Pillary chaetae protruding laterally from body wall in some compact specimens.
Pillary chaetae protruding laterally from body wall in some modest specimens. Ventrocaudal shield ribbed; juveniles with handful of concentric lines darker than the background shield colour, normally covered by sediment (Fig. 9B), concentric bands far better defined in bigger GNE-495 supplier specimens (Fig. 9D); suture extended throughout shield. Anterior margins rounded; anterior depression deep; anterior keels not PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/11836068 exposed. Lateral margins straight in smaller sized specimens, curved in larger specimens, expanding posteriorly. Fan slightly projected beyond posterior corners, smooth in juveniles, crenulated in larger specimens, with a median shallow notch (Figs B, 9B).Kelly Sendall Sergio I. SalazarVallejo ZooKeys 286: 4 (203)Marginal chaetal fascicles include 0 lateral ones, chaetae in an oval arrangement, and 6 posterior fascicles, chaetae arranged in an roughly ventrodorsal line. Lateral chaetae light bronze proximally along the shafts, grading to just about clear in the distal ends. Peg chaetae quick, normally obscured by adhered sediment or filamentous papillae amongst bases of chaetae. More short delicate capillary chaetae in 
between peg chaetae and 1st posterior fascicle of shield chaetae. Branchiae stout, coiled, protruding from two oval, obliquely set plates, one particular on either side of anus. Lots of lengthy filamentous interbranchial papillae with sediment particles attached. Variation. The ventrocaudal shield is covered with sediment which is adhered to thin papillae in smaller sized specimens. Bigger specimens have sediment particles much less firmly adhered and may be brushed off. The pigmentation pattern is banded with concentric lines welldefined but ribs barely prominent; the fan is slightly projected and markedly cleft (Fig. 9E G), and the posterior margin is smooth in smaller specimens becoming slightly crenulated in bigger specimens. Remarks. The taxonomic status of Sternaspis fossor Stimpson, 853 needs clarification because it has been regarded as a extensively distributed species, or has been taken either as a senior synonym in the Northwestern Pacific species, S. affinis Stimpson, 864, or as junior synonym for the Mediterranean species, S. scutata (Ranzani, 87). In an effort to clarify this scenario, a neotype has been proposed together using the above description and illustrations (ICZN 999, Art. 75.three.5.3.3). As for S. affinis (see above), Stimpson’s original material was destroyed in the course of the wonderful Chicago fire in 87. Regardless of the truth that the original description was brief, S. fossor is apparently the only species living in the variety locality area, and we are confident that the neotype corresponds for the species (ICZN 999, Art. 75.three.5). The above proposed neotype was collected nearby the variety locality, Grand Manan Channel (ICZN 999, Art. 75.three.six), though there were no details about depth or sediment sort. The neotype has been deposited in National Museum of Natural History (ICZN 999, Art. 75.3.7). Sternaspis fossor resembles S. affinis, S. islandica and S. maior due to the fact their shields are provided with rounded anterior margins, the lateral margins are slightly rounded, as well as the posterior margins are slightly expanded beyond the posterolateral corners. Nevertheless, S. islandica differs by getting an incredibly shallow anterior depression, whereas the two other species possess a deeper anterior depression. The 3 other species differ specifically inside the ornamentation with the shield surface because in S. fossor the radiating ribs and posterolateral corners are poorly created, barely visibl.