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Saltwater Archive 1440: Daily Pix FULL SIZE
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Hydnophora rigida (Dana 1846). Thin, flattened, pointed branches. Fiji 2017.

Merulina scabricula Dana 1846
Characters: Colonies are laminar or subarborescent, with these different growth-forms characteristically occurring together in large colonies. Valleys are short, straight, and spread in a fan before dividing. They radiate from the colony centre on flat surfaces, but are highly contorted on branches. Flat surfaces often have concentric growth lines. Tentacles are extended only at night. Well developed colonies always have some branch development.
Blue or pale brown with blue margins (which may photograph pink). Tentacles are extended only at night.
Similar Species: 
Merulina ampliata, which has thicker and coarser skeletal structures. (COTW) NSUL 2005.

Out last March diving; well, snorkeling here; in Huahine. Wondered what this is... Have dived (several times) the type locality... this could be an example of the at-times high polymorphism of stony corals... vis a vis local conditions of light, current, food availability.... on p. 136 of "guide: des recifs coralliens de Tahiti et ses iles" and https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:a2481237-3b76-41f9-b802-15f489ff4484 appears to be Porites rus Forsskal 1775, Plate and Pillar Coral. Variable in shape as its common name points to. Upright columns more shallow to gorgeous plates deeper, more calm waters. Gray to brown in color, often with yellow polyps that have wider spaced calyces, raised areas between polyps. What say you? 2018

Acropora maryae possibly Veron 2000, /COTW:
Characters: Colonies are usually upright compact bushes, but may form thick plates. Branches are short and sub-branches are frequent. Axial and incipient axial corallites are large and dome-shaped, with thick walls. They may become long and tubular. Radial corallites are small and inconspicuous. All corallites are smooth and rounded. The coenosteum is smooth.Colour: Usually uniform blue (which may photograph pink) or cream.Similar Species: Acropora loripes, which has more exsert (pocket-like) radial corallites and is not uniformly coloured. See also A. rosaria and A. squarrosa.Habitat: Upper reef slopes.Abundance: Common. Sinai 2019
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