Aged; integument removed from quite a few physique regions; ventrocaudal shield previously removed.
Aged; integument removed from quite a few physique regions; ventrocaudal shield previously removed. Introvert devoid of integument more than the initial chaetigers, abdomen with integument and body wall broken laterally. Physique papillae tough to determine as a consequence of the poor situation PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/18686015 of holotype (Fig. 2A). Physique 8 mm extended, 5 mm wide, about 29 segments. Prostomium hemispherical, opaque, tan in colour. Peristomium rounded, slightly raised at position in the mouth, without papillae. Mouth oval, covered by papillae, extends from anterior edge of segment two nearly to prostomium (Fig. 2B). First 3 chaetigers with about six to ten large, and five or extra smaller sized, bronze, broadly separated, slightly falcate hooks; each and every with subdistal darker area (Fig. 2A, B). Genital papillae flattened, brief protrude ventrally from intersegmental groove amongst segments 7 and 8. Preshield area with 7 segments, with out fine capillary chaetae. 
Ventrocaudal shield previously removed, broken into 3 pieces; surface pale brown; ribs barely visible, concentric lines visible; suture likely indistinct (Fig. 2C). Anterior margins rounded; anterior depression shallow; anterior keels most likely not exposed. Lateral margins medially expanded, lowered posteriorly. Fan truncate, margin crenulated, median notch shallow, or indistinct (shield plates previously separated). Marginal shield chaetal fascicles involve ten lateral ones, chaetal pattern unknown, and 5 posterior fascicles, chaetal pattern unknown. Peg chaetae short, with a broad base in cross section, emerge from cuticle on a slightly raised mound. Further chaetae delicate, in between peg chaetae and very first bundle of posterior chaetae. Branchiae lost; nature of branchial plates not determined. Remarks. The holotype is in poor situation with most of the cuticle missing, exposing the musculature under. It is a large specimen which exaggerates a few of the functions for instance those with the shield and colouring in the introvert hooks. Caullery reported six chaetal fascicles in total with 8 situated posteriorly; on the other hand, since the shield was separated, it seems he counted the groups of chaetae as they appeared under the shield. Further it would have been difficult to figure out correctly irrespective of whether the delicate fine group is part of posterior or lateral fascicles. The shield of S.rietschi features a posterior margin straight, at same level as margin of shield resembling S. princeps, S. spinosa, S. thalassemoides and S. thorsoni sp. n. As indicated above, S. spinosa differs in the others in that its shield is a lot wider than long and by having exposed its anterior keels. Additional, S. thorsoni has more abundant, strawcoloured, delicate introvert hooks, whereas the remaining species have fewer, thicker, darker hooks. Also, you will discover no concentric lines on the shield of S. princeps in contrast to S. thalassemoides and S. rietschi. These two species F16 chemical information differ since in S. rietschi the shield lateral margins are rounded, markedly expanded medially, whereas in S. thalassemoides they are rather straight, not markedly expanded medially. Distribution. Only recognized from the type locality, off Wokam Island, Indonesia, in about 788 m depth.Kelly Sendall Sergio I. SalazarVallejo ZooKeys 286: 4 (203)Figure two. Sternaspis rietschi Caullery, 944, holotype (ZMA 500) A Total specimen, oblique, lateral view (insert: hooks from chaetiger 3) B Same, anterior finish, frontal view C Ventrocaudal shield, pieces previously broken, frontal view. Body as much as 35 mm extended, 8 m.