with abundant microtubercles, macrotubercles over the elytrophore scar. The features of the remaining elytra agree with those of the holotype ( Figure 10D–G View Figure 10 ). Although the paratype of H. obtusa-cirrata Treadwell, 1937 , is dried, it is possible to distinguish the fringe and microtubercles on all elytra ( Figure 10C–E View Figure 10 ) and the macrotubercles on median elytra, like those present in H. latior ( Figure 10E–G View Figure 10 ) Hence H. obtusa-cirrata is considered a synonym of H. latior . Halosydna latior was described from Laguna Beach, California, and the records of Hartman (1939a) and the paratype of H. obtusa-cirrata are from Baja California, Mexico. Rioja (1963) recorded the species from Topolobampo, Mexico. Skobsberg (1942) reported H. brevisetosa from Monterey and Carmel Bays, but the features described agree with H. latior .

Type locality

Laguna Beach at Mussel Point, California, USA.


Laguna Beach, California, USA; Cedros Island, Baja California Sur, Mexico; Puerto San Carlos, Sonora, Mexico.


Museum of Comparative Zoology


Collection of the Zoological Institute of the Russian Academy of Sciences


American Museum of Natural History


Departamento de Geologia, Universidad de Chile


Royal British Columbia Museum - Herbarium














Halosydna latior Chamberlin, 1919

Salazar-Silva, Patricia 2013

Halosydna brevisetosa: Skobsberg, 1942: 482–489

Skobsberg T 1942: 489

Halosydna latior:

Salazar-Silva P 2006: 148
Hartman O 1939: 32

Halosydna obtusa-cirrata

Treadwell A 1937: 144

Halosydna latior

Chamberlin RV 1919: 2
Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF