Ld (977) and Gilbert (984). This is incorrect as a result of the rejection of
Ld (977) and Gilbert (984). This is incorrect as a result of the rejection on the publications by Renier, and since the only species integrated inside the proposal on the new genus was S. thalassemoides Otto, 82. Consequently, this have to be regarded because the type species by monotypy. While Ranzani had understood properly the physique ends, Otto confused them due to the fact he thought the shield was anterior. PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/11836068 Clapar e (869) praised Krohn (842) and M ler (Mueller 852) for setting it straight as to which end of sternaspids was anterior and which posterior. Having said that, it seems that the first indication of your correct body polarity was made by de Blainville (828:5000, Pl. 26, unnumb.), because he purchase Tangeretin corrected the illustrations, while he repeated the confusions relating to the body characteristics. Sternaspis differs from Petersenaspis gen. n. since the ventrocaudal shield is stiff, the introvert hooks are tapered, not subdistally expanded, and the branchial filaments are arranged in discrete plates, not loosely arranged. Sternaspis differs from Caulleryaspis gen. n. since the latter includes a soft ventrocaudal shield with abundant sediment particles on it. Sternaspis involves, apart from the kind species, S. thalassemoides Otto, 82 reinstated, from the Mediterranean Sea, S. affinis Stimpson, 864 from the Northeastern Pacific, S. africana Augener, 98, new status, from Western Africa, S. andamanensis sp. n. in the Andaman Sea, S. costata Marenzeller, 879 from Japan, S. fossor Stimpson, 853 from the Northwestern Atlantic, S. islandica Malmgren, 867 from Iceland, S. maior Chamberlin, 99 from the Gulf of California, S. princeps Selenka, 885 from New Zealand, S. rietschi Caullery, 944 from abyssal depths about Indonesia, S. scutata (Ranzani, 87) from the Mediterranean Sea, S. spinosa Sluiter, 882 from Indonesia, and S. thorsoni sp. n. in the Arabian Gulf. In Petersenaspis gen. n in addition to the sort species, P. capillata (Nonato, 966) comb. n. from Central and Southern Brazil, the genus also involves P. palpallatoci sp. n. in the Philippine Islands. Caulleryaspis gen. n. includes C. gudmundssoni sp. n. from Iceland and C. laevis (Caullery, 944) comb. n. from Indonesia. Crucial to species of Sternaspis Otto, 82 (distribution in parenthesis soon after studied components) two Ventrocaudal shield’s fan using a distinct median notch ………………………..2 Ventrocaudal shield’s fan continuous, devoid of a distinct median notch…..6 Shield with radial ribs and concentric lines distinct ……………………………….Kelly Sendall Sergio I. SalazarVallejo ZooKeys 286: 4 (203)three(two) four(3) 5(3) 6 7(6) 8(7) 9(eight) 0(9) (6) Shield with radial ribs distinct, concentric lines barely visible…………………… ………….S. maior Chamberlin, 99 (Eastern Pacific, Gulf of California) Fan with median notch shallow …………………………………………………………four Fan with median notch deep; shields ordinarily with concentric bands ………..five 
Shield with distinct concentric bands; primary rib and posterior corners directed posteriorly……….. S. affinis Stimpson, 864 (Northeastern Pacific Ocean) Shield with out concentric bands; posterior corners directed laterally ……… ……………………………………………………………………………………….. S. scutata (Ranzani, 87) (Mediterranean Sea and Northeastern Atlantic Ocean) Shield with posterior corners distinct …………………………………………………… ………….. S. costat.