Type species. Crypthelia pudica Milne Edwards & Haime, 1849
Included species. Crypthelia affinis Moseley; C. balia Hickson & England; C. boucheti Cairns; C. clausa Broch; C. cassiculata Cairns; C. crassa Cairns; C. crenata Cairns; C. cryptotrema Zibrowius; C. curvata Cairns; C. cymas Cairns; C. dactylopoma Cairns; C. defensa Cairns; C. eueides Cairns; C. deforgesi Cairns; C. floridana Cairns; C. formosa Cairns; C. fragilis Cairns; C. gigantea Fisher; C. glossopoma Cairns; C. glebulenta Cairns; C. ingens † Cairns; C. insolita Cairns; C. jenniferae Cairns; C. japonica (Milne Edwards & Haime); C. kelleyi Cairns; C. lacunosa Cairns; C. laevigata Cairns; C. medioatlantica Zibrowius & Cairns; C. micropoma Cairns; C. modesta Cairns; C. papillosa Cairns; C. parapolypoma Cairns; C. peircei Pourtalès; C. peteri Cairns; C. platypoma (Hickson & England); C. polypoma Cairns; C. pudica Milne Edwards & Haime; C. ramosa (Hickson & England); C. reticulata Cairns; C. robusta Cairns; C. sinuosa Cairns; C. spiralis Cairns; C. stenopoma (Hickson & England); C. tenuiseptata Cairns; C. trophostega Fisher; C. variegata Cairns; C. vascomarquesi Zibrowius & Cairns; C. viridis Cairns; C. vetusta † Wells; C. zibrowii † Cairns.
Distribution. Cosmopolitan, except for off continental Antarctica, 85–2789 m (see Cairns 2015). New record off Mar del Plata, 877–1398 m.
Diagnosis. See Cairns 2015.