Amphianthus Hertwig, 1882

Gusmão, Luciana C. & Rodríguez, Estefanía, 2021, Deep-Sea Anemones (Cnidaria: Anthozoa: Actiniaria) From The South Atlantic, Bulletin of the American Museum of Natural History 2021 (444), pp. 1-73 : 32

Genus Amphianthus Hertwig, 1882

DIAGNOSIS (modified from Carlgren, 1949; modifications in bold): Amphianthidae with broad pedal disc, often elongated in transversal or sagittal plane. Column smooth or with small mesogleal papillae in longitudinal rows distally. Cinclides as a rule only on directive endoceles, few in number (1–3 or a few more?); external opening often on papillae; cinclides sometimes indistinct or absent. Mesogleal marginal sphincter musculature strong. Tentacles robust, always fewer than mesenteries at limbus, sometimes with mesogleal basal aboral thickenings. Longitudinal muscles of tentacles and radial musculature of oral disc ectodermal. One to three siphonoglyphs. Pairs of perfect mesenteries at least six, often irregular. One to three pairs of directives. Stronger mesenteries fertile except sometimes the directives. Retractors diffuse, usually fairly weak. Acon- tia well developed. Cnidom: spirocysts, basitrichs, p -mastigophores B1, and holotrichs.

TYPE SPECIES: Amphianthus bathybium Hertwig, 1882 , by original designation.

VALID SPECIES: Amphianthus armatus Carlgren, 1928a ; A. bathybium ; A. brunneus ( Pax, 1909) ; A. californicus Carlgren, 1936 ; A. capensis Carlgren, 1928a ; A. caribaeus ( Verrill, 1899) ; A. dohrnii ( Koch, 1878) ; A. ingolfi Carlgren, 1942 ; A. islandicus Carlgren, 1942 ; A. lacteus (McMurrich, 1893) ; A. laevis Carlgren, 1938 ; A. margaritaceus ( Danielssen, 1890) ; A. michaelsarsi Carlgren, 1934 ; A. minutus ( Hertwig, 1882) ; A. mirabilis ( Verrill, 1879) ; A. mopseae ( Danielssen, 1890) ; A. natalensis Carlgren, 1938 ; A. nitidus ( Verrill, 1899) ; A. norvegicus Carlgren, 1942 ; A. radiatus Carlgren, 1928a ; A. rosaceus Wassilieff, 1908 ; A. sanctaehelenae Carlgren, 1941a ; A. valdiviae Carlgren, 1928a ; A. verruculatus Carlgren, 1942 ( Fautin, 2016) .