Figure 2. a in A new fissiparous micro-asteriid from southern Australia (Echinodermata: Asteroidea: Asteriidae)

Figure 2. a. Allostichaster palmula sp. nov. (NMV F113585): abactinal view showing 2 typical inferomarginal spines (centre) with distinct stem, broad flat blade with vertical and radiating ribs, and coarsely serrate distal edge. b. Allostichaster polyplax (F73988): abactinal view showing clavate inferomarginal spines. c. Allostichaster palmula (NMV F113566): abactinal view of disc showing distally widened, coarsely spinous, spinelets, and small crossed pedicellaria (top). d. Allostichaster polyplax (F73988): abactinal view of proximal arm showing finely spinous globose and subcolumnar spinelets, and small crossed pedicellaria (top). e. Allostichaster palmula (NMV F113566): abactinal view of arm showing carinal series, papular spaces, and typical paddle-shaped inferomarginal spines (top). f. diagram showing typical skeletal plates of an arm of Allostichaster palmula: a, adambulacral; i, inferomarginal; s, superomarginal; p, papular space (shaded); c, carinal (proximal ray at top).