"The calanoid family Arietellidae is widely distributed, occurring from littoral caves to the shallow water pelagic realm and deep-sea hyperbenthic layers (Ohtsuka et al. 1993, 1994). Phylogenetic analysis of the family pointed to the existence of two clades, viz. Crassarietellus-Paramisophria-Metacalanus-Pilarella (Metacalanus-clade) and Campaneria-Scutogerulus-Paraugaptilus-Paraugaptiloides-Arietellus-Sarsarietellus (Arietellus-clade) (Ohtsuka et al. 1994)" (from:Komeda et al., 2021)

ARIETELLUS Giesbrecht, 1893

HYPERBIONYX Ohtsuka, Roe & Boxshall, 1993

Andronov (1974) established the superfamily Ryocalanoidea for the monotypic family Ryocalanidae based on Ryocalanus infelix Tanaka, 1956 introduced by Tanaka (1956) after a single male specimen. Family Ryocalanidae are distributed in both, northern and southern hemispheres (Tanaka 1956; Andronov 1992; Markhaseva & Ferrari 1996; Shimode et al. 2000; Kosobokova et al. 2011; Renz et al. 2012) and species have been described from the Southern Ocean and South Atlantic, the central tropical Atlantic, the Arctic, the eastern tropical Pacific, the Izu region and Sagami Bay, Japan

RYOCALANUS Tanaka, 1956

"Family Lucicutiidae Sars, 1902 consisting of one genus Lucicutia Giesbrecht, 1898 was initially considered a subfamily Centropagidae Giesbrecht, 1893, but was later established into a family by Sars (1902). The genus Lucicutia was first established as Leuckartia by Claus (1863), but was replaced by Lucicutia by Giesbrecht (1898, in Giesbrecht and Schmeil, 1898). Wilson (1924) replaced Leuckartia with the generic name Rudolfia Wilson, 1924. Isochaeta Giesbrecht, 1889 became a synonym for Lucicutia by Grice (1963). Later, Hulsemann (1989) proposed removing Isochaeta and preserving Lucicutia" (Lee et al., 2024) LUCICUTIA Giesbrecht, 1898 (syn.Isochaeta Giesbrecht, 1889; Leuckartia Claus, 1863; Rudolfia Wilson C.B., 1924)

LEUCKARTIA Claus, 1863 (syn. Rudolfia Wilson C.B., 1924 )

RUDOLFIA Wilson C.B., 1924 (syn. Lucicutia Giesbrecht, 1898)