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. 2017 Aug 16;12(8):e0181413. doi: 10.1371/journal.pone.0181413

Fig 7. Morphology and silicification of initial frustule components of P. staurophorum.

Fig 7

(A) Closed hoop of the initial band. (B) Initial epivalve. (C) Corresponding spectrum from B showing relatively weak degree of silicification. (D) Fragment of initial girdle band. (E) Corresponding spectrum from D showing degree of silicification similar to the initial valve in B and C. (F) A more typical, strongly silicified hypovalve. (G) Corresponding spectrum from F with silica peak nearly three times the height (note difference in y-axis scale) of those from initial epitheca in B through E.