Actinernus Verrill, 1879

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 : 6

Genus Actinernus Verrill, 1879

DIAGNOSIS (modified from Carlgren, 1949; Uchida, 2007; modifications in bold): Actinernidae with thick column distally expanded, usually forming eight lobes. No marginal sphincter musculature. Tentacles, except youngest and rarely inner ones, with aboral thickenings of varying development that may run up the tentacles almost to their tips. Arrangement of tentacles usually in two cycles, largest tentacles at apices of lobes. Longitudinal muscles of tentacles ectodermal, weak, radial muscles of oral disc ectodermal. Two well-developed siphonoglyphs. Numerous perfect mesenteries; after the first 10 pairs (first and second cycles), mesenteries appear bilaterally in the middle point of each of the eight lateral endoceles, and are unequally developed. Retractors and parietobasilar musculatures weak. Cnidom: Spirocysts, basitrichs, b -mastigophores, p -mastigophores A.

TYPE SPECIES: Actinernus nobilis Verrill, 1879 , by original designation.

VALID SPECIES: Actinernus . antarcticus ( Carlgren, 1918) ; A. elongatus ( Hertwig, 1882) ; A. michaelsarsi Carlgren, 1918 ; A. nobilis ; A. robustus ( Hertwig, 1882) (Rodríguez and López- González, 2013).