A new genus in the sub-family Semperiellinae is described: Triasemperia O Loughlin. Six new species of dendrochirotids are described with O Loughlin as author: Actinocucumis solanderi, Cladolabes arafurus, Globosita elnazae, Massinium bonapartum, Massinium keesingi, Triasemperia stola. Genera Actinocucumis Ludwig, Cladolabes Brandt, Globosita Cherbonnier and Massinium Samyn and Thandar are discussed. Species listed by Heding and Panning as synonyms of Actinocucumis typica Ludwig are raised out of synonymy: Actinocucumis cornus (Heding); Actinocucumis difficilis Bell; Actinocucumis longipedes Clark; Pseudocucumis quinquangularis Sluiter; Actinocucumis simplex (Sluiter). Actinocucumis donnani Pearson is incertae sedis. We provide a table of some distinguishing morphological characters for species of Globosita, and a key for distinguishing the species of Massinium.