Morphological plasticity in the Aristotle's lantern of Arbacia dufresnii (Phymosomatoida
: Arbaciidae) off the Patagonian coast.
variolaris is the only living species in the family Stomopneustidae, order Phymosomatoida
, within the superorder Stirodonta along with arbacioid and salenioid echinoids (e.g., Smith 2005; Smith et al., 2006).
Family Phymosomatidae Genus Micropsis COTTEAU, 1856 Micropsis aff tremadesi COTTEAU P1.7, fig.3 1890 Micropsis tremadesi COTTEAU, p.96, PIXV/3-6 Material - 2 Samples Distribution - Aquitanian of Eidajti and Shurab.
The only evidence that bindin is present outside the Echinoida and Arbacioida comes from Moy and Vacquier (1979), who reported that an antibody to bindin of Strongylocentrotus purpuratus reacted with sperm from one species of the order Phymosomatoida
and two species of the order Clypeasteroida.