Annals of the South African MuseumAnnale van die Suid-Afrikaanse Museum . Fig. 7 Acrophytum claviger Hickson, 1900. A. Colony with exerted autozooids. B. Colonywith retracted autozooids. A-B. Scale bar = 30 mm. C. Detail of polyparium surface showingautozooids, siphonozooids, and sclerites; scale bar = 2 mm. D. Sclerites from the Sclerites from the stalk. D-E. Scale bar = 0,3 mm. Abbreviations: a—autozooid, s—siphonozooid, sc—sclerite. 270 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 8. Scanning electron micrographs of Acrophytum claviger Hickson, 1900. A-G. Clubsfrom the surface of
Annals of the South African MuseumAnnale van die Suid-Afrikaanse Museum . Fig. 7 Acrophytum claviger Hickson, 1900. A. Colony with exerted autozooids. B. Colonywith retracted autozooids. A-B. Scale bar = 30 mm. C. Detail of polyparium surface showingautozooids, siphonozooids, and sclerites; scale bar = 2 mm. D. Sclerites from the Sclerites from the stalk. D-E. Scale bar = 0,3 mm. Abbreviations: a—autozooid, s—siphonozooid, sc—sclerite. 270 ANNALS OF THE SOUTH AFRICAN MUSEUM. Fig. 8. Scanning electron micrographs of Acrophytum claviger Hickson, 1900. A-G. Clubsfrom the surface of the polyparium. A. 0,58 mm. B. 0,42 mm. C. 0,3 mm. D. 0,27 0,39 mm. F. 0,36 mm. G. 0,37 mm. H-I. Clubs from the surface of the stalk. H. 0,22 mm. I. 0,17 mm. SOFT CORALS OF SOUTHERN AFRICA 271 Dimorphism in smaller colonies of Acrophytum claviger is usually notapparent. It may be that siphonozooids are present only in large colonies, wheregreater facility of internal water circulation is needed, or that siphonozooidsdevelop in large breeding colonies only. Colonies less than 70 mm in length thatare apparently monomorphic are distinguished by the lack of non-retractilecalyces, sclerites that are clubs (<0,35 mm long) densely distributed in thesurface layer of the polyparium, and stalk and internal sclerites very sparse oraltogether absent. Genus Alcyonium Linnaeus, 1758 Alcyonium Linnaeus, 1758: 803. Tixier-Durivault, 1966: 28. Manuel, 1981: Kiikenthal,
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