Azooxanthellate Scleractinia (Cnidaria: Anthozoa) - Western ...

378
and a tendency to have a curved corallurn, instead
of being straight.
Distribution
Western Australia: continental slope of
northwestern coast from Kimberley to Rowley
Shoals; 224-260 m. Elsewhere: Indonesia (Banda
Sea, Arafura Sea); 176-263 m (Cairns and
Zibrowius 1997).
Etymology
The species name decamera (Latin decem, ten +
camera, chamber) alludes to the decameral
symmetry of the species resulting in ten equal
chambers, or systems, of septa.
Genus Crispatotrochus Tenison Woods, 1878b
Crispatotrochus rugosus Cairns, 1995
Crispatotrochus rugosus Cairns, 1995: 57, pI. 13, figs.
a-b.-Cairns and Zibrowius, 1997: 104.
New Record
Soela: stn 01/84/55, 6, WAM 560-84 and 453--96.
Distribution
Western Australia: continental slope off Cape
Leveque, Dampier Land; 296-298 m. Elsewhere:
Philippines; Malaysia; Kermadec Islands; Lord
Howe 5eamount Chain; 142-508 m (Cairns and
Zibrowius 1997).
Crispatotrochus inornatus Tenison Woods, 1878b
Figure 2 g-h
Crispatotrochus inornatus Tenison Woods, 1878b:
309-310, pI. 6, figs. 2a-52>53>54>55. Holotype contains 66 septa:
5 half-systems with no 55, 5 having 1 pair of
55, and 2 having 2 pairs of 55. 51 slightly
exsert (about 1.2 mm), with straight,
thickened inner edges reaching to columella.
52 about 4/5 width of the 51, also having
straight inner edges. 53 4/5 width of the 52,
with straight inner edges. 54 half width of the
53, unless flanked by a pair of 55, in which
case they are almost as large as the 53, the 55
being half the width of the 54. Septal faces
bear numerous very small, low granules,
resulting in almost smooth, planar faces.
Fossa deep, containing a papillose columella
composed of 1-10 slender, irregularly-shaped
pillars.
Remarks
Only one other Recent species is known in this
genus, O. rotundifolia (Milne Edwards and Haime
1848a), endemic to the western Atlantic at depths
of 46-640 m (Cairns 1979). O. circularis differs in
having a circular calice (that of O. rotundifolia is
elliptical); 51 that are wider than the 52 (51 and
52 are equal in width in O. rotundifolia); a
nonreinforced base (the base of O. rotundifolia is
often reinforced with rings of exothecal rootlets);
and in having fewer septa (66 vs 96+), although
larger coralIa of O. circularis may prove to have a
complete fifth cycle.
Distribution
Western Australia: continental slope of
northwestern coast off Port Hedland and south of
Rowley Shoals; 201-404 m; 9.6°-16.2°C.
Etymology
This species name circularis (Latin circularis,
round) refers to the round calice of this
species.