A review of New Zealand and southeast Australian echinothurioids (Echinodermata: Echinothurioida) — excluding the subfamily Echinothuriinae — with a description of a new species of Tromikosoma Author Anderson, Owen F. text Zootaxa 2016 4092 4 451 488 journal article 51565 10.11646/zootaxa.4092.4.1 feeced25-b2a6-446d-9b38-a2289465a178 1175-5326 262655 EA66CAE5-F6CE-44BA-A5FF-67F2BEE6DEE8 Hygrosoma Mortensen, 1903 Type species: Phormosoma petersii A. Agassiz, 1880 , by original designation. Remarks. There are 3 assigned species, all Recent ( Table 5 ).