dcsimg

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Paracyathus pruinosus Alcock, 1902

Paracyathus pruinosus Alcock, 1902c:18, 19, pl. 3: figs. 17, 17a.—Van der Horst, 1931:9, pl. 1: figs. 9,11; pl. 2: fig. 6.—Yabe and Eguchi, 1942b:126, pl. 11: fig. 1.—Eguchi, 1965:287, fig.—Not Zou, 1988:76, pl. 5: figs. 10, 11.

REDESCRIPTION OF FIGURED SYNTYPE (ZMA Coel. 1307).—Corallum robust and dense, 20.1 × 15.6 mm in calicular diameter, and 21.9 mm in height, with a pedicel diameter of 11.8 mm (PD:GCD = 0.59). Theca worn and encrusted, but near calice costae are flat and equal in width (about 1 mm), covered with very small granules 5–6 across the width of a costa. Intercostal striae thin and shallow. Corallum light brown. Septa arranged in 13 half-systems accordingly: 13:13:26:4 (56 septa). The other, slightly larger (GCD = 20.6 mm) syntype (ZMA 1089) has 82 septa, but its symmetry is obscured by the polyp. Eleven of the half-systems are composed of two thick bordering primary septa, a secondary septum, and a pair of tertiary septa, whereas 2 of the half-systems also have a pair of quateraries. Primary septa only slightly exsert (about 1.8 mm) and have straight, entire inner edges, each bordered by a thick palus 1–2 mm wide that is adjacent to the columella. Secondary and tertiary septa only slightly less exsert than primary septa (about 1.6 mm), the secondaries about 80% width of a primary and also bordered by a palar crown, each P2 standing taller in the fossa and frequently divided into 2–4 subelements. Tertiary septa of about the same width as secondaries but much less thick. All septa closely spaced and covered with prominent ridge-like granules, the orientation of the ridges parallel to the septal edges. Palar faces also prominently ridged. Fossa shallow, containing a large elliptical and slightly convex papillose columella composed of about 25 elements.
license
cc-by-nc-sa-3.0
bibliographic citation
Cairns, Stephen D. 1994. "Scleractinia of the temperate North Pacific." Smithsonian Contributions to Zoology. i-150. https://doi.org/10.5479/si.00810282.557.i

Biology

provided by World Register of Marine Species
azooxanthellate
license
cc-by-4.0
copyright
WoRMS Editorial Board
bibliographic citation
van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO).
contributor
Jacob van der Land [email]
contributor
Jacob van der Land [email]

Depth range

provided by World Register of Marine Species
150 m
license
cc-by-4.0
copyright
WoRMS Editorial Board
bibliographic citation
van der Land, J. (ed). (2008). UNESCO-IOC Register of Marine Organisms (URMO).
contributor
Stephen Cairns [email]
contributor
Stephen Cairns [email]