| P number: | P550160 |
|---|---|
| Caption: | Halysites catenulaia, a fossil coral. |
| Description: | Halysites is a tabulate coral with thickened walls and arranged in rows with the corallite walls united with that of its neighbours. It contributed to reef building in the warm, shallow seas of the mid -Silurian (about 425 million years ago) sea of England. The corallites of Halysites catenulaia are tube-like when viewed from the side, but rounded to ovoid in cross-section. The corallum form anastomosing strings of corallites when viewed from the top (as illustrated). Very thin septal spines may occasionally occur. Like all tabulate corals, Halysites catenulaia has numerous tabulae stacked one above the other throughout the tube-like corallite. Unlike rugose corals, tabulate corals have a simple corallum. The corallites form as a cluster of long slender tubes. They are built up with a stack of tabulae (corallite floors), but there are no septa or dissepiments. They are all colonial in form. |
| Photographer: | Unknown |
| Copyright statement: | Unknown |
| Orientation: | Landscape |
| Size: | 565.44 KB; 1001 x 923 pixels; 85 x 78 mm (print at 300 DPI); 265 x 244 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Fossils |
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