Halosydna fuscomarmorata ( Grube, 1876 )

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 : 1183-1185

Halosydna fuscomarmorata ( Grube, 1876)

( Figures 2 , 3 )

Polynoe fuscomarmorata Grube, 1876: 62–63 .

Halosydna fuscomarmorata: Augener, 1906: 117–119 , plate 3, figures 41–44; Hartman, 1938: 109; Hartman, 1939a: 32, pl. 9, figures 119, 120 (partim); Seidler, 1924: 120-122; Salazar-Silva, 2006: 147.

Type material

Holotype ZMB 1171 , Payta, Perú, coll. Grube, Jelski leg.

Aditional material

One specimen ( LACM-AHF POLY 2433 ), Independencia Bay, Perú, 14 ◦ 14 ′ 08 ′′ S, 76 ◦ 08 ′ 30 ′′ W R / V Velero III, sta 380-35, shore, rock, 14 January 1935, coll. Allan Hancock Foundation, id. Hartman (1939) .

Remarks

The type material of Halosydna fuscomarmorata consists of two elytra and one midbody parapodium, dried, clearly belonging to the genus because of the shape of the neuropodium (prechaetal lobe with a small lateral lobe near the acicular tip), notochaetae and neurochaetae. Elytra without fringe of marginal papillae; with abundant microtubercles, sclerotized, rounded distally, scattered over the surface, some larger and more scattered. Notopodia shorter than neuropodia. Notochaetae shorter than neurochaetae, the smaller slightly curved with blunt tips, larger ones tapering to capillary tips. Neurochaetae thicker than notochaetae, with bidentate tips.

Augener (1906) and Seidler (1924), described H. fuscomarmorata has having 18 pairs of elytra, with microtubercles along margins and some larger ones over the surface, as were illustrated by Augener (1906) and coincide with observations of available type material.

Halosydna fuscomarmorata was recorded by Hartman (1939a) from Independencia Bay, Perú; Port Utria, Colombia and from Piñas Bay, Panamá. However, the features of these specimens agree with those of Halosydna elegans Monro (1928: 567) not Kinberg (1858) from Limon Bay ( Panamá) in having small, soft, vesicular tubercles in addition to sclerotized on the three first pairs of elytra and posterior elytra. The specimen from Independencia Bay, Perú (LACM-AHF POLY 2433), examined by Hartman (1939a), agrees with type material of H. fuscomarmorata .

The specimen LACM-AHF POLY 2433 lacks some posteriormost segments, but is in good condition. It is 1.6 cm long, 0.4 cm wide. Prostomiun bilobed; facial tubercle rounded, dark; two pairs of eyes; ceratophore of median antenna inserted frontally, style subdistally expanded and tip filiform; ceratophores of lateral antennae thinner, inserted terminally as prolongations of prostomium lobes. Palps robust abruptly tapering to small tips; segment two does not project over prostomium; tentaculophores with chaetae.

The elytra are greyish ( Figure 2A ), fleshy, with smooth surfaces, without fringe of marginal papillae. The first pair of elytra are circular ( Figure 2B ), with abundant sclerotized microtubercles, conical, scattered on the surface, the largest over the elytrophore scar ( Figure 2C ) and the smaller around the margin ( Figure 2D,E ). Second pair of elytra and posterior elytra oval ( Figure 2F ), with papillate surfaces and microtubercles short, sclerotized, conical-truncated, abundant around margins ( Figure 2G,H ).

Parapodia biramous. Notopodia shorter than neuropodia ( Figure 3A ). Neuropodia distally truncated, prechaetal lobe with small rounded lobe over acicular tip. Notochaetae shorter than neurochaetae, not reaching distal neuropodial margin, the smaller curved and blunt tips, remaining slender tapering to capillary tips. Neurochaetae with rows of spines on upper region, bidentate tips ( Figure 3B,C ).

The record of H. fuscomarmorata from Bahía Magdalena and Cabo San Lucas, Baja California, Mexico, includes a short description which does not mention the elytral shape ( Hartman, 1939b: 4) so that the presence of this species in Baja California is uncertain .

Type locality

Payta, Perú.

Distribution

Known from Perú: Payta and Independencia Bay.

Figures

Figure 2. Halosydna fuscomarmorata (Grube, 1876). LACM-AHF POLY 2433. (A) Anterior end, dorsal view; (B) first elytron; (C–E) same, macrotubercles; (F) right elytron from middle segment; (G, H) same, marginal microtubercles.

Figure 3. Halosydna fuscomarmorata (Grube, 1876). LACM-AHF POLY 2433. (A) Parapodium; (B) bidentate neurochaeta; (C) same, details of the neurochaetae tips.