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Mostlerium Cheng, 1986 Mostlerium Cheng, 1986: 136. TYPE SPECIES. — Mostlerium unicum Cheng, 1986 (Cheng 1986: 136, pl. 4, fig. 7, 8, 20, 23). AGE AND LOCATION OF TYPE MATERIAL. — Lower Carboniferous, Oklahoma and Arkansas, USA. TAXON CODE. — 226. STATUS. —Junior synonym of Pararchocyrtium Deflandre,1972 (herein). DIAGNOSIS. — “Test as with family [Archocyrtidae] but possessing seven spines on the shell surface; three spines located on the upper hemisphere, of which one slightly lower in position and much shorter; four other spines located on the lower hemisphere surrounding the pylome margin. Cephalis subspherical, perforate having large, circular pylome. Pylome margin having expanded skirt; narrow and imperforate.” (Cheng 1986: 136). REMARKS Noble et al. (2008: 47) note the instability of the position of spines (either as feet or lateral spines) in Pararchocyrtium, and question the validity of using the number of feet as a criterion for genus level distinction in several of the archocyrtid taxa. We synonymize herein., Published as part of Noble, Paula, Aitchison, Jonathan C., Danelian, Taniel, Dumitrica, Paulian, Maletz, Jörg, Suzuki, Noritoshi, Cuvelier, Jessie, Caridroit, Martial & O'Dogherty, Luis, 2017, Taxonomy of Paleozoic radiolarian genera, pp. 419-502 in Geodiversitas 39 (3) on page 474, DOI: 10.5252/g2017n3a4, http://zenodo.org/record/5206585, {"references":["CHENG Y. - N. 1986. - Taxonomic Studies on Upper Paleozoic Radiolaria. National Museum of Natural Science, Taiwan, Special Publication, vol. 1, 310 p.","NOBLE P. J., TEKIN U. K., GEDIK I. & PEHLIVAN S. 2008. - Middle to Upper Tournaisian Radiolaria of the Baltalimani Formation, Istanbul, Turkey. Journal of Paleontology 82 (1): 37 - 56. https: // doi. org / 10.1666 / 06 - 046.1"]}