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053800), with physique cream to light tan, occasionally greyish (Fig. 5A, B
053800), with physique cream to light tan, sometimes greyish (Fig. 5A, B). 1st six segments smooth using a few minute cuticular papillae extensively and evenly spaced. Remaining segments more papillate and opaque in look. Segments seven and eight slightly far more opaque and dense than preceding ones, with stout cuticular papillae specially close to genital papillae, some cuticular papillae with smaller PubMed ID: grains of sediment adhered to bases. Body 5.5 mm long, five.0 mm wide (other specimens up to 22 mm lengthy, 7 mm wide), about 29 segments. Prostomium hemispherical, opalescent, translucent, often with crescent shaped red eyespots laterally on smaller sized folks (Fig. 5C, insert). Peristomium round, without papillae. Mouth oval, covered by papillae, extending from base of prostomium to anterior edge of second segment. Very first three chaetigers with 84 light bronze, broadly separated, slightly falcate introvert hooks per bundle, every single with subdistal dark places (Fig. 5C). Genital papillae protrude ventrolaterally from intersegmental groove involving segments 7 and eight. Preshield area with 7 segments, with papillae evenly spaced, slightly denser than on anterior segments, while less so ventrally, and in single rows of clusters of quick filaments closer to ventrocaudal shield, specially on dorsal surface, seldom showing delicate quick capillary chaetae protruding laterally from body wall. Ventrocaudal shield with concentric lines, slightly ribbed; suture extended throughout shield (restricted for the anterior region in bigger specimens). Anterior margins rounded; anterior depression deep; anterior keels not exposed (Figs B, 2, 5B, D). Lateral margins gently rounded (straighter in larger specimens), not expanding posteriorly. Fan truncate, pretty much straight in juveniles, from time to time with median notch, becoming crenulated in bigger specimens. Marginal chaetal MedChemExpress Eptapirone free base fascicles incorporate 0 lateral ones (Fig. 5E), chaetae ovally arranged, and 5 posterior fascicles, chaetae within a linear arrangement. Peg chaetae on conical extensions emerging under most prominent oblique rib with the shield. Peg chaetae with stout base in cross section; a little fascicle of delicate capillary chaetae (pegassociated capillary chaetae) in between peg chaetae and initial fascicle of posterior chaetae. Branchiae several, thick, coiled, slender, lengthy, protruding from two oval plates, separated by a wide angle, on either side of anus. More fine, long filamentous papillae extending to lateral and posterior margins of shield.Revision of Sternaspis Otto, 82 (Polychaeta, Sternaspidae)Figure 5. Sternaspis affinis Stimpson, 864, neotype (RBCM 0053800) A Dorsal view B Ventral view C Anterior end, frontal view (insert: juvenile, prostomium with eyes) D Ventrocaudal shield, frontal view e Posterior area, lateral view. Bars: A mm B . mm C 0.eight mm D 0.6 mm E 0.7 mm.Neotype locality. British Columbia, Canada, Strait of Georgia. Remarks. It appears that S. affinis has not been reported due to the fact 875. However, a lot of collections hold specimens collected over the last hundred years of what seems to become the only species present along the northeast Pacific coast of North America, in the Beaufort Sea to California, and in to the Gulf of California. These have been labelled either as S. scutata or S. fossor. The original description by Stimpson is short and only involves a scant comparison with the cuticle using the Atlantic species, S. fossor. As Stimpson’s description agrees with all the characters on the specimens located alo.

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Author: DNA_ Alkylatingdna


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