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

Halosydna johnsoni ( Darboux, 1899)

( Figures 7 , 8 )

Polynoe reticulata Johnson, 1897: 170–172 , 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,

2006:147.

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.

Description

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 ). Prostomium bilobed, cephalic peaks absent ( Figure 7B ); 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 ).

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

Notopodia shorter than neuropodia ( Figure 8D ). 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 ); some subacicular neurochaetae with subdistal tooth tiny ( Figure 8H ).

Remarks

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.

Distribution

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

Figures

Figure 7. Halosydna johnsoni (Darboux, 1899). Syntype LACM-AHF POLY 1585. (A, B) Anterior end, dorsal view; (C) first elytron; (D, E) same, fringe of papillae; (F, G) same, microtubercles.

Figure 8. Halosydna johnsoni (Darboux, 1899). Syntype LACM-AHF POLY 1585. (A) Left elytron from middle segment, (B) same, fringe of papillae; (C) elytron from posterior segments; (D) parapodium; (E) bidentate neurochaetae; (F–H) neurochaetae tips.