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Petrushevskaya 1971


Figure 23

Structure of central radiolarian skeletons.
I) Heliaster hexagonium (Hck.); II) Stigmosphaera cruciata Holl. Enj.; III) Hexastylus horridus Holl. Enj.; IV) Pylonidae (according to Kozlova, 1967b); V) Exentroconcha (=Octodendron) cubicentron (Hck.); VI) Lonchosphaera spicata Popofsky; exemplary scheme of Nassellaria (original).