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Saltwater Archive 1442: Daily Pix FULL SIZE
(For personal use only: NOT public domain)
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Acropora hyacinthus (Dana 1846). Colonies as wide, flat plates, possibly tiered. Branches fine in low wave action environments, fused in brisk ones. Branchlets are fine, upward facing. Axial corallites not exsert, but distinct; radial corallites are cup-shaped. Red Sea images.  /COTW 

Characters: Colonies are wide flat plates and tables or tiered aggregations of small plates. Branchlets are thin and finely structured except where exposed to wave action, when they become closely fused. Branchlets are fine and upward-projecting. Axial corallites are distinct but not exsert. Radial corallites are cup-shaped and form rosettes.

Colour: Uniform cream, brown, grey or green with or without blue (which may photograph pink) growing margins.

Similar Species: See Acropora cytherea, A. tanegashimensis and A. spicifera.

Habitat: Upper reef slopes and outer reef flats.

Abundance: One of the most abundant corals of exposed outer reef slopes of much of the western Pacific.   Red Sea 2019




Stylocoeniella armata (Ehrenberg 1834) /COTW:
Characters: 
Colonies are encrusting. Corallites are widely spaced and form excavations in the coenosteum. Septa are in two equal or subequal cycles. Each corallite has a prominent coenosteum style.
Colour: 
Dark or bright red, brown or green.
Similar Species: 
Stylocoeniella guentheri, which has smaller corallites with less prominent coenosteum styles. See also Madracis kirbyi and Poritipora paliformis.
Habitat: 
Shallow reef environments.
Abundance: 
Rare, cryptic.    N. Sulawesi 2005



The genus Tubipora has four nominal species; though according to Veron, these all probably represent only one valid species, T. musica.; and to others... six, sixteen... Organ  pipe  coral is also a  massive  colonial  animal, readily  recognized  by  its blood-red  cemented  parallel  tubes interconnected  by  horizontal  platforms. As per the Subclass (Octocorallia) bearing,  Tubipora  polyps have eight  tentacles,  arrayed  like feathery palms when exposed. Organ Pipe "coral" is used extensively as ornament as curios and aquarium decor, and I can testify, is very often overlooked underwater for being what it is. Sipadan, Saba, Malaysia 2008
 


The genus Tubipora has four nominal species; though according to Veron, these all probably represent only one valid species, T. musica.; and to others... six, sixteen... Organ  pipe  coral is also a  massive  colonial  animal, readily  recognized  by  its blood-red  cemented  parallel  tubes interconnected  by  horizontal  platforms. As per the Subclass (Octocorallia) bearing,  Tubipora  polyps have eight  tentacles,  arrayed  like feathery palms when exposed. Organ Pipe "coral" is used extensively as ornament as curios and aquarium decor, and I can testify, is very often overlooked underwater for being what it is. N. Sulawesi, Indo. 2005.
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