Hapalosoma Mortensen, 1903 Type species: Asthenosoma pellucidum A. Agassiz, 1879, by original designation. Diagnosis —Like Araeosoma but smaller and lacking primary tubercles from admedian regions of aboral ambulacral and interambulacral plates. Blades of dactylous pedicellariae reduced to fine, gland-enveloped rods (emended from Fell 1966). Remarks —There are three assigned species, all Recent (Table 2).

Published as part of Anderson, Owen F., 2013, A review of New Zealand and southeast Australian echinothuriinids (Echinodermata: Echinothuriidae) with descriptions of seven new species, pp. 521-567 in Zootaxa 3609 (6) on page 559, DOI: 10.11646/zootaxa.3609.6.1, http://zenodo.org/record/219312