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Archive 1228: Daily Pix FULL SIZE
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Leptoseris hawaiiensis Vaughan 1907. Colonies as encrusting laminae. Corallites raised irregularly, rounded. Septae costae even. Green or brown in color. East Africa, Red Sea to Hawai'i, Tuamotus and tropical East Pacific. Nuka Hiva, Marquesas, Polynesia pic. 
Pavona varians Verrill 1864. Colonies encrusting to laminar, showing short, irregular valleys.  Hawai'i images. /COTW:

Characters: Colonies are submassive, laminar or encrusting or various combinations of these. Corallites are in short irregular valleys, or are aligned between ridges perpendicular to margins, or are irregularly distributed on flat surfaces. Septo-costae are in alternating orders.

Colour: Yellow, green or brown.

Similar Species: Pavona venosa, which has similar corallites but walls between valleys (collines) are acute, septa are generally in three orders, columellae are less developed and septa more widely spaced.

Habitat: Most reef environments.

Abundance: Common.

 Kona, HI pic. 

An Agariciid, genus Leptoseris? Encrusting colonies with corallites distributed randomly, while forming mound-like ridges concentrically. Redang, Malaysia photo.
Pachyseris rugosa (Lamarck 1801). Upright, irregular growth. Plates growing together. Columellae as wall-like lobes. Massive sometimes in shallow water to upright blades in deeper, calmer waters. Aquarium images. /COTW:

Characters: Colonies are upright, irregular, usually contorted, anastomosing bifacial plates. They are often over one metre across. Columellae are wall-like lobes.

Colour: Deep bluish-grey or brown.

Similar Species: Pachyseris gemmae. See also P. involuta.

Habitat: May develop into large mound-shaped colonies in shallow water but smaller colonies occur in a wide range of habitats including those exposed to strong wave action.

Abundance: Common. Cebu, P.I.

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