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Archive 1221: Daily Pix FULL SIZE
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Ctenactis echinata (Pallas 1776). Both septa and costal (top and bottom skeletal lines) bear teeth. One mouth. Fiji. 

Fungia (Cycloseris) costulata. This species is distinguished by its straight, non-wavy septal walls and that they decidedly  thicken toward the mouth/center. Occur in sand, mud. West Pacific. N. Sulawesi pix. 

Cycloseris tenuis  (Dana 1846), Thin flat polyps. Uniform septa, but in obvious different orders, thick irregular costae underneath. N. Sulawesi pic.

Fungia concinna Verrill 1864, Disk Coral. Flat, circular skeletons to six inches in diameter. Septal teeth small. Very small tentacular lobes or none. Underside lacks pits. Here off Hawai'i's Big Island at night. 
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