azooxanthellate

Indo-West Pacific

New Caldonia waters from 20°31’S to 23°54’S, 699-830 m (Kitahara & Cairns, 2009); Indian Ocean off Durban, off Mozambique, off Zanzibar (Cairns & Keller 1993), 510-1986 m, including Maldive islands (Alcock 1898; Gardiner & Waugh 1938), Gulf of Aden (Gardiner & Waugh 1938), off Sri Lanka (Van der Horst 1931), and off Tanzania (Gardiner & Waugh 1938); Pacifi c Ocean off southeastern Japan (Cairns 1994), 799-1187 m, off Philippines, Indonesia (Flores and Celebes Sea), Malaysia (Alcock 1902a, c; Cairns & Zibrowius 1997), 210-1719 m, Vanuatu and Wallis and Futuna region (Cairns 1999), 1050-1160 m, Australia region off Queensland (Cairns 2004), 143-1192 m.

Corallum circular to slightly elliptical with lancetted calicular margin. Each apex correspond to those C4 fl anked by C5. Base normally slightly conical and pointed in centre. Costae more prominent near calicular edge as low serrated ridges. C1-3 originates in centre of the base, C4 present only near calicular edge, and C5 slightly wider than C4. Corallum white to reddish-brown. Septa hexamerally arranged in 5 cycles (S1-2>S3> S4>S5). S1-2 do not fuse to any adjacent septa, each bearing a palus about 1-2.5 mm wide. S3 less exert with irregularly shaped paliform lobe, sometimes P3 wider than P1-2, but some specimens present P3 very small. Adjacent to the P3, near columella, sometimes 2 or 3 small paliform teeth are present. S4 less wide and exsert than S3 but bear a wide and tall palus, producing a prominent palar crown encircling columella. Each P4 fuses to the fl anked P3 near columella. S5 fuses to the axial edge of adjacent P4 close to basal theca through a long and porous lamella. Fossa extremely shallow containing a welldeveloped papillose columella composed of several interconnected rods.

Depth range based on 113 specimens in 1 taxon.
Water temperature and chemistry ranges based on 60 samples.

Environmental ranges
  Depth range (m): 210 - 2312
  Temperature range (°C): 2.456 - 15.254
  Nitrate (umol/L): 12.959 - 40.729
  Salinity (PPS): 34.415 - 35.184
  Oxygen (ml/l): 1.733 - 4.370
  Phosphate (umol/l): 0.880 - 3.661
  Silicate (umol/l): 4.745 - 147.104

Graphical representation

Depth range (m): 210 - 2312

Temperature range (°C): 2.456 - 15.254

Nitrate (umol/L): 12.959 - 40.729

Salinity (PPS): 34.415 - 35.184

Oxygen (ml/l): 1.733 - 4.370

Phosphate (umol/l): 0.880 - 3.661

Silicate (umol/l): 4.745 - 147.104
 
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