Primnoidae Duchassaing & Michelotti, 1864
- GBIF Backbone Taxonomy
Diagnosis. Colonies chiefly in one plane, with lax branching (dichotomous or pinnate-like); branches / branchlets tend to curve upwards; in some species, anastomoses possible (fan-like); in others, minimal branching or none. Polyps widely scattered, or crowded; often lateral or biserial, forming prominent conical or cylindrical mounds; on tips of branchlets, two polyps always opposed; conical anthostele seldom retracted; generally, polyps retractile. Anthocodiae commonly tall, exsert. Coenenchyme thin to moderate, somewhat rough / granular, outer layer filled not only with spinous rods or spindles, but with capstans having warts more or less conspicuously modified as double disks; some capstans quite foliate; inner layer mostly restricted to areas between longitudinal canals, containing only small capstans. Mound margins, base of tentacles, with numerous rows of conspicuous, stout spindles as bar-like rods, characteristic for species in the genus (fingerbiscuit shaped; see Bayer et al. 1983, pp 72 - 73, pl 19, figs 184 - 185). Axis is horny, flexible, somewhat flattened. Colony colors generally red, red-orange, pink or white.
Etymology. Deichmann (1936) stated that the definition of the genus Swiftia corresponded exactly with Stenogorgia Verrill, 1883; the problem discussed there stemmed from a misinterpretation of G. exserta Ellis & Solander, 1786 by Verrill (also by Kuekenthal 1924). See remarks, following.