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 Subfamily Hygrosomatinae Smith and Wright, 1990 Diagnosis. Echinothuriidae with pores on oral surface arranged in single series placed near adradial margin of ambulacral plates. Hoofs of oral spines conspicuously large and conical (emended from Fell 1966). Remarks. The subfamily Hygrosomatinae is limited to a single genus, Hygrosoma .