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Trigonosphaera Feng in Feng, Gu, Jiang & Jin, 2004 Trigonosphaera Feng in Feng, Gu, Jiang & Jin, 2004: 137. TYPE SPECIES. — Trigonosphaera calvata Feng in Feng, Gu, Jiang & Jin, 2004 (Feng et al. 2004: 142, pl. 3, fig. 1-7, pl. 4, fig. 1). AGE AND LOCATION OF TYPE MATERIAL. — Upper Changhsingian (uppermost Permian), Dongpan section, Dalong Formation, Southern China. TAXON CODE. — 306. STATUS. — Valid. DIAGNOSIS. — “Test consists of a single round-triangular cortical shell, without medullary shell and internal spicule. The shell is composed of two spongy layers. The two layers are similar in thickness, but different in structure: the inner layer is comprised of large, irregular pore frames and the outer layer, of small, irregular pore frames. Numerous beams connect the two layers.” (Feng in Feng et al. 2004: 137). REMARK Some centrally directed remains of the inner layer seem to suggest that there existed a central structure that was later dissolved by fossilization., 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 pages 489-490, DOI: 10.5252/g2017n3a4, http://zenodo.org/record/5206585, {"references":["FENG Q. L., GU S., JIANG M. & JIN Y. 2004. - Two new radiolarian genera from the uppermost Permian of southern China. Revue de Micropaleontologie 47 (3): 135 - 143. https: // doi. org / 10.1016 / S 0035 - 1598 (04) 00033 - 9"]}