And 1 hundred years later, it was regarded as forming an
And 1 hundred years later, it was regarded as forming an independent order by Dales (962). This proposal was accepted by Fauchald (977), Pettibone (982), George and HartmannSchr er (985), and HartmannSchr er (996). An evaluation of morphology and six genes (Zrzavet al. 2009) didn’t clarify the affinities for sternaspids mainly because various approaches gave diverse topologies or affinities. As a result, their PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/11836068 Bayesian combination indicates Sternaspidae are a sister group to a clade which includes sabellidsserpulids, sabellariids, and TrochochaetaSpionidaePoecilochaetus. The unweighted maximumparsimony indicates they type a clade with sabellariids, that is a sister group to Sabellidae and TrochochaetaSpionidaePoecilochaetus. The weighted maximumparsimony indicates they group with Fauveliopsidae, and collectively become a sister group for Sabellidae Serpulidae, which is a sister group to Sabellariidae and the other grouped taxa of former analysis. Essential to genera of Sternaspidae Carus, 863 two Ventrocaudal shield stiff …………………………………………………………………two Ventrocaudal shield soft, covered by adhered sediment particles; with no ornamentation; introvert hooks tapered; anterior abdomen with 7 segments ……………………………………………………………………….. Caulleryaspis gen. n. Introvert hooks tapered; shield ornamentation involves ribs, concentric lines, or each; anterior abdomen with 7 segments …..Sternaspis Otto, 82, restricted Introvert 
hooks subdistally expanded or spatulate; shield ornamentation with ribs but no concentric lines; abdomen with 8 segments …. Petersenaspis gen. n.Genus Sternaspis Otto, 82, restricted http:speciesid.netwikiSternaspis Type species. Sternaspis thalassemoides Otto, 82, by monotypy. Diagnosis. Sternaspids with introvert hooks falcate, tapered. Preshield region with 7 segments. Ventrocaudal shield stiff, usually with radial ribs and concentric lines. Branchial filaments arranged in discrete branchial plates. Remarks. A species resembling present Sternaspis was described and illustrated by Janus Plancus in 760 as a sea cucumber beneath the name Mentula Cucurbitacea Marina within a book on Mediterranean marine animals (Plancus 760). In that account Plancus indicated that the specimen was from near Rimini, the EmiliaRomagna Italian region bordering the Adriatic Sea. From the description and accompanying Glycyl-L-prolyl-L-arginyl-L-proline acetate web illustration, he was undoubtedly describing a sternaspid. Plancus apparently neglected to make use of binomial nomenclature in his work and so his name is not obtainable (Petersen 2000).Revision of Sternaspis Otto, 82 (Polychaeta, Sternaspidae)The following described species inside the group was Echinorhynchus scutatus Renier (807). Petersen (2000) indicated that Renier’s paper, or what might be located of it, was rejected as a formal publication by the International Commission of Zoological Nomenclature (ICZN 954), despite the fact that some names have been officialy validated (Muir and Petersen 200). Ten years immediately after the account by Renier, the very first valid description of a species was published by Ranzani (87) as Thalassema scutatus. Otto (82) proposed Sternaspis to replace Thalassema Ranzani, 87, and described S. thalassemoides, which he regarded as closely allied to T. scutatus. Otto indicated that Thalassema had been already employed by Pallas (and replaced by Leach 86, to Thalessema). The form species for Sternaspis has been regarded as Echinorhynchus scutatus Renier, 807 by Hartman (959), Faucha.