Halosydna glabra Hartman, 1939

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 : 1185-1189

Halosydna glabra Hartman, 1939

( Figure 4 )

Halosydna glabra Hartman, 1939a: 35-36 , plate 4, figures 43–50 (partim); Salazar-Silva, 2006:147.

Lepidonotus hupferi: Hartman, 1939a: 43 (partim) (non L. hupferi Augener, 1918 ).

Halosydna johnsoni ( Darboux, 1899) : Darboux, 1899:246 (partim).

Type material

Holotype LACM-AHF POLY 13, Bahía Concepción, Baja California Sur, Mexico, 26 ◦ 41 ′ 40 ′′ N, 111 ◦ 51 ′ 05 ′′ W, R / V Velero, station 688-37, 21.9 m, mud sand, 16 March 1937, coll. Allan Hancock Foundation. One paratype LACM-AHF POLY 14, Bahía Concepción, Baja California Sur, Mexico, 26 ◦ 41 ′ 40 ′′ N, 111 ◦ 51 ′ 05 ′′ W, R / V Velero III, station 688-37, 21.9 m, mud sand, coll. Hancock Foundation 16 March 1937. One syntype LACM-AHF POLY 1591 of Polynoe reticulata , Pacific Grove, Monterey, California, USA, in tube of Amphitrite or Thelephus sp. 11 July 1896 coll. H.P. Johnson.

Additional material

Mexico: one specimen ( LACM-AHF POLY 2379 ) off Bahía Concepción, Baja California Sur, 26 ◦ 53 ′ 50 ′′ N, 111 ◦ 52 ′ 25 ′′ W, 12 fm, corallines, R / V Velero III, station 683-37, 21.9 m, 15 March 1937 , coll. Allan Hancock Foundation. One specimen ( LACM-AHF POLY 2380 ), Bahía Concepción, Baja California Sur, 26 ◦ 53 ′ 50 ′′ N, 111 ◦ 52 ′ 25 ′′ W, 21.9 m, corallines, R / V Velero III, station 683-37, Id. as Lepidonotus hupferi in Hartman (1939a), 15 March 1937 , coll. Allan Hancock Foundation. Three specimens ( LACM-AHF POLY 2383 ) from Bahía San Carlos, off Guaymas, Sonora, coll. R. Brusca , 24 February 1972 . One specimen ( LACM-AHF POLY 2384 ) from Puerto Lobos , Sonora, Intertidal Rocky, M. E., Niemil, coll. J. Kudenov, No. 251, 20 March 1969 . One specimen ( LACM-AHF POLY 2385 ) Puerto Peñasco, Sonora, Station Beach , MTZ, coll. J. Kudenov, sandy tide pool, under basalt boulder in sand or on rock, 19 January 1973 . One specimen ( LACM-AHF POLY 2386 ) Topolobampo, Sinaloa, on small rocks, No. 12, coll. Univ. Arizona and R. Brusca , in mid-intertidal 26 February 1971 .

Description

Holotype incomplete, with 25 segments, lacking posterior segments. Prostomium bilobed, elongate, without cephalic peaks; facial tubercle rounded, long; two pairs of eyes, anterior pair dorsolateral on widest part of prostomium, posterior pair near posterior prostomium margin; median antenna with ceratophore inserted frontally between prostomial lobes, style subdistally expanded with ring of pigmentation, distally tapering to fine tip; lateral antennae with ceratophores inserted terminally as prolongations of prostomium lobes, styles similar in shape to median antenna but shorter. Palps stout, surface annulate, with short papillae. Pharynx not everted.

Tentacular segment not visible dorsally; tentaculophores ventral to prostomium; tentacular cirri similar in shape to median antenna. Segment 2 projecting anteriorly on to prostomium as short nuchal lobe with two small tubercles.

Thirteen pairs of elytra, on segments 2, 4, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25; surfaces with diffuse pigmentation, margins without fringe. First pair of elytra circular, surface with granular appearance, abundant tubercles ( Figure 4A,B ) and micropapillae. Macrotubercles sclerotized of two kinds: conical, truncated and hemispherical with wrinkled surface ( Figure 4C–F ). Elytra in median and posterior segments oval, surfaces with few micropapillae and microtubercles sclerotized ( Figure 4G,H ) over anterior half.

Parapodia biramous. Notopodia shorter than neuropodia. Neuropodia distally truncate, with protruding acicular tip, prechaetal lobe with small rounded lobe near acicular tip. Dorsal cirri reach neurochaetal tips, similar to antennae and filiform tips. Cirrophores basally expanded. Elytrophores more prominent than dorsal tubercles. Nephridial papillae visible from segment 8, stouter and longer at mid-body.

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

Remarks

The paratype ( LACM-AHF 14 ) is in two pieces, but agrees with the holotype .

Halosydna glabra can be distinguished by the absence of fringe papillae on elytra, and the two kinds of sclerotized macrotubercles: conical, truncate, with wrinkled surfaces, and hemispherical, almost ovoid, and bidentate neurochaetae.

Halosydna glabra was described from Concepción, Bay, Mexico, and recorded also in Panama ( Hartman 1939a). The features of Panama specimens from Station 444–35 do not agree with H. glabra , so its presence in Panama is doubtful.

The specimens of Lepidonotus hupferi from Station 683- 37 in Bahía Concepción ( Hartman, 1939a) agree with H. glabra . This record, together with the new ones from the Mexican Pacific, suggest a distribution restricted to this region.

Type locality

Bahía Concepción , Baja California, Mexico, muddy sand, 26 ◦ 41 ′ 40 ′′ N, 111 ◦ 51 ′ 05 ′′ W .

Distribution

Known from California, USA (Monterrey) ; Sonora, Mexico ( Bahía San Carlos , Puerto Peñasco, Puerto Lobos); Sinaloa (Topolobampo) .

Figures

Figure 4. Halosydna glabra Hartman, 1939a. Holotype LACM-AHF POLY13. (A) First elytron; (B–D) same, macrotubercles; (E, F) same details of the macrotubercles; (G, H) Same, microtubercles.