Semiodera salazarae Salazar-Vallejo 2012, n. sp.
Creators: name: Salazar-Vallejo, Sergio I.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Flabelligeridae
Semiodera
Semiodera salazarae

description: <i>Semiodera salazarae</i> n. sp. Figure 12 <b>Type material. Eastern Tropical Pacific,</b> <b>Mexico</b>. Holotype (ECOSUR 138) and paratype (ECOSUR 139), Playa La Manzanilla (20°44'35" N, 105°23'14.8" W), Nayarit, mixed bottoms, 1 m depth, 29 Nov. 2004, P. Salazar, coll. (paratype mature female, anterior fragment, 7 mm long, 2 mm wide, cephalic cage broken, 2.5 mm long, 29 chaetigers; oocytes 120–150 µm). <b>Description.</b> Holotype (ECOSUR 138) complete, dark yellowish, recurved dorsally (Fig. 12A). Body cylindrical, tapering posteriorly into a long, thin cauda; 12 mm long, 2 mm wide, cephalic cage 4 mm long, 55 chaetigers. Tunic thin, without sediment cover; body papillae large, capitate, arranged in 5–7 rows per segment (Fig. 12D), without interramal papillae. Anterior end not exposed; not dissected to avoid further damage. Cephalic cage chaetae partially broken, twice as long as body width. Chaetigers 1–2 involved in cephalic cage; chaetae arranged in short rows, about the body corners; chaetiger 1 with 4 noto- and 3 neurochaetae per ramus, chaetiger 2 along same axis as chaetiger 1, with 3 noto- and 2 neurochaetae per ramus. Anterior dorsal margin of chaetiger 1 projected anteriorly (eroded in paratype), without papillae. Anterior chaetigers without especially long papillae (paratype with chaetiger 1 with longer papillae in neurochaetal bases). Chaetigers 1–2 slightly shorter than chaetiger 3. Sand cemented anterior shield (Fig. 12B–D) extending posteriorly into chaetiger 6 (5 in paratype), and ventrally along chaetigers 1–2, reaching the midventral line. Chaetal transition from cephalic cage chaetae to body chaetae gradual; pseudocompound hooks in chaetigers 3–8. Falcate simple neurohooks from chaetiger 9. Gonopodial slits not visible. Parapodia poorly-developed, chaetae emerge from body wall. Parapodia lateral, median neuropodia ventrolateral. Noto- and neuropodia without projections, lobes or longer papillae. Noto- and neuropodia well separated from each other. Median notochaetae variously broken, about as long as ¼–1/5 body width, multiarticulate capillaries, articles short basally, medium sized along a short region, long throughout most of chaeta. Neurochaetae multiarticulate capillaries in chaetigers 1–2; neuropodia 3–8 with long pseudocompound hooks, 2 per ramus, often broken (Fig. 12E, insert), decreasing in size posteriorly; falcate golden neurohooks from chaetiger 9, arranged in transverse rows, 2 per ramus in most chaetigers, including subterminal ones. Hooks golden, homogeneously pigmented, with many, delicate transverse bands (Fig. 12F). Posterior end tapering into a hemispheric lobe; pygidium with terminal anus, no anal cirri. <b>Etymology.</b> The species name is derived from my colleague Dr. Patricia Salazar-Silva in recognition of her efforts to encourage taxonomic studies of marine invertebrates in tropical Mexico, and because she collected these described specimens.. <b>Type locality.</b> Western Mexico. Playa La Manzanilla, Nayarit, 1 m depth, mixed bottoms <b>Remarks.</b> <i>Semiodera salazarae</i> <b>n. sp.</b> groups with <i>S. nishi</i> <b>n. sp.</b> and <i>S. treadwelli</i> <b>n. sp.</b> as all have a poorlydeveloped dorsal shield and two neurohooks in median chaetigers. Unlike the other species, <i>S. nishi</i> has neurohooks from chaetiger 8 (as opposed to chaetiger 9), rendering <i>S. salazarae</i> more closely allied to <i>S. treadwelli.</i> These two species differ in that the dorsal shield of <i>S. salazarae</i> is covered with large densely packed sand grains, whereas in <i>S. treadwelli</i> they are small, sparse particles. Further, the ventral extension of the dorsal shield differs because in <i>S. salazarae</i> the shield lateral projections are ventrally connected, whereas in <i>S. treadwelli</i> these projections do not reach the midventral line. <b>Distribution.</b> Apparently restricted to the Mexican Central Pacific coasts in the state of Nayarit, in intertidal mixed bottoms.
description: Published as part of <i>Salazar-Vallejo, Sergio I., 2012, 3562, pp. 1-62 in Zootaxa 3562</i> on page 33