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Introduction

The caryophylliids are known from the early Jurassic (about 180 million years ago) to the Recent, and are ubiquitous in today's oceans, from coastal Antarctica to the Arctic Circle, and from shallow water to 2165 m. Of the genera listed above, the last 10 are zooxanthellate and most of them are also shallow-water reef-builders. All of the other genera are, or are assumed to be, azooxanthellate, with one exception; however, at least four of those genera (Lophelia, Desmophyllum, Solenosmilia, and Goniocorella) produce the framework of deep-water coral banks at depths of 400-700 m (Cairns and Stanley, 1982, see figure below). The exception, Heterocyathus, contains species that are either zooxanthellate or azooxanthellate. Caryophylliids vary in size from a solitary corallum 4-5 mm in diameter (e.g., Caryophyllia rugosa) to large framework colonies of Solenosmilia, which may be a meter in diameter. This family represents an extremely diverse adaptive radiation, represented by 88 genera, 51 of them occurring in the Recent. Recent species number 296 (Cairns et al., 1999).

Distribution of known deep-water azooxanthellate coral banks produced by caryophyllids in the genera Lophelia, Desmophyllum, Solenosmilia, and Goniocorella (after Stanley & Cairns, 1988, copyright © 2002 S. D. Cairns).

Twenty-three (45%) of the 51 Recent genera are solitary in growth form, the remaining 28 genera being colonial. Twelve (24%) of the 50 genera are unattached (lying free on a soft or unconsolidated substrate), 36 are always attached to a hard substrate, and two genera contain species with both attached and free species. Whereas solitary species occur in the free and attached modes, all colonial species are attached. Two genera (Trochocyathus and Bourneotrochus) propagate by transverse division, and species of the genera Dasmosmilia and Aulocyathus most often reproduce by fragmentation. The species of one genus, Heterocyathus, have an obligate commensal relationship with a sipunculid; several genera are hosts for the galls of parasitic ascothoracidan Crustacea (Grygier and Zibrowius, 1985; Grygier, 1991); and one genus, Tethocyathus, is often the host of parasitic acrothoracican cirripeds (Cairns and Zibrowius, 1996).

The coralla of the some of the solitary caryophylliids are among the most beautiful designs in Nature, usually displaying an hexameral septal symmetry common to Scleractinia, and some species further ornamented with 6 or 12 elongate spines, edge crests, or elaborate costae. However, some species display a pentameral, octameral, or even decameral septal symmetry.

Left: Caryophyllia ambrosia: Calicular view of a skeleton collected from St. Christopher, Lesser Antilles (depth 622 m). Greater diameter of corallum 34 mm. This species represents caryophylliids having an unattached, solitary, cornute growth form, as well belonging to the first genus group. Copyright © 2002 S. D. Cairns. Right: Goniocorella dumosa: Skeleton of a colony collected from off Auckland Island, New Zealand (depth 421 m). Height of corallum 120 mm. This species represents those caryophylliids having an attached, colonial corallum, as well as belonging to the fourth genus group. Goniocorella dumosa is the predominant framework coral of deep-water coral banks in the temperate southwest Pacific Ocean. Photograph from Cairns, 1995, copyright © 1995 National Institute of Water & Atmospheric Research.

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