Halosydna salazarvallejoi, 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 : 1229-1231

Halosydna salazarvallejoi sp. nov.

( Figure 27 )

Halosydna sp 1 Salazar-Silva, 2006: 154

Type material

Holotype ( LACM-AHF POLY 3614 ), Scammon’s Lagoon , Laguna ojo de liebre, 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).

Etymology

This species is named in honour of Sergio Salazar-Vallejo for his dedication to the taxonomy of the polychaetes along Mexico’s coast.

Description

Holotype incomplete, an anterior fragment with 31 segments, 1.5 cm long, 0.3 cm wide. Dorsum and ventrum with dark pigment, also on ceratophores. Prostomium bilobed, without cephalic peaks; facial tubercle acute; two pairs of dark eyes, anterior pair on widest part of prostomium, posterior pair near posterior margin and smaller; median antenna with ceratophore, inserted frontally, style slightly subdistally expanded, tapering to filiform tip; lateral antennae with ceratophores inserted terminally as prolongations of prostomium lobes, at same level as median antenna ceratophore, styles similar to median antenna. Palps missing. Pharynx not everted.

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

Body with 17 pairs of elytra inserted on segments 2, 4, 5, 7, 9, 11, then alternate to 21, 23, 25, 27, 28, 30, 31, all with diffuse pigmentation. First pair of elytra circular ( Figure 27A ) with few, short marginal papillae; surfaces with abundant micropapillae and macrotubercles. Macrotubercles prominent, vesicular, not sclerotized, almost ovoid, elongate, scattered over elytra surfaces ( Figure 27A–C ). Second elytra pair and median elytra with few short marginal papillae; vesicular macrotubercles, ovoid, not sclerotized ( Figure 27D ). Elytra in posterior segments with few short marginal papillae; vesicular macrotubercles ovoid, not sclerotized, shorter than in more anterior elytra ( Figure 27E ).

Notopodia shorter than neuropodia. Neuropodia distally truncate with protruding acicular tip, prechaetal lobe with small, rounded lobe near acicula tip. Dorsal cirri short, similar to antennae. Cirrophores short, basally expanded. Ventral cirri tapering to filoform tips. Nephridial papillae elongate on median and posterior segments. Anus dorsal; pygidium with two anal cirri missing.

Notochaetae shorter than neurochaetae with rows of spines; the smaller curved, blunt tips; remaining ones slender tapering to capillary tip ( Figure 27F,G ). Neurochaetae with lateral rows of long spines on upper region, tips bidentate, subdistal tooth short and thinner ( Figure 27H ).

Remarks

The holotype was previously labelled as Halosydna species A sensu Hartman (1939a). However, the features of these species differ. They coincide in having elytra with soft tubercles (i.e. not sclerotized), but H. salazarvallejoi sp. nov. lacks sclerotized microtubercles on the elytra, the marginal papillae are scarce, and the soft tubercles are prominent and abundant on elytra.

Type locality

Scammon Lagoon, Baja California Sur, Mexico.

Distribution

Same as type locality.

Figures

Figure 27. Halosydna salazarvallejoi sp. nov. Holotype LACM-AHF POLY 3614. (A) First elytron; (B, C) same, macrotubercles; (D) elytron from middle segment; (E) elytron from posterior segment; (F, G) notochaetae; (H) neurochaeta.