Stylactinosphaera Noble, 1994

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, Geodiversitas 39 (3), pp. 419-502 : 489

Stylactinosphaera Noble, 1994

Stylactinosphaera Noble, 1994: 36 .

TYPE SPECIES. — Stylactinosphaera prima Noble, 1994 ( Noble 1994: 36, pl. 4, fig. 18-19).

AGE AND LOCATION OF TYPE MATERIAL. — Silurian, zone 1 and lower zone 2 of Noble (1994), Payne Hills, Marathon uplift, west Texas, USA.

TAXON CODE. — 305.

STATUS. — Valid.

DIAGNOSIS. — “Latticed medullary shell surrounded by thickened, spinose cortical shell with six to eight robust primary spines. Rodshaped primary bars extend from cortical shell to latticed, subrounded medullary shell. Primary spines are conical with shallow grooves and alternating ridges at proximal end. Grooves and alternating ridges partially extend up the length of the spine. The cortical shell is covered by numerous secondary spines (20 or more per hemisphere) that are less than 75% the size of the primary spines. Grooves and alternating ridges occur at proximal end of secondary spines and partially extend up the spine length.” ( Noble 1994: 36).