Halosydna silvamariae, Salazar-Silva, 2013

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 : 1231-1232

Halosydna silvamariae sp. nov.

( Figures 28 , 29 )

Halosydna sp 2 Salazar-Silva, 2006: 154.

Type material

Holotype ( LACM-AHF POLY 3615), Scammon’s Lagoon, Baja California Sur, Mexico, R / V Hori-zon, station KG-8, 3.66 m, 14 September 1953, coll J.W. Knudsen and Gorsline id. as Halosydna species A of Hartman (1939a). One paratype ( LACM- AHF POLY 3616), Scammon’s Lagoon, Baja California Sur, Mexico, station KG-3, 5.5–8.2 m, R / V Hori-zon, 13 September 1953, coll. J.W. Knudsen and Gorsline, id. as Halosydna species A of Hartman (1939a).

Etymology

The species name is derived from the name of the author’s mother.

Description

Holotype complete, with 36 segments, 2.0 cm long and 0.4 cm wide. Prostomium bilobed, without cephalic peaks; facial tubercle small, rounded, with dark pigment; two pairs of eyes, anterior pair on widest part of prostomium, posterior pair near posterior margin; median antenna with ceratophore inserted frontally on prostomial lobes, style slightly expanded subdistally, tapering to short tip; lateral antennae with ceratophores inserted terminally as prolongations of prostomium lobes, styles similar to median antenna. Palps papillate, taper abruptly to small tips. Pharynx not everted.

Tentacular segment not visible dorsally; tentaculophores short; tentacular cirri similar to antennae. Segment 2 projecting over prostomium as short nuchal lobe, with two small dorsal 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, 33. Three posteriormost segments with dorsal cirri. Elytra with green pigment on midline, first pair less pigmented. First pair of elytra circular, without marginal papillae; surfaces with vesicular macrotubercles not sclerotized, ovoid, abundant, more prominent near margins ( Figure 28A,B ), microtubercles absent. Elytra of median and posterior segments without marginal papillae ( Figure 28C,D ); surfaces with micropapillae and vesicular macrotubercles. Macrotubercles less prominent and scattered ( Figure 28E,F ).

Notopodia shorter than neuropodia. Neuropodia distally truncate, acicula tip protruding, prechaetal lobe with small rounded lobe near acicular tip. Dorsal cirri subdistally expanded and tapering to short tips. Cirrophores basally expanded. Nephridial papillae, present from segment 16. Ventral cirri tapering to filiform tip. Anus dorsal, pygidium with two anal cirri similar to dorsal cirri.

Notochaetae shorter than the neurochaetae with rows of spines; the smaller curved, with blunt tips; the remaining ones slender tapering to capillary tips. Neurochaetae, with rows of spines on upper region, tips bidentate.

Remarks

The features of the paratype ( Figure 29A–G ) are consistent with those of the holotype. The material examined was previously labelled as Halosydna sp. A sensu Hartman (1939a) but the elytra of Halosydna silvamariae sp. nov. lack marginal papillae and sclerotized microtubercles, and the vesicular macrotubercles are around the margin. Halosydna salazarvallejoi sp. nov. resembles H. silvamariae sp. nov. but differs in having a fringe of marginal papillae on the anterior elytra and soft macrotubercles less prominent and scattered on the elytral surface.

Type locality

Scammon Lagoon, Baja California, Mexico.

Distribution

Same as type locality.

Figures

Figure 28. Halosydna silvamariae sp. nov. Holotype LACM-AHF POLY 3615. (A, B) Elytra of first pair; (C) right elytron from middle segment; (D) right elytron from posterior segment; (E, F) same, macrotubercles.

Figure 29. Halosydna silvamariae sp. nov. Paratype LACM-AHF POLY 3616 (A) First elytron; (B) same, macrotubercles; (C) right elytron from posterior segment; (D) same, micropapilla; (E) notochaetae; (F) shorter notochaetae; (H) bidentate neurochaetae.