Halosydna virgini Kinberg, 1856

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 : 1222-1224

Halosydna virgini Kinberg, 1856

( Figure 23 )

Halosydna virgini Kinberg, 1856: 384 ; Kinberg, 1858: 15–16; Seidler, 1924: 120; Hartman, 1938: 109.

Type material

Holotype (SMNH-Type 410), Honolulu, Hawaii Island , 21 ◦ 19 ′ N, 157 ◦ 52 ′ W, leg Eugenie, Expedition 1851–53.

Description

Holotype incomplete; an anterior fragment with 19 segments, yellow-pale. Prostomium in poor condition. Seven pairs of elytra attached, overlapping. Elytra margins with thick, long papillae ( Figure 23A,B ), surfaces covered with conical microtubercles ( Figure 23C ), some truncate and others pointed.

Notopopodia shorter than neuropodia ( Figure 23D ). Neuropodia distally truncate, prechaetal and postchaetal lobes indistinct, prechaetal lobe with small rounded lobe near acicular tip. Dorsal cirri detached. Cirrophores basally expanded. Elytrophores wider than dorsal tubercles. Ventral cirri tapering to filiform tip.

Notochaetae shorter than neurochaetae, with rows of spines; the smaller chaetae shorter, curved, blunt tips; the remaining notochaetae slender tapering to capillary tips ( Figure 23F ). Neurochaetae with rows of spines on upper region; bidentate tips, main tooth curved, subdistal tooth short ( Figure 23E ).

Remarks

The species, known from Hawaii, was originally described as having 35 segments, 18 pairs of elytra and bidentate neurochaetae. However, it was synonymized with Halosydna parva from Peru ( Hartman 1949). Despite the present condition of the holotype, its features are clear: elytra margins with long papillae thicker than in H. parva and elytra lack the thick macrotubercles present in this species. Therefore, it must be considered a valid species.

Type locality

Honolulu, Hawaii Island , 21 ◦ 19 ′ N, 157 ◦ 52 ′ W .

Distribution

Same as type locality.

Figures

Figure 23. Halosydna virgini Kinberg, 1856. Holotype SMNH-Type 410. (A) First elytron; (B) same, fringe; (C) microtubercles; (D) parapodium, posterior view; (E) bidentate neurochaetae; (F) notochaetae.