Isis hippuris, Linnaeus, 1758

Chen, Jei-Ying & Williams, Gary C., 2015, X-ray Microanalysis and the Chemical Elemental Composition of Gorgonian and Pennatulacean Axial Structures (Anthozoa, Octocorallia), Proceedings of the California Academy of Sciences 62 (16), pp. 399-415 : 401-404

Isis hippuris

Figures 1A–B, 2A–C .

The bar chart in Figure 2B presents the ten elements identified from the axial skeleton of the gorgonian Isis hippuris . Three major elements prominently shown in the chart are carbon (21.9 wt%), oxygen (41.71 wt%) and calcium (31.84 wt%); two minor elements are fluorine (1.90 wt%) and magnesium (2.43 wt%); the five remaining trace elements are barely seen from the chart: sodium (0.29 wt%), aluminum (0.07 wt%), sulfur (0.28 wt%), strontium (0.11 wt%) and the rare earth element (REE) ytterbium (0.19 wt%). The summary EDS results for both spectrum 1 (the horizontal site of interest) and spectrum 2 (the vertical site of interest) are listed in Table 1.

TABLE 1. EDS results of spectrum 1 and 2 for gorgonian Isis hippuris axial cross-section surface from Figure 2A . (All results are in weight%)

402 PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES Series 4, Volume 62, Part 2, No. 16

A B

A B

B C

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Figures

FIGURE 2. Energy dispersive spectrometer (EDS) area scan dataset. (A) EDS site of interest BSE image in a cross-sectional view of a gorgonian Isis hippuris axial skeleton acquired by INCA Energy software using the same region as Figure 1, where spectrum 1 was collected across the full span of the maximum horizontal length of the axial surface and spectrum 2 was collected across the full span of the maximum vertical length of the axial surface. Scale bar = 100 μm. (B) Bar chart of the quantitative results from (C) spectrum 1 for reference in that the analytical results of the two sites are fairly similar as presented in Table 1.