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Archive 1221: Daily Pix FULL SIZE
(For personal use only: NOT public domain)
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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 granulosa Klunzinger 1879

Characters: Polyps are circular, up to 135 millimetres diameter and flat or with a central arch. Septa are thick and wavy, with finely granulated margins. Tentacular lobes are wide, causing the wavy shape of the septa. Costae are fine. The undersurface has pits between the costae.

Colour: Usually brown.

Similar Species: Fungia scabra. See also Cycloseris costulata.

Habitat: Reef slopes and lagoons.

Abundance: Usually uncommon.

Taxonomic Note: Called Pleuractis granulosa by Gittenberger, Reijnen and Hoeksema (2011) from molecular data. However, this requires further study.

 Here off Hawai'i's Big Island at night. 
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