Halosydna nesiotes (Chamberlin, 1919)

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 : 1210-1212

publication ID

https://doi.org/ 10.1080/00222933.2012.752934

DOI

https://doi.org/10.5281/zenodo.5196604

persistent identifier

https://treatment.plazi.org/id/2D304A56-FFBE-F54A-37D1-FD56FD61FCD2

treatment provided by

Felipe

scientific name

Halosydna nesiotes (Chamberlin, 1919)
status

 

Halosydna nesiotes (Chamberlin, 1919) View in CoL

( Figure 16 View Figure 16 )

Polynoe nesiotes Chamberlin, 1919b: 72–74 View in CoL , plate 8, figure 8, plate 9, figures 1–5. Malmgrenia nesiotes: Hartman, 1938: 122 View in CoL .

Halosydna nesiotes: Hanley, 1987: 160 View in CoL ; Salazar-Silva, 2006: 148.

Type material

Holotype ( USNM 19460 View Materials ) of Polynoe nesiotes Chamberlin, 1919b , Isla Santa Margarita , Baja California Sur, Mexico, Albatross expedition 1891, id. R. V Chamberlin.

Description

Holotype in two fragments, not complete, anterior fragment with 14 segments, posterior fragment with 21 segments. Body dried, but the following features can be distinguished. Body with 18 pairs of elytrophores, seven on anterior fragment, 11 on posterior fragment, posteriormost segments with dorsal cirri. Elytra attached on anterior fragment absent on posterior fragment. Elytra without marginal papillae; surfaces granular due to numerous microtubercles ( Figure 16A View Figure 16 ). The microtubercles conical-truncate, short, scattered over posterior half of surface ( Figure 16B View Figure 16 ). Some elytra with tubercles hemispherical, large, sclerotized.

Notopodia shorter than neuropodia. Neuropodia distally truncate, small rounded lobe near acicula tip. Dorsal cirri and cirrophore dehydrated ( Figure 16C View Figure 16 ). Anus dosal. Pygidium with anal cirri missing.

Notochaetae with rows of spines, the smaller curved, blunt tips, remaining ones slender tapering to capillary tips. Neurochaetae with rows of spines on upper region, tips bidentate, main tooth slightly curved, subdistal tooth shorter ( Figure 16D–F View Figure 16 ).

Remarks

Although the holotype is dried, the parapodia, neurochaetae, number of elytra and segments agree with those of Halosydna as stated by Salazar-Silva (2006). Halosydna nesiotes is distinguished by having elytra without marginal papillae, but with microtubercles conical-truncate (abundant and short on posterior half) and longer hemispherical tubercles in some elytra. Chamberlin (1919b) decribed the species as having a “shrunken” prostomium (but prostomial appendages were not described), 34 segments and 15 pairs of elytra. However, it was described as having “granular appearance due to the presence of papillae and tubercles subconical, all of the same type excepting for variation in size, those toward the periphery of the papillose area becoming smaller”. The second pair were described as similar to the first, and those of median and posterior segments as almost smooth, with minute microtubercles. The elytra margins were not described, but were illustrated as smooth, which agrees with present observations.

Type locality

Santa Margarita Island, Baja California, Mexico.

Distribution

Baja California, Mexico (Santa Margarita Island).

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Polynoidae

Genus

Halosydna

Loc

Halosydna nesiotes (Chamberlin, 1919)

Salazar-Silva, Patricia 2013
2013
Loc

Halosydna nesiotes:

Salazar-Silva P 2006: 148
Hanley JR 1987: 160
1987
Loc

Polynoe nesiotes

Hartman O 1938: 122
Chamberlin RV 1919: 74
1919
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