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 analysis of morphology and six genes (Zrzavet al. 2009) did not clarify the affinities for sternaspids mainly because different approaches gave distinctive topologies or affinities. Hence, their PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/11836068 Bayesian combination indicates Sternaspidae are a sister group to a clade such as sabellidsserpulids, sabellariids, and TrochochaetaSpionidaePoecilochaetus. The unweighted maximumparsimony indicates they kind a clade with sabellariids, which is a sister group to Sabellidae and TrochochaetaSpionidaePoecilochaetus. The weighted maximumparsimony indicates they group with Fauveliopsidae, and together turn into a sister group for Sabellidae Serpulidae, that 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 …………………………………………………………………2 Ventrocaudal shield soft, covered by adhered sediment purchase TA-02 particles; with no ornamentation; introvert hooks tapered; anterior abdomen with 7 segments ……………………………………………………………………….. Caulleryaspis gen. n. Introvert hooks tapered; shield ornamentation incorporates ribs, concentric lines, or both; 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 eight segments …. Petersenaspis gen. n.Genus Sternaspis Otto, 82, restricted http:speciesid.netwikiSternaspis Kind species. Sternaspis thalassemoides Otto, 82, by monotypy. Diagnosis. Sternaspids with introvert hooks falcate, tapered. Preshield area with 7 segments. Ventrocaudal shield stiff, generally with radial ribs and concentric lines. Branchial filaments arranged in discrete branchial plates. Remarks. A species resembling existing Sternaspis was described and illustrated by Janus Plancus in 760 as a sea cucumber under the name Mentula Cucurbitacea Marina inside a book on Mediterranean marine animals (Plancus 760). In that account Plancus indicated that the specimen was from near Rimini, the EmiliaRomagna Italian area bordering the Adriatic Sea. From the description and accompanying illustration, he was undoubtedly describing a sternaspid. Plancus apparently neglected to work with binomial nomenclature in his function and so his name is just not readily available (Petersen 2000).Revision of Sternaspis Otto, 82 (Polychaeta, Sternaspidae)The 
subsequent described species inside the group was Echinorhynchus scutatus Renier (807). Petersen (2000) indicated that Renier’s paper, or what might be identified of it, was rejected as a formal publication by the International Commission of Zoological Nomenclature (ICZN 954), despite the fact that some names have already been officialy validated (Muir and Petersen 200). Ten years just 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.