Halosydna johnsoni ( Darboux, 1899 )

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 : 1192-1196

publication ID

https://doi.org/ 10.1080/00222933.2012.752934

persistent identifier


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scientific name

Halosydna johnsoni ( Darboux, 1899 )


Halosydna johnsoni ( Darboux, 1899) View in CoL

( Figures 7 View Figure 7 , 8 View Figure 8 )

Polynoe reticulata Johnson, 1897: 170–172 View in CoL , plate 7, figures 32, 41, plate 8, figure 47

(partim). Lepidonotus johnsoni Darboux, 1899: 246 footnote (replacement name). Polynoe californica Johnson, 1901: 387 footnote (replacement name). Halosydna californica: Treadwell, 1914: 180–181 . Halosydna johnsoni: Hartman, 1939a: 34–35 synonymy (partim); Salazar-Silva,


Type material

Syntype ( LACM-AHF POLY 1585) of Polynoe reticulata Johnson, 1897 , Pacific Grove, Monterey, County, California, USA, in tube of Amphitrite or Thelepus sp. , coll. & id. H.P. Johnson. Two syntypes ( LACM-AHF POLY 1582) of P. reticulata , San Pedro, Los Angeles, County, California, USA, rocky shore near low water mark, probably commensal with “huge Amphitrite ”, 25 June 1895, coll. & id. H.P. Johnson. One syntype ( LACM-AHF POLY 1581) of P. reticulata , San Pedro, California, USA, rocky shore, near low water mark, probably commensal with “huge amphitrite”, 25 June 1895, coll. & id. H.P. Johnson. One syntype ( LACM-AHF POLY 1588) of P. reticulata, Avalon, Santa Catalina Island, California, USA, 31 May 1896, coll. H.B. Torrey, id. H.P. Johnson.


Syntype ( LACM-AHF POLY 1585 ) complete, in good condition, subrectangular in cross-section, 36 segments, 2.6 cm long, 0.4 cm wide, some elytra detached ( Figure 7A View Figure 7 ). Prostomium bilobed, cephalic peaks absent ( Figure 7B View Figure 7 ); facial tubercle rounded, long; two pairs of eyes, anterior pair on widest part of prostomium, second segment partially obscuring posterior pair; median antenna with ceratophore inserted frontally on prostomial lobes, style slightly expanded subdistally, tapering to filiform tip; lateral antennae with ceratophores inserted terminally as prolongations of prostomium lobes, styles similar to median antenna. Palps robust with papillate surfaces. Pharynx not everted .

Tentacular segment not visible dorsally; tentaculophores with some chaetae; tentacular cirri similar to median antenna. Segment 2 projecting on prostomium as short, rounded lobe with two small tubercles dorsally ( Figure 7B View Figure 7 ).

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 three pairs of elytra fringed. First pair of elytra round ( Figure 7C View Figure 7 ), with short fringe of marginal papillae ( Figure 7D,E View Figure 7 ); surfaces with abundant microtubercles and macrotubercles sclerotized, conical-truncate, larger macrotubercles over elytrophore ( Figure 7F,G View Figure 7 ). Second pair of elytra ovoid ( Figure 8A View Figure 8 ); short fringe of marginal papillae ( Figure 8B View Figure 8 ); surfaces granulate, with micropapillae and microtubercles; microtubercles shorter than on first pair. Elytra in posterior half of body without fringe of papillae ( Figure 8C View Figure 8 ), surfaces smooth, with microtubercles mainly along posterior margin.

Notopodia shorter than neuropodia ( Figure 8D View Figure 8 ). Neuropodia distally truncate; prechaetal lobe with small, rounded lobe over acicular tip. Dorsal cirri similar to antennae, subdistally expanded, with pigmented band, distally tapering to filiform tips; cirrophore basally expanded. Elytrophores wider than dorsal tubercles. Ventral cirri long. Nephridial papillae from segment 2, thicker in median segments. Anus dorsal, near segment 36. Pygidium with two anal cirri, similar to dorsal cirri.

Notochaetae shorter than neurochaetae, not reaching distal neuropodial ends, with rows of spines; the smaller slightly curved; blunt tips; remaining notochaetae slen- der, tapering to capillary tips. Neurochaetae with rows of spines on upper region; tips bidentate, subdistal tooth short ( Figure 8E–G View Figure 8 ); some subacicular neurochaetae with subdistal tooth tiny ( Figure 8H View Figure 8 ).


Polynoe reticulata Johnson, 1897 , was a pre-occupied name, which was renamed to Lepidonotus johnsoni ( Darboux, 1899) , then to Polynoe californica ( Johnson, 1901) , and finally to Halosydna johnsoni ( Hartman, 1939a) .

Halosydna johnsoni has been confused and synonymized with H. brevisetosa . However, according to Johnson (1897), the latter has all elytra with a fringe of papillae on margins (absent in mid-body and posterior elytra in H. johnsoni ), those of anterior segments with prominent tubercles (smooth with only microtubercles along the posterior margin except for the first pair, which has abundant conical macrotubercles, in H. johnsoni ) and neurochaetae with entire tips (bidentate in H. johnsoni ).

Other syntypes of H. johnsoni also examined were LACM-AHF POLY 1583 ; LACM-AHF POLY 1584 ; LACM-AHF POLY 46 ; LACM-AHF POLY 1589 ; LACM- AHF POLY1587 ; LACM-AHF POLY 1591 ; LACM-AHF POLY 1586 ; LACM-AHF POLY 1590 ; LACM-AHF POLY1592 . All of them have labels indicating that Johnson did not designate types. Hence, the syntypes represent his original material. However, some specimens do not agree with the description of H. johnsoni and are herein reassigned to other species.

Type locality

San Pedro, California, USA, San Diego, California, USA and Santa Catalina Island, USA.


California, USA (Monterey, San Pedro, Santa Catalina Island).


Allan Hancock Foundation, University of Southern California














Halosydna johnsoni ( Darboux, 1899 )

Salazar-Silva, Patricia 2013

Polynoe reticulata

Johnson HP 1897: 172
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